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 -- backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M) https://bugs.launchpad.net/bugs/146710 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
