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[Bug 1040718] Backlight Control Lost with Install of NVidia Driver on 42.2, fix for 42.3?
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Thu, 25 May 2017 20:44:37 +0000
  • Message-id: <bug-1040718-21960-jo2SSgHr7r@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1040718
http://bugzilla.opensuse.org/show_bug.cgi?id=1040718#c6

--- Comment #6 from Daniel Dadap <ddadap@xxxxxxxxxx> ---
Thanks; I don't see the Backlight property listed in your xrandr output.
Perhaps Nouveau doesn't expose it, either in general, or on your hardware.

I fired up a random laptop with an NVIDIA GPU and confirmed that I don't see
the Backlight property when running Nouveau, but I do when running the NVIDIA
driver. On this particular system, the valid range is 0-100 on LVDS-0, so the
example xrandr command from comment #3 should work verbatim.

Here's a snippet from my xrandr output so you can see what it should look like
if the Backlight property is properly exposed:

LVDS-0 connected primary 1920x1080+0+0 (0x2e0) normal (normal left inverted
right x axis y axis) 344mm x 194mm
Identifier: 0x2df
Timestamp: 740325
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2 3
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
_MUTTER_PRESENTATION_OUTPUT: 0
CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
Backlight: 10
range: (0, 100)

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