Public bug reported:
Ubuntu 9.10, latest updates as of 27/11/2009.
# uname -r
2.6.31-15-generic
Systems affected: bug showed up after upgrade from 8.10 to 9.10.
After normal bootup Fn+Home/Fn+End keycombos (brightness up/down) are ignored
and nothing happens.
acpi_listen shows no events for this keypresses, xev and getkeycodes also give
nothing.
As this keys were working good on 8.10 the first thing to try was to
boot from 8.10 livecd and try to monitor ACPI/xev/getkeycodes there.
Experiment showed that this keys were generating acpi events on 8.10,
and it is obvious that they got lost somehow in 9.10. Most probable
cause for this to happen was the KMS introduced in 9.10, so I tried to
add nomodeset kernel parameter to the grub configs. After booting up
keys started to work like a charm (there's a problem with them anyhow
that the brightness level happen to change in a huge and unpredictable
steps, and sometimes it "stucks" with a brightness set not to the
maximum available level no matter how much times I press Fn+Home combo;
setting brightness to maximum using the gnome power manager LCD
brightness panel applet works as it should).
The only thing affected when the KMS is active are ACPI events for
brightness change keycombos, while brightness control works fine using
the applet I had mentioned earlier.
** Affects: ubuntu
Importance: Undecided
Status: New
--
ACPI keyboard events for backlight brightness up and down gone when using KMS
on LG LGR405-G.CP22R1 notebook (Intel GMA X1300)
https://bugs.launchpad.net/bugs/489011
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