I cannot change the brightness of the monitor on a laptop either from the command line or from keyboard shortcuts. I have verified that the file in /sys/class/backlight/acpi_video0/brightness is changing. I have also verified that I am running the nvidia drivers.
Things I have tried:
Adding entries to /etc/default/grub The
GRUB_CMDLINE_LINUXentries now read
GRUB_CMDLINE_LINUX_DEFAULT="quite nosplash acpi_backlight=vendor" GRUB_CMDLINE_LINUX="noapic"
I have also tried various commands here (with an update grub and reboot each time) but nothing has helped
I enabled brightness control in /etc/X11/xorg.conf so that it now looks like
Section "Device" Identifier "Default Device" Driver "nvidia" Option "NoLogo" "True" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection
linux-kamal-mjgbacklightand determined it was not applicable to my system
Nothing seems to have made any difference. I am using an Nvidia GeForce GT 330M with driver version 295.40. Does anyone have any other suggestions?