DPMS not working on Dell M4800 / QHD+
Submitted by Ed Santiago
Assigned to Nouveau Project
Description
Created attachment 108419
Xorg.0.log
X screen blanks after timeout, but backlight remains on forever. "xset dpms force off" has no effect. "vbetool dpms off" does turn off the backlight. Using nvidia proprietary driver, "xset dpms force off" turns off backlight but then has other issues ( https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1268151 )
Curiously, and possibly related, "xset s activate" (via ssh and/or using sleep 1) has no effect. It does not blank the screen.
Possibly related, from Xorg.0.log:
[ 27.193] (II) NOUVEAU(0): No DPMS capabilities specified
version: nouveau from kernel 3.16.6-gentoo.
Attachment 108419, "Xorg.0.log":
Xorg.0.log