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• Force gdm login screen to the primary monitor

  - by Kirill

  I have two monitors attached to my video card. Primary monitor has a resolution equal to 1280x1024 and the second has 1920x1200. My gdm login screen always appears on the second monitor even if it is switched off. My question is how to force gdm to show the login screen always on the primary monitor with resolution 1280x1024? I use Nvidia GT9500 videcard in Twinview mode. I can't use Xinerama because vpdau doesn't work correclty in this mode. What I have found is that mouse pointer always appears in the center of union of the screens and center is always on the monitor with higher resolution. Login screen always shows where mouse cursor is. Now my primary monitor has a resolution equal to 1920x1080. The problem still persists, mouse cursor always appears in the right-bottom corner of the second monitor.

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• Determine percentage of screen covered by an object without using frustum culling

  - by Meltac

  On the CPU-side of an 3D first-person / ego perspective game I need to check whether what the players currently sees on screen is the inside of a box object defined by world space coordinates (the player might be outside of that box but on screen sees only/mostly the inside of the box, or vice-versa, looks from within the box to the outside). The "casual" way of performing such a check would incorporate frustum culling but such an approach would be hard to achieve with my given set of engine parameters which I'd like to avoid if there is a simpler way. What I actually have at the point where I would like to do the check (high-level script on CPU, not GPU side): Camera world position Camera direction Camera FOV Two Box corner world coordinates (left-bottom-front, right-top-back) What I do not have right away: View frustrum definition (near/far plane or say 6 planes defining frustum) Any specific pixel information (uv, view space position, depth or the like) What I would like to calculate: Percentage of screen "covered" by box. Any hints on how to perform such calculation?

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• Virtual screen size with libgdx and GLES 2

  - by David Saltares Márquez

  I've been trying to use a virtual screen size for my libgdx desktop-android game. I'd like to always use a 16:9 aspect ratio but with a virtual screen size so everything would adapt automatically depending on the device size. This post illustrates the process pretty well but my game crashes when camera.apply(Gdx.Gl10) is called. This is because I'm using GLES 2.0 (for not having to use multiple of 2 texture sizes). As stated in the OrthographicCamera doc, the apply method only works with GLES 1 and GLES 1.1. Is there another way of applying my GL transformation to the camera so I can use a virtual screen resolution? Having to resize everything manually it's a total pain. Thanks a lot.

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• No lock screen when the right click menu is open

  - by Shivram

  I just found that the lock screen on my laptop does not show up when the right click menu is open. I discovered this when I pressed the right click button accidentally while closing the lid and the laptop went to sleep, but the lock screen never showed up when I opened the lid again. I am also not able to lock the system manually(with ctrl+alt+L) when the right click menu is open. Is this by design or is it a bug? I would assume that the screen should be locked automatically when the computer goes to sleep, but this doesn't seem to be the case. Anyone have any suggestions? My specs are: Dell Vostro 1500, Ubuntu 12.10

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• Hotkey to shut down from login screen?

  - by Skizz

  I used to run 9.04 on my server and used to be able to use Alt-T, Alt-S to shut the system down from the login screen. It was using a KDE login screen. Now I've upgraded to 10.04 and use the Gnome login screen and I can't see any keyboard shortcuts to shutdown the server. Is there a shortcut and if so, what is it? Further info - I would normally shut down the server without turning on the monitor, which was easy using the keyboard shortcuts. Doing it with a mouse is not so easy without the monitor being on.

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• White lock screen in Gnome 3.4

  - by kedmond

  I'm using Gnome 3.4 on Ubuntu 12.04. I've noticed that my lock screen is white. If I move the mouse, click, or begin typing my password, my wallpaper appears in the background with the password prompt window, as you'd expect. But I don't think the default lock screen is supposed to just be a white screen, is it? How do I fix this? I can't seem to find anyone else with this problem and I don't know what I need to reinstall or change. Thanks!

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• Screen dims on opening certain applications on Macbook

  - by yayu

  I have ubuntu 11.10 installed on an old 2008 macbook. There is an issue of screen dimming that I didnt find anywhere else on the forums. The issue is that the screen is dimmed when I open certain applications (Firefox, Software Center) and this cannot be readjusted by the physical brightness buttons on the keyboard. I tried a bunch of things on the barely barely visible screen, and had no choice but to restart. This has happened everytime. Does anyone know how to solve this?

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• Can't get Past Login Screen -Graphics Drivers 12.10

  - by mchangun

  Newbie Linux user here. I just installed Ubuntu 12.10, dual booting with Windows 8 Preview Release Build 8400 on a Dell Precision 490 workstation with Nvidia Quandro NVS 55/280 PCI graphics card. I cannot login to Ubuntu - after entering my password and pressing enter, the screen graphics gets garbled for a few seconds, and then the screen goes black showing only the mouse cursor. I suspect it's something to do with my Graphics Card, everything on the GUI login screen feels very sluggish. I know what I have provided here doesn't give you much information, would appreciate it if I could get some guidance on how to provide more useful logs. Thank you.

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• Macbook Pro late 2011 screen brightness issue

  - by buchzumlesen

  The keys to set the screen brightness work properly but everytime I reboot, the screen brightness is reverted to 100%, which is very annoying. I've already tried to add the following lines to /etc/rc.local but with no success (only the keyboard backlight stays off): #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. echo '1' > /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness echo '6' > /sys/class/backlight/acpi_video0/brightness rfkill block bluetooth exit 0` This worked for me when I was using Ubuntu 12.04 and also did after the upgrade to 12.10 but then after rebooting the screen brightness always reverted to 100%. Would be nice if anyone knows how to fix this. My device: Macbook Pro 13" Late 2011 Thanks in advance!

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• HP Pavillion laptop screen problems

  - by Liealais Vards Nekas

  Approximately after 4 days when I installed my Ubuntu 10.10 an interesting problem with my laptop screen starts. I had similar problem what you can see in this video - http://www.youtube.com/watch?v=jCYVfGVGWyY&feature=related - but it doesn't happen all the time. The most interesting thing is that, than I had that problem only when I turn my laptop screen in different angle. And this "bad" angle changes by the time, so after about 15 minutes after booting computer I can turn laptop screen in normal position. This is software or hardware problem? I'm using HP Pavillion dv9000.

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• Intel GMA 4500M screen resolution problem

  - by I Heart Ubuntu

  I was previously running 10.10 on my Acer Aspire laptop. It has Intel GMA 4500M integrated graphics and worked just fine. Great display, sharp, crisp, etc. I decided to do a fresh install of 11.10 Oneiric and now am having problems. Originally I was getting the dreaded blank screen where the brightness was turned almost completely off. Some searching pulled up several easy fixes (editing GRUB). Right now I am still having one issue. The screen resolution is stuck at a max of 1024x768 giving me a distorted screen. Is there any way to fix this issue? I've Googled, searched Ask Ubuntu and also spent time on the forums looking for a solution. Thus far, nothing. Apparently, was and still is a concern in Natty? Any help would be greatly appreciated.

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• Hotkey to shut down Ubuntu 10.04 from login screen

  - by Skizz

  I used to run 9.04 on my server and used to be able to use Alt-T, Alt-S to shut the system down from the login screen. It was using a KDE login screen. Now I've upgraded to 10.04 and use the Gnome login screen and I can't see any keyboard shortcuts to shutdown the server. Is there a shortcut and if so, what is it? Further info - I would normally shut down the server without turning on the monitor, which was easy using the keyboard shortcuts. Doing it with a mouse is not so easy without the monitor being on.

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• Can't cancel the lubuntu shutdown screen

  - by user292040

  I've bought a small 5 year old small netbook. I noticed that lubuntu runs great on it, as it doesn't use much space/resources. But the problem is, my screen is just too small. Whenever I press the shutdown icon, I go to the shutdown, logout, restart, ect panel but the cancel button is tucked away right where my screen seems to end. I can't go back, it forces me to use an option besides canceling, which I can't reach with my mouse.Is there any way to change this so I get access to the whole screen. The rest seems to be showing just fine, like the launchbar, which is cleary visible and useable. Another thing that bugs me is that whenever I start up, I get an error along the lines of "conflict detected with stolen region". I read that it has something to do with graphics but I have no idea how to get rid of it. The error doesn't seems to cause any trouble as far as I can see, but it's annoying.

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• Unable to use separate X-Screen's GTX 550ti Ubuntu 12.10

  - by user12622

  I am currently trying to get from "Twin View" to using separate X screen's on Ubuntu 12.10, however I'm not having a great deal of luck. I am using an Nvidia GeForce GTX 550 Ti and am on driver version 304.51 Initially, when I turn on the separate X screens option, presents me on the 1 monitor with a box to accept the changes, however the 2nd screen goes black, and effectively, Ubuntu only seems to recognise the one screen. When I reboot, I boots back into Ubuntu with both screens working in Twinview. I'm not too sure where to start, but my xrandr can be found: Xrandr Any help is greatly appreciated, this is the last but one thing I need to make Ubuntu my only OS, so fingers crossed we can crack it :)

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• How do I prevent the Sleep button from locking the screen

  - by elmicha

  My keyboard has a Sleep button. I defined a shortcut in System Settings, Keyboard Shortcuts own settings (or similar), so that the Sleep buttons runs a script. That works. But since my upgrade to Oneiric, something also locks the screen (in the same way the screen is locked when I press Ctrl+Alt+L). Can I disable that behaviour? What's the name of that lock screen? I tried hiding gnome-screensaver and /etc/acpi/ and I looked in gconf-editor /apps/gnome-power-manager/buttons. I didn't find anything related in dconf-editor.

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• Screen Brightness Stuck on high on an HP dv7t laptop

  - by theJollySin

  I have an otherwise fully-functioning install of Ubuntu 12.04 on my HPdv7t laptop. When I press the 'brightness buttons' on the keyboard the associated images appear on my screen to say I am increasing/decreasing the screen brightness. When I go into "System Settings" I can move the 'brightness slider bar' up and down. But none of that changes the fact that my screen is stuck on the highest brightness setting. ANY clues on how to fix this would be greatly appreciated. This giant 17-inch monitor is blinding, and this is making it hard to code for any length of time.

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• How to Eliminate Black Bars from Powerpoint videos ?

  - by appu

  Hi, I am running a digital signage system for my client. The basic installation is a vertically oriented 42" LCD TV with a 1920x1080 screen resolution (reverse of 1920x1080 when setup normally, i.e. landscaped). Please check out the following link for a basic screen divisions layout I want to setup. http://flickr.com/photos/55097319@N03/5410208856 In the division labeled "ppt" I plan to run a powerpoint presentation. The screen division is 360x1476 resolution. As there isn't an option in powerpoint to specify slide size in terms of resolution so according to this article on indezine http://indezine.com/products/powerpoint/books/perfectmedicalpres02.html to get a screen resolution of my preference I divided 360 and 1476 each by 72 which gives me 5"x 20.5" as the slide size for my ppt. After setting up slide size as per above dimensions, I used sizer (http://brianapps.net) to resize my ppt window to 360x1476 so that when I record I do not get any black bars. But after launching recording there are side black bars visible which camtasia records and brings-inside cam studio with black bars. http://www.flickr.com/photos/55097319@N03/5409597049 My question is that after doing the above and as explained in the following video link why do I still get black bars. http://feedback.techsmith.com/techsmith/topics/eliminate_black_bars_in_your_powerpoint_recordings Is there an option in camtasia to stretch the recording to cover up black bars or any other alternative way I can get rid of those black bars while I get a ppt recorded as per my preferred dimensions. Notes: In the techsmith video above it asks to adjust my desktop screen resolution which my display chipset does not allow me to set. I set up show in powerpoint to be "browsed by an individual(window)". Also signage software only supports swf's and video file formats natively and not ppt, pptx etc. Thanks bhavani.

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• Screen Scraping - how to get AJAX based filtered data

  - by Muhammad Akhtar

  hi, I am working on screen scraping, its easy when filteration in query string, but the problem in AJAX based filteration, e.g. here is an sample URL When you open this page, enter hotel name and click Go, Ajax filter work and show the result accordingly or you click on Next Page, it will shown next record using AJAX based. please suggest me, how to handle these kind of issues when working in Screen Scraping? Thank alot

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• Problems with NVIDIA drivers: White screen with full(or almost full)screen apps

  - by Felipe

  My NVIDIA graphic card is a 7050/610i. My problem is that after upgrading to the last NVIDIA drivers when I use fullscreen apps (or almost fullscreen) the windows goes white. My xorg.conf file: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 270.29 ([email protected]) Wed Feb 23 16:38:34 PST 2011 Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" Option "AddARGBGLXVisuals" "True" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection Section "Module" Load "glx" EndSection Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" # generated from default EndSection Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Device" Identifier "Device0" VendorName "NVIDIA Corporation" Driver "nvidia" Option "NoLogo" "True" EndSection Any idea on how to solve this? <--Sorry for bad english, ask for more info--

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• Purple start screen - no splash screen

  - by Peter

  After installing Ubuntu 11.10 on a new computer everything worked fine for a few weeks and now suddenly when starting up Ubuntu I get a blank purple screen with no "ubuntu" splash and the 5 dots but the system does start up. What has happened to loose the ubuntu splash screen? Also, I've checked in the grub startup and it has "quiet splash" in the linux line. I have an ATI radeon 5450 graphics card which needed nomodeset to be added to the grub line when booting for the first time off the install CD but now this line has disappeared from the grub startup. Can anyone help. Thanks

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• Strange monitor issue - screen goes black after a few seconds

  - by Scott Szretter

  My LCD monitor display is going black (turning off). It's a Samsung SYncMaster 2233 widescreen. I am trying to figure out if there is anything I can do about it, or if the monitor is junk. I have tried multiple computers, all have the same issue. I have tried a different vga cable, same issue. Power and video cables are tight / double checked. When I power on the monitor, the blue light turns on at the bottom. Then a second or two later the video comes up as expected and it looks fine. However, about 2-3 seconds after that, the screen goes black. The blue light is still on and solid at the bottom (blue light normally flashes when the monitor is sleeping). If I power cycle the monitor, same thing happens. With no computer connected or when I unplug the vga cable, I see the searching for signal message "digital", then the screen goes black. However it usually shows "digital" then "analog" after that and switches between the two a few times. The buttons on the side do not do anything, although they may be, I just can not see if they are or not. I can usually get the "digital" message by pressing the buttons on the side, but then it quickly goes black again. What is really strange is sometimes I can get it to work fine. I am not sure what the difference is. Last week I connected it up and it worked fine and it stayed fine for at least a week! I did not turn it off or anything, I just let the OS put the display to sleep. Then this week one morning I started having the screen going black issue again. Seems like something is either loose inside or beginning to fail. Do you think there is any hope for it? update: pushing the input select button causes the "digital" and "analog" messages to flash on the screen, but only for a few seconds then it goes black. When it was working properly, those messages would flash back and fourth for probably 10-20 seconds then a message would show saying check input signal, but now just a black screen.

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• PHP Screen Scraping Class

  - by BRADINO

  After some positive feedback I have decided to continue to develop the PHP Screen Scraping class. This post will server as the permanent home for the class. Download PHP Screen Scraping Class Updates 20009-07-30 Added setHeader() function

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• screen DPI - is there and equivalent command/action to Windows 150% Display

  - by Yekhezkel Yovel

  I have a wide screen of high resolution and I see everything small on it. So In windows I set the display to 150%, I would like to do something similar in Ubuntu. Simply changing screen resolution to lower resolution doesn't help because Ubuntu is in a virtual machine and it simply changes the VM window to the actual resolution. Is there a command or a simple hack that can do the trick? EDIT: I am running Ubuntu as a VirtualBox VM on Windows 7 host.

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• Disable Cinnamon 2 lock screen?

  - by minerz029

  When my computer is locked, I am presented with the default Ubuntu lockscreen. When I enter my password and unlock it, I am presented with the Cinnamon 2 lock screen and I have to enter my password again. How can I disable the Cinnamon 2 lock screen? Note: I've installed Cinnamon 2 with these commands: sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable sudo apt-get update sudo apt-get install cinnamon

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• State / Screen management in Entity Component Systems

  - by David Lively

  My entity/component system is happily humming along and, despite some performance concerns I initially had, everything is working fine. However, I've realized that I missed a crucial point when starting this thing: how do you handle different screens? At the moment, I have a GameManager class which owns a component manager and entity manager. When I create an entity, the entity manager assigns it an ID and makes sure it's tracked. When I modify the components that are assigned to an entity. an UpdateEntity method is called, which alerts each of the systems that they may need to add or remove the entity from their respective entity lists. A problem with this is that the collection of entities operated on by each system is determined solely by the individual Systems, typically based on a "required component" filter. (An entity has to have a Renderable component to be rendered, for instance.) In this situation, I can't just keep collections of entities per screen and only Update/Draw those collections. They'd have to either be added and removed depending on their applicability to the current screen, which would cause their associated components to be removed, or enable/disable entities in a group per screen to hide what's not supposed to be visible. These approaches seem like really, really crappy kludges. What's a good way to handle this? A pretty straightforward way that comes to mind is to create a separate GameManager (which in my implementation owns all of the systems, entities, etc.) per screen, which means that everything outside of the device context would be duplicated. That's bothersome because some things are always visible, or I might want to continue to display the game under a translucent menu window. Another option would be to add a "layer" key to the GameManager class, which could be checked against a displayable layer stack held by the game manager. *System.Draw() would be called for each active layer, in the required order as determined by the stack. When the systems request an iterator for their respective entity collections, it would be pre-filtered to a (cached) set of those entities that participate in the active layer. Those collections could be updated from the same UpdateEntity event that's already used to maintain each system's entity collections. Still, kinda feels like a hack. If I've coded myself into a corner, feel free to throw tomatoes as long as they're labeled with a helpful suggestion. Hooray for learning curves.

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