[Bug 96820] New: intel-virtual-output: bad performance

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96820

            Bug ID: 96820
           Summary: intel-virtual-output: bad performance
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: main.haarp at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hey,

I'm using intel-virtual-output on a Thinkpad W520 (Sandy Bridge, Nvidia GPU).
xf86-video-intel-2.99.917.

I'm facing bad performance on the virtual screens. Cursor movement for instance
is choppy. It feels as if the monitors are running at low fps (despite the fact
that they're physically running at their fill 59.95Hz)

When there is movement on the virtual screen, e.g. a video being shown, CPU
usage of the Xorg process running on the Nvidia rises sharply (package power
consumption as shown in turbostat rises from 8 to 30W)

I'd like to improve this. Is there anything I can do to diagnose this or
provide useful information?

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