Bug 85459

Summary: DPMS not working on Dell M4800 / QHD+
Product: xorg Reporter: Ed Santiago <freedesktop>
Component: Driver/nouveauAssignee: Nouveau Project <nouveau>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: minor    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Xorg.0.log none

Description Ed Santiago 2014-10-25 22:06:38 UTC 
Created attachment 108419 [details]
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.
Comment 1 Ed Santiago 2015-10-24 13:57:29 UTC 
Problem persists on kernel 4.0.5 xorg-server 1.16.4
Comment 2 Martin Peres 2019-12-04 08:50:51 UTC 
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