Screen darkens during udev startup and X startup

Leye · 2009-05-10 12:19:57

Hi,

I think many other people have this issue also, and I haven't found any solution yet.

The problem is: Since a kernel upgrade (I reckon), everytime udev starts during boot, my screen becomes unreadable dark. This also happens during X startup. My graphic card/chip is an Intel Extreme GM965. Perhaps these are 2 different issues, the one because of udev, and the other because of X/intel-dri, all I remember is that I haven't had this problem before kernel and X upgraded.

This doesn't happen on Ubuntu (just for comparison). I wonder if I can solve this by compiling an own kernel with certain options that were dropped with the newer kernels. Does someone know anything about this?

I'd love to have this issue solved because it's a little bit annoying to always brighten the screen with the Fn-keys everytime my notebook starts.

lucke · 2009-05-10 12:30:27

The workaround would be to change the brighntess via proc. "echo 100 > /proc/acpi/video/IGD/LCD/brightness" in ~/.xprofile or /etc/rc.local would do the trick on my netbook.

Leye · 2009-05-11 20:09:05

Hi lucke, thanks for your hint. I had to alter your command to my box though: Instead of echo 100 > ...", my notebook's brightness ranged from 0 to 6. Thus, "echo 6 > ..." did the job.

Unfortunately, I first had to "sudo su" before I could change the brightness file. Is there any way how a normal user can change the brightness with that command?

lucke · 2009-05-11 20:10:42

You could put it into a bash script and chmod +s that script.

#! /bin/bash
echo 6 > /proc/acpi/video/IGD/LCD/brightness

Leye · 2009-05-12 15:13:28

I see, thanks lucke! Oh by the way, my path hasn't "IGD" in it, but a "LCDD":

cat /proc/acpi/video/VGA1/LCDD/brightness 
levels:  0 1 2 3 4 5 6
current: 6

I think almost everyone will know how to deal with a different path on their machine, just for the record.

Just out of curiousity: Do I have to worry about my screen if I always change its brightness? It's because right now, I *always* have to brighten the screen, and of course it's a notebook's feature, but perhaps the screen isn't suitable for lots of brightness changing.

Last edited by Leye (2009-05-12 15:15:38)

lucke · 2009-05-12 15:25:27

I don't think changing the brightness has any negative effect on longevity of the screen.

Leye · 2009-05-13 12:30:39

Alright, you've answered all my questions, thank you very much lucke.

Leye · 2009-05-21 08:40:17

I'm quite puzzled now. Using the command within a root terminal works, but adding it to /etc/rc.local doesn't have any effect. Also, I've recently installed boxee, and during startup the screen darkens, too. Perhaps some X/Intel related issue? I fear I just have to wait until some package updates for Kernel/Intel/X/Udev/...

stefanwilkens · 2009-05-23 13:18:23

I have the same chip and no such issues, could it be that gnome-power-manager has some very low brightness settings that are being loaded on boot?

System -> Preferences -> Power Management

Arch Linux

#1 2009-05-10 12:19:57

Screen darkens during udev startup and X startup

#2 2009-05-10 12:30:27

Re: Screen darkens during udev startup and X startup

#3 2009-05-11 20:09:05

Re: Screen darkens during udev startup and X startup

#4 2009-05-11 20:10:42

Re: Screen darkens during udev startup and X startup

#5 2009-05-12 15:13:28

Re: Screen darkens during udev startup and X startup

#6 2009-05-12 15:25:27

Re: Screen darkens during udev startup and X startup

#7 2009-05-13 12:30:39

Re: Screen darkens during udev startup and X startup

#8 2009-05-21 08:40:17

Re: Screen darkens during udev startup and X startup

#9 2009-05-23 13:18:23

Re: Screen darkens during udev startup and X startup

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