Description of problem: Since updating my Dell E1505 from FC5+updates to FC6, I can't control the screen brightness with the laptop's hotkeys and the screensaver no longer turns off the backlight. Version-Release number of selected component (if applicable): kernel-2.6.18-1.2798.fc6 How reproducible: Always Steps to Reproduce: 1. Press system hotkeys to increase or decrease LCD brightness Actual results: Nothing happens. Expected results: The screen brightness varies. The backlight powers off after an extended inactivity period. Additional info: Whenever I press a hotkey, the following ends up in syslog: Oct 30 07:39:04 tako kernel: atkbd.c: Unknown key pressed (translated set 2, cod e 0x85 on isa0060/serio0). Oct 30 07:39:04 tako kernel: atkbd.c: Use 'setkeycodes e005 <keycode>' to make i t known. Oct 30 07:39:04 tako kernel: video device notify Judging by the logs, the first two were already emitted under FC5, while the third one is something new. I can also manually change the brightness by fiddling with the file /proc/acpi/video/VID/LCD/brightness The contents are a bit strange: # cat /proc/acpi/video/VID/LCD/brightness levels: 84 48 12 24 36 48 60 72 84 100 current: 84 those 84 and 48 at the beginning look out of place and that 100 at the end seems to have no effect. The BIOS was recently updated to A09, maybe that could explain the situation?
I can confirm that. The same hardware (Dell Inspiron E1505 Dual Core, Bios A09), the same kernel (2.6.18-1.2798.fc6, i686), the same behaviour. as an addition, following lines apear in /var/log/acpid when I'm trying to change brightness: [Tue Oct 31 23:06:10 2006] received event "video LCD 00000086 00000000" [Tue Oct 31 23:06:10 2006] notifying client 2052[68:68] [Tue Oct 31 23:06:10 2006] notifying client 2153[0:0] [Tue Oct 31 23:06:10 2006] completed event "video LCD 00000086 00000000" [Tue Oct 31 23:06:10 2006] received event "video LCD 00000086 00000000" [Tue Oct 31 23:06:10 2006] notifying client 2052[68:68] [Tue Oct 31 23:06:10 2006] notifying client 2153[0:0] [Tue Oct 31 23:06:10 2006] completed event "video LCD 00000086 00000000"
Today I've investigated further. The problem exists also on: kernel-smp-2.6.18-1.2200.fc5 (last FC5 kernel, but OS is still FC6) Last kernel _without_ this bug is kernel-smp-2.6.17-1.2187_FC5 (tested on FC6). Manually changing brightness by echoing values to /proc/acpi/video/VID/LCD/brightness works OK.
It seems like 'video' ACPI module is causing troubles. I don't know how to really fix it, but: <code> echo "alias video off" > /etc/modprobe.conf </code> is a quick solution that works here. Unfortunatelly, manually removing 'video' module on running system does not help (modprobe removes it, however adjustment buttons don't work) - reboot is needed. So, it seems to me like an upstream kernel issue.
Hello, I'm reviewing this bug as part of the kernel bug triage project, an attempt to isolate current bugs in the Fedora kernel. http://fedoraproject.org/wiki/KernelBugTriage I am CC'ing myself to this bug, however this version of Fedora is no longer maintained. Please attempt to reproduce this bug with a current version of Fedora (presently Fedora 8). If the bug no longer exists, please close the bug or I'll do so in a few days if there is no further information lodged. Thanks for using Fedora!
Closing per previous comment. If you can provide the requested information, please feel free to re-open this bug.
Tested on Fedora 8 - everything works as it should.