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• Dell inspiron not finding Vodafone router

  - by Jeggy

  I have a "Dell inspiron 1564" and ubuntu doesn't find my friends router it works great at home, he has a vodafone router jeggy@jeggy-XPS:~$ sudo lshw -C network *-network description: Wireless interface product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:04:00.0 logical name: eth1 version: 01 serial: 78:e4:00:2a:d1:eb width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=5.100.82.38 latency=0 multicast=yes wireless=IEEE 802.11bg resources: irq:17 memory:f0200000-f0203fff *-network description: Ethernet interface product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:05:00.0 logical name: eth0 version: 02 serial: b8:ac:6f:67:32:52 size: 10Mbit/s capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=N/A latency=0 link=no multicast=yes port=MII speed=10Mbit/s resources: irq:42 ioport:3000(size=256) memory:f0410000-f0410fff memory:f0400000-f040ffff memory:f0420000-f043ffff *-network description: Ethernet interface physical id: 4 logical name: ham0 serial: 7a:79:05:ff:3e:ec size: 10Mbit/s capabilities: ethernet physical configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full firmware=N/A ip=5.255.62.236 link=yes multicast=yes port=twisted pair speed=10Mbit/s

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• Ubuntu 3D does not work on Dell system with a AMD Radeon HD 6470M

  - by VeeKay

  I am running 64 bit Ubuntu on Dell with 1GB graphic card. I login with "Ubuntu" hoping to see Unity 3d but it doesn't. Unity 2D runs instead. when I type in echo "$DESKTOP_SESSION" it confirms the Unity-2D. I've checked the System info that shows like : The graphics row shows itself as empty. SO I've presumed that the graphic drivers aren't detected and hence I went to Unity- Additional Drivers and installed the fglrx driver that the UI has suggested. Even after installing so, the graphics part in System info details shows nothing and still Unity 2D runs in spite of all the effort. Please help! How can I get my Unity 3D back? Hardware Info Video Card : AMD Radeon™ HD 6470M - 1GB (For ICC) RAM : 6GB (1 X 2GB + 1 X 4GB) 2 DIMM DDR3 1333Mhz OS : 64 bit Ubuntu 11.10 Edit : Output for /usr/lib/nux/unity_support_test -p X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 155 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 21 Current serial number in output stream: 21

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• Dell Vostro 3560 bluetooth doesn't work

  - by Shein

  I installed the wireless driver using this instruction How do I install BCM43142 wireless drivers for Dell Vostro 3460/3560 and I have WiFi working. No problems here. But unfortunately the bluetooth doesn't work. The ubuntu bar shows the bluetooth sign and I can turn the bluetooth on/off but I can't discover any devices. And I can't find my laptop when I turn visibility On. So, obviously bluetooth doesn't work. I couldn't find the reports that blutooth can actually work with this adapter in Ubuntu. So, my question is: Is there anyone with BCM43142 adapter that have bluetooth working? Thank You in advance. PS. Ubuntu 12.10 x64 Update: After some fiddling around with different drivers from different sources I managed to get bluetooth working. Not flawlessly but at least I can pair a device. Bluetooth started working after installation of this package bt-bcm43142-onereic_0.0+20111116somerville2_amd64.deb Originally I found this package on the disk with Ubuntu which came with the Laptop. What this package does, it installs a firmware loader and a firmware itself. This firmware needs to get bluetooth working. Still bluetooth sometimes doesn't work even with this package. But manual loading the firmware helps. brcm_patchram_plus_usb --patchram /lib/firmware/BCM43142A0_001.001.011.0028.0036.hcd hci0 Also I found it strange that this package writes all different ids into /sys/bus/usb/drivers/btusb/new_id because only one from the list matches my device ID bcm43142.conf: install btusb /sbin/modprobe --ignore-install btusb && echo '0a5c 21d3' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21d7' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21e1' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21e3' > /sys/bus/usb/drivers/btusb/new_id && hciconfig hci0 up && /usr/bin/brcm_patchram_plus_usb --patchram /lib/firmware/BCM43142A0_001.001.011.0028.0036.hcd hci0 & My lsusb: ... Bus 002 Device 003: ID 0a5c:21d7 Broadcom Corp. In conclusion: bluetooth works not nearly as good as in windows :( once I even got a complete crash of the system because of the btusb module. Luckily WiFi works perfectly :)

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• DELL Inspiron 9400 SD Card Reader not working on 10.11 ubuntu

  - by Mario Martz

  Im new in linux, just installed Ubuntu 11.10 in a Dell Inspiron 9400, everything works fine with the exception of the SD card reader, everytime I insert a card the computer doesnt do anything, its like the SD card reader is not there. I did a $lspci and it shows the next drivers 03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller 03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19) 03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a) 03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05) Everytime I insert a memory card, dmesg shows the next d status 0x600b00 [ 2687.227351] end_request: I/O error, dev mmcblk0, sector 64 [ 2687.229436] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.229440] end_request: I/O error, dev mmcblk0, sector 65 [ 2687.230512] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.230515] end_request: I/O error, dev mmcblk0, sector 66 [ 2687.231588] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.231592] end_request: I/O error, dev mmcblk0, sector 67 [ 2687.232674] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.232678] end_request: I/O error, dev mmcblk0, sector 68 [ 2687.234763] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.234766] end_request: I/O error, dev mmcblk0, sector 69 [ 2687.236864] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.236868] end_request: I/O error, dev mmcblk0, sector 70 [ 2687.238942] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.238946] end_request: I/O error, dev mmcblk0, sector 71 [ 2687.238949] Buffer I/O error on device mmcblk0, logical block 8 [ 2687.241028] mmcblk0: retrying using single block read [ 2687.243104] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.243108] end_request: I/O error, dev mmcblk0, sector 64 [ 2687.245212] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.245215] end_request: I/O error, dev mmcblk0, sector 65 [ 2687.247298] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.247302] end_request: I/O error, dev mmcblk0, sector 66 [ 2687.248389] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.248393] end_request: I/O error, dev mmcblk0, sector 67 [ 2687.250476] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.250480] end_request: I/O error, dev mmcblk0, sector 68 [ 2687.252617] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.252621] end_request: I/O error, dev mmcblk0, sector 69 [ 2687.254737] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 and more of the same but with different sector number Im using Kernel 3.0.0-12-generic By the way, when I was installing it and ubuntu asks about installation (If I want to install it along with windows or delete something or change the partitions of the HDD) if I go to the window to change the partition of the disc, linux detects the SD Card (if there's one inserted course). Any help with this it would be appreciated -sorry for my english Thank you

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• Can the Dell PowerEdge T320 boot from a USB stick in hard drive emulation mode?

  - by Icydog

  I am trying to install FreeNAS on a Dell PowerEdge T320. I've followed the instructions here (http://doc.freenas.org/index.php/Burning_an_IMG_File) to write the .img file to four different USB sticks with dd if=FreeNAS-9.2.1.5-RELEASE-x64.img of=/dev/sde, but I can't boot off of any of them. When I try to boot, I get the following screen: F1 FreeBSD F2 FreeBSD F3 Drive 0 Then it auto-selects F1 and either prints # about once a second forever, or it sits with a blinking cursor doing nothing. Forum posts and the wiki page linked above say to set the USB boot emulation mode to hard disk (as opposed to auto or CD/DVD/floppy), and older Dell PowerEdge models including the T310 have this option in the BIOS settings, but I cannot find it on the T320 with the latest BIOS 2.1.2. I have even tried writing the USB image to a USB hard disk, but with the same lack of success. Has anyone been able to find this USB boot setting on a T320, or been able to boot FreeNAS/FreeBSD from USB in some other way on a T320?

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• Is Dell's server software bundle necessary? (Poweredge 2950 in my case)

  - by bwerks

  Hi all, Dell includes a fair amount of software with its servers, but I'm having a hard time determining from the documentation what each of them does, and whether or not I should install it. Dell's support site (unless I'm doing it wrong) seems fairly opaque to me and its offerings fairly unstandardized in terms of their usage, so if possible I'd like to stray away from them. Specifically, I'm curious if any of the features offered are duplicated in something like Microsoft System Center. For additional background information, I'm working with a Poweredge 2950 that was just rebuilt with an expanded raid-6, but initially I just installed Server 2008 R2 directly instead of using the Build and Update utility. There's nothing of use on it at the moment so I'm totally open to wiping it again.

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• Installing ubuntu server as linux distro on dell server - what drivers will be missed

  - by Cookie

  Dell (via USC) unpacks specific drivers for both RedHat and Suse to use after installation on its servers. As Ubuntu server isn't officially supported, this clearly isn't happening for Ubuntu. Is Ubuntu server then running with native drivers? In that case, which drivers are native with Ubuntu, and aren't (e.g. are Dell replaced) with RedHat/Suse? Are dell optimized drivers available for Ubuntu somewhere? Can the ones for RedHat or Suse be used with Ubuntu? Are there disadvantages of this lack of fine-tuned drivers, and if yes, what are they? Would they make the switch (and extra costs, as both RedHat and Suse Enterprise aren't cheap) away from the free Ubuntu server worthwhile? Dell recommends Canonical's commercial support for Ubuntu server on its machines, is this recommendable? Do they offer fine-tuned Dell drivers to replace native drivers?

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• Getting access to physical drives in ESXi v5.5 installation on Dell PowerEdge R710 with PERC 6/i

  - by Big-Blue

  I've acquired a Dell PowerEdge R710 server a few days ago, which includes a PERC 6/i RAID controller. The server is now fitted with a SATA SSD, one SAS drive and four SATA HDD's, all of which I would like to be passed through to ESXi in an "as-is" state, without creating any logical drives in the RAID controller. Now, the ESXi v5.5 installation image I grabbed from the Dell homepage starts just fine but only lists the logical drives and connected flash drives as possible installation targets, not any of the physical drives. If I create a small logical drive on my SSD (which the PERC 6/i detects as SATA-SSD type), the ESXi install wizard lists the SSD value on that drive as false; which is far from optimal. I have also tried disabling the RAID controller entirely in the setup, but that also did not help. Everything that should enable passthrough is enabled in BIOS, but that shouldn't be a concern at this early stage of the ESXi installation. How would I be able to install ESXi v5.5 to a part of my SSD that is connected to the storage controller, while giving it entire physical access to the disk (to allow for SMART values to be read etc.)?

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• BCM 4306 not recognized after upgrade on a Dell Latitude D600

  - by Brian Eisemann

  This is extremely frustrating to me. I had the wireless card working before I upgraded to 11.10. At first the wireless device was recognized but it told me there was no firmware, so I went ahead and went through the process I did before of installing the b43/b43legacy firmware, and now my wireless device is not even recognized, or showing up anywhere! 02:03.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11a/b/g [14e4:4324] (rev 03)

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• Overheating on Dell Studio XPS 1645

  - by pjtatlow

  So I was wondering if anyone else has come upon this problem, and/or has come up with a solution. When I use my Ubuntu partition, my computer becomes extremely hot, and the fan runs very noisily for a very long time. If I reboot into windows while this is happening, my computer actually begins to cool down while doing the exact same tasks. Thinking this might just be a bug with Ubuntu, I installed fedora on another partition, and the same problem occurs. Is this a problem with the kernel? Cpufreq tells me that my CPU is running at 933 MHz out of a possible 1.6 GHz from my Intel Core i7 CPU Q70. For anyone who wants more information, I have 8 GB of memory, and an ATI Mobility Raedon HD 5730 Graphics Card. I'm open to any ideas anyone might have. Thanks in advance!

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• Ubuntu 13.10 and Dell Inspiron 7520 SE (Intel 4000 and ATI radeon HD 7730m)

  - by pjgowtham

  I installed 13.10 and i have problems with my display. Everything else works fine. I cant control my brightness. I thought the graphics driver is the problem. So i went to software updates, switched to another driver (proprietary) and the Ubuntu screen went black and i wasn't able to boot either. I cant use my lap with such low brightness. Then i reinstalled 13.10 again, This time full hdd reset. Same problem occurred. I grabbed radeon hd7730m for Linux x64 from the amd site, installed it, and the screen went black with only the "x" cursor showing on the next boot. What should i need to do to make my brightness work and stabilize graphic cards as mine is switchable graphics type.

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• Dell wireless not working after upgrade

  - by Omer Saeed

  So, the short version of my sad story is that I tried upgrade Ubuntu to 12.04 and wireless driver has stopped working. I have tried all the solutions but nothing seem to be working. When I try to install my wireless from "Additional Drivers" Its says: Sorry, installation of this driver failed. Please have a look at the log file for details: /var/log/jockey.log The lspci command gives me the following info about wireless: 0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01) I have tried removing bcm drivers and reinstalling, but nothing seems to be working. rfkill is good too.

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• ubuntu 14 painfully slow on dell r200

  - by sirmonkey

  I didn't notice it at first. The machines (there is 20 plus) are to be used a simple file servers. It wasn't until samba just wouldn't act right that I installed a desktop gui and started more diagnoseing the problem did I catch the slow preformance... I've tested 4 servers they all suck. And windows 7 runs fantastic on them. I have Google and searched. But nothing to explain this. The easy test is dmesg is so slow you can almost read it. I'm guessing it's an apic or cpu power management issue. What output would you all like????? It is a core2 machine with 4Gb of ram. On board data.

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• Ethernet not working on a Dell Inspiron 14z

  - by Izabela

  When I plug in a network cable, it is not recognized. The WI-FI is working properly, though. ifconfig output: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1645 errors:0 dropped:0 overruns:0 frame:0 TX packets:1645 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:206840 (206.8 KB) TX bytes:206840 (206.8 KB) wlan0 Link encap:Ethernet HWaddr e0:06:e6:de:57:e7 inet addr:150.164.201.145 Bcast:150.164.201.255 Mask:255.255.255.0 inet6 addr: 2001:12f0:601:a921:98a2:3dd:3be8:c483/64 Scope:Global inet6 addr: 2001:12f0:601:a921:e206:e6ff:fede:57e7/64 Scope:Global inet6 addr: fe80::e206:e6ff:fede:57e7/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:23892 errors:0 dropped:0 overruns:0 frame:0 TX packets:14676 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:30123226 (30.1 MB) TX bytes:2189050 (2.1 MB)

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• Ethernet not working in 12.04 (Dell Inspiron 14z)

  - by Izabela

  When I plug in a network cable, it is not recognized. The WI-FI is working properly, though. ifconfig output: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1645 errors:0 dropped:0 overruns:0 frame:0 TX packets:1645 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:206840 (206.8 KB) TX bytes:206840 (206.8 KB) wlan0 Link encap:Ethernet HWaddr e0:06:e6:de:57:e7 inet addr:150.164.201.145 Bcast:150.164.201.255 Mask:255.255.255.0 inet6 addr: 2001:12f0:601:a921:98a2:3dd:3be8:c483/64 Scope:Global inet6 addr: 2001:12f0:601:a921:e206:e6ff:fede:57e7/64 Scope:Global inet6 addr: fe80::e206:e6ff:fede:57e7/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:23892 errors:0 dropped:0 overruns:0 frame:0 TX packets:14676 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:30123226 (30.1 MB) TX bytes:2189050 (2.1 MB)

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• Dell Vostro 1510 trackpad

  - by user18055

  A week ago I moved totally from Windows 7 to Ubuntu. I've been really happy with the transition bar one annoying glitch. My trackpad sometimes works, sometimes doesn't. All other hardware including peripherals work flawlessly, including a Logitech ball mouse, Wacom Bamboo pen and touch and wireless Logitech keyboard and mouse combo. I can't see any pattern to when and why the trackpad works. Occasionally on rebooting, it will work, but then I can reboot 10x in a row and it won't work, then I leave it a day, then reboot and it works flawlessly. Any ideas on a solution or appropriate method for me to deb it? My knowledge of Ubuntu/Linux is sketchy at best so I could do with a little help :)

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• huwai 1731 ( mobile broadband ) not working with dell inspiron 3521

  - by N.Ramkumar

  Please help, one of my friend shared this note ( enclosed below), I used these codes and my laptop is able open the data card but I am not getting any signals. I am able to work with wired connection, but wi-fi and mobile broad band are not working. Please help. sudo apt-get purge usb-modeswitch sudo apt-get update sudo spt-get install usb-modeswitch sudo apt-get update gksudo gedit /lib/udev/rules.d/40-usb_modeswitch.rules Once you enter these above commands 40-usb_modeswitch.rules text file will open. Then, copy below mentioned lines into 40-usb_modeswitch.rules text file. #Huawei E1731 ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1446", RUN+="usb_modeswitch '%b/%k'" Save the file Then type : sudo apt-get update Then restart the machine.

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• Dell Mini 10 Mouse Pad Problems

  - by MetaDark

  After going from 10.04 - 10.10 (not upgraded, completely reinstalled because of upgrade issues) I found a weird problem with my mouse pad. Whenever I clicked on the left or right mouse buttons (integrated into the touch pad) when I released them, it seemed like it was detecting a double click and ended up choosing the option the mouse was hovering over. Has anyone else experienced issues like this, and if it is possible, could I fix it?

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• 3rd monitor with Dell Precision 490

  - by Animesh Kumar

  I am trying to go for a 3 monitor setup on my workstation, but need some information before I can invest in a new graphics card and 2 monitors. Would be glad to get some help here: I have a Dell Precision 490 workstation with Nvidia Quadro FX 4500 graphics card (PCI-E 16) on it. It has 2 DVI-D ports that can support 2 monitors upto 2560x1600 resolution. For the third monitor, I was looking at Nvidia NVS 295 card, however I am not sure if it is physically possible to hook another card to the motherboard. Here is the spec of Precision 490: http://www.dell.com/downloads/global/products/precn/en/spec_precn_490_en.pdf Can I attach NVS 295 to it? If not, what options do I have?

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• How to flash Dell Precision 390 from linux (debian)

  - by malat

  I am trying to update my BIOS: $ sudo dmidecode -s bios-version 2.1.2 With a newer one: 2.6.0. I went to this page Dell Precision System BIOS, 2.6.0 After downloading the file WS390-020600.BIN, here is what it states: $ ./WS390-020600.BIN --help Usage: WS390-020600.BIN [options] Options: --help Print this text. --version Print package versions. If no options, update the BIOS. and $ ./WS390-020600.BIN --version Dell BIOS Update Installer 1.2 Copyright 2006 Dell Inc. All Rights Reserved. ./WS390-020600.BIN: 60: ./WS390-020600.BIN: ./flash: not found Does anyone knows where this flash command can be found ? Update: it looks like this is a self-extracting archive (need bash as per comment in header). $ head -30 WS390-020600.BIN [...] Extract() { tail -n +`awk '/^__ARC__/ { print NR + 1; exit 0; }' $0` $0 | gzip -cd >$_PRG So the flash command should have been auto-generated, however the above command does not appear to be running as original author intended. I do not see anything wrong with the command though.

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• Required Working Precision for the BBP Algorithm?

  - by brainfsck

  Hello, I'm looking to compute the nth digit of Pi in a low-memory environment. As I don't have decimals available to me, this integer-only BBP algorithm in Python has been a great starting point. I only need to calculate one digit of Pi at a time. How can I determine the lowest I can set D, the "number of digits of working precision"? D=4 gives me many correct digits, but a few digits will be off by one. For example, computing digit 393 with precision of 4 gives me 0xafda, from which I extract the digit 0xa. However, the correct digit is 0xb. No matter how high I set D, it seems that testing a sufficient number of digits finds an one where the formula returns an incorrect value. I've tried upping the precision when the digit is "close" to another, e.g. 0x3fff or 0x1000, but cannot find any good definition of "close"; for instance, calculating at digit 9798 gives me 0xcde6 , which is not very close to 0xd000, but the correct digit is 0xd. Can anyone help me figure out how much working precision is needed to calculate a given digit using this algorithm? Thank you,

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• Find max integer size that a floating point type can handle without loss of precision

  - by Checkers

  Double has range more than a 64-bit integer, but its precision is less dues to its representation (since double is 64-bit as well, it can't fit more actual values). So, when representing larger integers, you start to lose precision in the integer part. #include <boost/cstdint.hpp> #include <limits> template<typename T, typename TFloat> void maxint_to_double() { T i = std::numeric_limits<T>::max(); TFloat d = i; std::cout << std::fixed << i << std::endl << d << std::endl; } int main() { maxint_to_double<int, double>(); maxint_to_double<boost::intmax_t, double>(); maxint_to_double<int, float>(); return 0; } This prints: 2147483647 2147483647.000000 9223372036854775807 9223372036854775800.000000 2147483647 2147483648.000000 Note how max int can fit into a double without loss of precision and boost::intmax_t (64-bit in this case) cannot. float can't even hold an int. Now, the question: is there a way in C++ to check if the entire range of a given integer type can fit into a loating point type without loss of precision? Preferably, it would be a compile-time check that can be used in a static assertion, and would not involve enumerating the constants the compiler should know or can compute.

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• BigDecimal precision not persisted with javax.persistence annotations

  - by dkaczynski

  I am using the javax.persistence API and Hibernate to create annotations and persist entities and their attributes in an Oracle 11g Express database. I have the following attribute in an entity: @Column(precision = 12, scale = 9) private BigDecimal weightedScore; The goal is to persist a decimal value with a maximum of 12 digits and a maximum of 9 of those digits to the right of the decimal place. After calculating the weightedScore, the result is 0.1234, but once I commit the entity with the Oracle database, the value displays as 0.12. I can see this by either by using an EntityManager object to query the entry or by viewing it directly in the Oracle Application Express (Apex) interface in a web browser. How should I annotate my BigDecimal attribute so that the precision is persisted correctly? Note: We use an in-memory HSQL database to run our unit tests, and it does not experience the issue with the lack of precision, with or without the @Column annotation.

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• negative precision values in ostream

  - by daz-fuller

  This is more of a question of curiosity but does anyone know how negative precision values are handled in C++? For example: double pi = 3.14159265; cout.precision(-10); cout.setf(ios::fixed, ios::floatfield); cout << pi << endl; I've tried this out and using GCC and it seems that the precision value is ignored but I was curious if there is some official line on what happens in this situation.

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• Dell Inspiron 1564 overheating but fan not switching on, how to diagnose?

  - by Smugrik

  I've got a Dell Inspiron 1564 laptop that is about one and a half years old. Since about a week, the laptop started to overheat, causing it to switch off unexpectedly... The cpu fan is working erratically, it can start to spin for a while, doing its job and cooling down the cpu before it stops, but then the temperature goes up, and the fan doesn't reacts, once the temperature reaches a critical point (over 85 celsius, checked with speedfan...), the laptop switches off... I already cleaned the vents and fan from dust, to no avail, and it was actually quite clean anyway. Drivers and bios are up-to-date, no crapware was ever installed on this machine. I don't know how to diagnose the problem, could it be the temperature sensors that sends wrong information, so the fan doesn't reacts? but then I believe the computer wouldn't detect the overheat and stop... Is there a way I can pin point the problem? Maybe some low-level diagnostic tools to check functionality of sensors and fans??? The warranty is already over so any suggestion would be welcome. Thanks!!

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