Same issue with Samsung q45 with Nvidia GForce 8400M. (nvidia proprietary
driver)
I found that the cvs (!) version of nvclock
(http://www.linuxhardware.org/nvclock/) supports brightness change.
I just followed instructions there to get the cvs version, compiled it, copied
nvclock to /usr/bin and now 'nvclock -S 15' .. 'nvclock -S 100' work perfectly.
Then I made a workaround which makes hal to change brightness through nvclock.
For this I modified
'/usr/lib/scripts/linux/hal-system-lcd-set-brightness-linux' and
'/usr/lib/scripts/linux/hal-system-lcd-get-brightness-linux'. I don't know the
*correct* way to do this.
Now I can change brightness using gnome's Power Manager Brightness Applet.
However when I press Fn-Up/Fn-Down it works like the corresponding key code
gets emitted repeatedly, so the keyboard freezes until I press Alt-Ctrl-F1 and
Alt-Ctrl-F7. It looks similar to what is discussed here:
https://bugs.launchpad.net/bugs/212800 and I am going to try to downgrade bios
- may be it fixes the problem.
** Attachment added: "hal-system-lcd-set-brightness-linux"
http://launchpadlibrarian.net/20859843/hal-system-lcd-set-brightness-linux
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backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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