ubuntu-x-swat team mailing list archive

[Tom Gelinas <tom.gelinas@xxxxxxxxx>]

I can now force the nvidia driver to control the backlight. I don't know
why it didn't work before, I did 2 hard reboots and the setting didn't
take effect. Regardless, the nvidia's backlight controller is still less
effective than the one used by nouveau or in a text mode VT. The nvidia
driver's backlight control should not be force-enabled by default
because it changes the brightness in inconsistent increments and causes
a buzzing noise to emanate from the LED backlight. This noise is at
different frequencies according the the level of brightness, and
sometimes ceases for a fraction of a second while the backlight is
changing from one brightness level to another. Is there anything I can
do to give a  comparison of the brightness levels passed by nouveau
driver or in a text mode VT? I'd assume there is something in Sysfs.

What is the difference between how a text mode VT or nouveau change the
backlight brightness, compared with how nvidia does it? Gnome should be
forced to use a non-nvidia method by default.

-- 
Backlight controls on ThinkPad T510 no longer function when using proprietary drivers
https://bugs.launchpad.net/bugs/562005
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which is subscribed to nvidia-graphics-drivers in ubuntu.