This was just discussed at length in #udev. Summary:
- keys are not hardware wired if the video modules'
brightness_switch_enabled parameter is "N", and hardwired if the
parameter is "Y" (which is the default in ubuntu Lucid at least, see
"cat /sys/module/video/parameters/brightness_switch_enabled")
- key presses always generate input events on the LNXVIDEO input device,
regardless of the brightness_switch_enabled parameter
- key presses generate input events on the atkbd device (which is controlled
by the udev keymap) _if_ brightness_switch_enabled == Y
So in summary, since we always have the LNXVIDEO ones, but only
sometimes the duplicate ones from atkbd, we should explicitly blacklist
the keys from atkbd, so that things will work on all configurations.
** Package changed: linux (Ubuntu Lucid) => udev (Ubuntu Lucid)
** Changed in: udev (Ubuntu Lucid)
Status: Triaged => In Progress
** Changed in: udev (Ubuntu Lucid)
Assignee: (unassigned) => Martin Pitt (pitti)
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brightness is broken on MSI WIND U100
https://bugs.launchpad.net/bugs/415023
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