[SOLVED] Screen brightness issues with Acer 5372Z

The screen of my laptop goes black whenever I boot into ArchLinux, after "reading Udev events" on startup. Most of the time I have to use a flashlight to see the console on my screen and type
sudo setpci -s 00:02.0 F4.B=20
to set screen brightness manually. The `Fn` + `Brightness up` combination doesn't work on my machine, but that's not an issue with Arch, but fault to sugar in coffee.
There are a lot of similar threads in this forum, but none of the solutions described there really worked 100% or not at all, that's why I'm opening a new thread as this seems to be specific to my hardware.
Details:
Graphics controller:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
Screen resolution:
1366*766
/boot/grub/menu.lst:
# (0) Arch Linux
title Arch Linux
root (hd0,0)
kernel /vmlinuz-linux root=/dev/sda10 resume=/dev/sda5 ro vga=775
initrd /initramfs-linux.img
/etc/rc.conf#DAEMONS:
DAEMONS=(hwclock syslog-ng network netfs crond laptop-mode dbus gdm)
I will describe here what I have did so far on hacking:
Installed the video driver for my Intel card as described here in the wiki
Set kernel mode to `nomodeset`, without specifying vga, of course, which surprisingly solved the issue, but prevented me from using Gnome.
The supposed solution in the Arch wiki doesn't work for me. It makes it worse, in the sense of dumping screen brightness even before "reading udev events" on boot.
My current workaround (to avoid using a flashlight) is to put this line into my `/etc/rc.local`:
setpci -s 00:02.0 F4.B=20
I wonder if you can help me to solve this issue, or point me to any of the great documentation provided by the Arch community I might have missed...
Last edited by kennym (2011-09-06 16:03:58)

rg_arc wrote:I have this problem as well for my Acer Aspire 4810TZ. The only thing I can think of is to make some sort of temporary fix. But I agree with you, There should be a permanent fix. Every time I've installed Arch on this computer the same problem arises and the only way I can change the brightness is the setpci terminal method.
This is bad news for new Arch (and Linux) users. This will be probably the point where they will turn over to another distribution.
It seems to be something which has been included in newer kernels, because I can remember that in the 2.6 series this issue did not exist.
Last edited by kennym (2011-09-05 16:05:08)

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Last edited by fettouhi (2012-04-05 06:00:06)

benny_kenobi wrote:
fettouhi wrote:1. When booting my machine grub2 gives an error saying "error: fd0 not found" (twice). My machine does not have a floppy drive and has never had one. There is no option in the BIOS to turn floppy off. So why is grub2 complaining about it?
Have you installed grub2 with that --no-floppy flag as described in:
https://wiki.archlinux.org/index.php/Grub2#BIOS_systems?
fettouhi wrote:2. With KDE 4.7.0 thumbnails of pdf files are not generated anymore, they were with previous versions of KDE4. Anybody else have that issue with 4.7?
fettouhi wrote:Does anybody else have that problem with jpegs and folder previews?
Nope. Is it selected in dolphin>settings>general>previews.
fettouhi wrote:5. I'm using KDE's microblogging plasma app to check my twitter account but I can't get to remember my password.
Well that won't be a solution, but you might use choqok instead - at least it stores the password.
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