I am trying to summarise some info take from other bugs here.
In bug #230421, we learn that the following changed in the acpi-support package
in Ubuntu 9.10:
* Drop events/video_brightness{down,up}, video_brightness{up,down}.sh: at
least some platforms that use these ACPI sequences are seeing them
correctly translated to input events, so those users will see duplicate
events unless we drop them. LP: #178860.
Mike, can you please run the 'acpi_listen' command, and report here any
output produced when you press the brightness keys?
This bug also suggest to look at the
https://wiki.ubuntu.com/Hotkeys/Troubleshooting page.
Bug #385723 seems the general missing backlight control for Linux
kernel.
Bug #320874, is very interesting, and was fixed in kernel 2.6.29:
http://bugzilla.kernel.org/show_bug.cgi?id=12249 (reading fast, could be BIOS
related).
Bug #388216 (because KMS)
What I call sub-bug 3, (brightness not saved) is in bug #35223, and they did
fill a bug directly to gnome project:
https://bugzilla.gnome.org/show_bug.cgi?id=335673
Bug #131650, brightness keys not working on Vaio SZ-140p.
Sony Vaio have LOTS of bug reports...
Bug #223954 (brightness controls still has major bugs) (mostly about going back
to 100% when opening lid), asked to do:
Thanks for your report but we need more information about your bug. Please, run
gnome-power-bugreport.sh and gconftool -a /apps/gnome-power-manager/backlight.
Bug #406515, for Lenovo, but showing how to determine keycodes, also
link to Lnux kernel bugs.
Ok, I'll stop there for now, just to show that there is many kernel
issues going on around this.
** Bug watch added: Linux Kernel Bug Tracker #12249
http://bugzilla.kernel.org/show_bug.cgi?id=12249
** Bug watch added: GNOME Bug Tracker #335673
https://bugzilla.gnome.org/show_bug.cgi?id=335673
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g-p-m brightness not applied anymore after rebooting
https://bugs.launchpad.net/bugs/503577
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