[Nouveau] [Bug 107453] New: Laptop display goes blank when system in power saving mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107453

            Bug ID: 107453
           Summary: Laptop display goes blank when system in power saving
                    mode
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: passiday at gmail.com
        QA Contact: xorg-team at lists.x.org

My laptop (GeForce GTX 860M) display goes black at random times, while the
external display (if plugged in) remains visible. The blanking is not limited
to contexts when the external display is plugged in. When on battery, or
plugged in, in all those contexts the laptop display very predictably goes
black after short use of the display. The only context when it remained visible
is when there is no application launched on the laptop display, just the
desktop picture visible.

I have described a lot of detail in this Ask Ubuntu post:
https://askubuntu.com/questions/1024576/laptop-screen-randomly-switches-off-ubuntu-16-04-4-lts-external-display-attach

Today I have switched to the NVIDIA binary driver and it appears that no
blanking occours anymore. At least in the typical scenarios that used to cause
the blanking, for example full-screen YouTube video.

My guess is that the built-in display mode "brightness turned a bit down" that
kicks in in some power-saving scenarios, is not properly implemented and causes
the display go black.

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