Red Hat Bugzilla – Bug 229358
Cannot adjust brightness on Dell 640m with Intel 945GM graphics
Last modified: 2008-05-06 15:15:48 EDT
Description of problem:
This seems to be a problem common to notebooks using Intel 9xx video. I have a
Dell 640m (Intel 945GM) where the brightness is controlled by a special key
combination (Fn+Up or Fn+Down). These do not work once I'm past the BIOS
welcome screen. If I hit the Fn+Up keys during bootup I can change the
brightness, but once the grub splash screen appears these keys no longer work.
Hitting Fn+Up while in text mode after boot up results in the following errors:
atkbd.c Unknown key pressed (translated set 2, code 0x86 on isa0060/serio0)
atkbd.c Use 'setkeycodes e006 <keycode>' to make it known.
video device notify
I don't know what the last line means here since it's not preceded with atkbd.c.
Obviously if I knew what keycode to use, I could put a setkeycodes command into
See, for similar reports, http://ubuntuforums.org/showthread.php?t=290994.
There are similar bug reports here of problems with brightness control on other
notebooks. My bet is that we're all experiencing the same problems.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot up.
2. Wait for login screen. Press Fn+Up/Down.
3. Nothing happens.
no change in brightness
brightness up or down
I forgot to mention that this problem exists when the machine is on battery.
When connected to AC, the screen operates at full brightness at all times.
Does Fn+Down generate a different message? In particular does the 'code 0x86'
1) If I boot directly into a shell by adding init=/bin/sh to the kernel command
in grub, I can control the screen brightness with the Fn+Up/Down keys.
2) If I boot with init into text mode (runlevel 3), I cannot use these keys.
Pressing the Fn+Dn combination results in "code 0x85" and "e005" replacing the
"0x86" and "e006" that Fn+Up generates.
3) Obviously I can't use these keys in run level 5 either.
OK, then very obviously this is not bug in Xorg, but somewhere in the kernel.
Reassigning to different component.
Fedora apologizes that these issues have not been resolved yet. We're
sorry it's taken so long for your bug to be properly triaged and acted
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make sure no important bugs slip through the cracks.
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If this bug is still open against Fedora Core 1 through 6, thirty days
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This bug is open for a Fedora version that is no longer maintained and
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