Why does Ubuntu reset brightness settings at the loading screen?
- by leugim
Since I first installed Ubuntu 11.10, I noticed that volume and screen brightness get reset every time Ubuntu starts.
Why is this so? And what ways are there to keep brightness and volume levels after rebooting?
I have found some scripts that change the screen-brightness at login. But this is not a good solution since
login is slower because it seems to wait until the screen brightness is at the level specified by the script. After entering the password I see the screen brightness go down gradually. Only after this is complete (~1 or 2 seconds) does the background disappear and Unity come up.
The screenbrightness is not remembered but instead redefined at login. So it gets remembered for the first part of the boot, then set to MAX and then again re-set to normal value by the script. My boot process is as follows:
desired brightness: 2 (13,33%) / Max brightness: 15 (100%)
Bios / brightness: OK
GRUB (violet background color, white text) / brightness: OK
Ubuntu loading screen with the dots / brightness: MAX (win7 loads with OK-brightness)
User Login / brightness: MAX
Unity starts / brightness: OK
It seems to be more like a temporary patch than a actual solution.
I'm looking for solutions that set the desired brightness permanently and consistently throughout the whole boot-process
After updating to 12.04 the behavior is the same.
I tried
setpci -s 02:00.0 F4.B=XX
The value of F4.B is always '0' regardless of what value I try to set it to (tried 0, ff, f, 5, etc)
The solution in this answer does not have any noticeable effect: Desktop doesn't remember brightness settings after a reboot
The variables at /sys/class/backlight/acpi_video0/ get changed if I use Fn+UP and Fn+DOWN
Any help is appreciated. Thanks!
