Ubuntu
hotkey-setup package

  1. Bug #95444
  2. Comment #34

Comment 34 for bug 95444

Revision history for this message
Michael Lustfield (michaellustfield) wrote : Re: No Screen Backlight Control; Sony Vaio with nvidia 8 series graphics

I just want to add that nothing works until I do 'xrandr --output LVDS --set BACKLIGHT_CONTROL native'. After that, xbacklight and function keys work to set screen brightness.

I also get this:
michael@panther:~$ smartdimmer -g
init_nvclock() failed!

As far as this error goes...
michael@panther:~$ /etc/acpi/sonybright.sh down
cat: /sys/class/backlight/sony/brightness: No such file or directory
/etc/acpi/sonybright.sh: line 8: [: : integer expression expected
/etc/acpi/sonybright.sh: line 15: /sys/class/backlight/sony/brightness: No such file or directory

The reason is because the file has moved to /sys/class/backlight/acpi_videoX/brightness where X is either 0 or 1. However, changing this value doesn't seem to make a difference in the screen brightness.

I don't know if any of this was useful to anybody else, but I hope so.