Since I’ve upgraded from 319.60 to 331.20 the backlight-intensity from my Qosmio X770 could only set to approx 70% of its original intensity.
Setting the backlight intensity darker is working but if I set it to 100% it’s only approx 70% of its original.
I’ve tested the kernel-param. acpi_backlight=vendor then the intensity is staying at 100% but at the end I can’t control the backlight.
(I’ve tested the acpi-Parameter too, but nothing gonna change)
It seems the NVidia-Driver 331.20 is using the ACPI-Table to get the max brightness, but the 319.60 don’t.
It would be nice if there is an option to disable the function for using the ACPI-Table or there is a solution to get the driver working without the disadvantage, because playing at 70% brightness from the backlight isn’t very funny and working with it is like sittin’ in a darkroom ;)
Ps.: I have the same strange behavior under windows, but i don’t care about cuz I’m not using this system very often.
The nouveau works correct… but the nouveu is no option for me.