[Bug 63636] New: SNA/Gen4 xrandr mangles the screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63636

          Priority: medium
            Bug ID: 63636
          Assignee: chris at chris-wilson.co.uk
           Summary: SNA/Gen4 xrandr mangles the screen
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sergio.callegari at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Hi,

there is an issue that causes 100% reproducible screen mangling of the screen
on Gen4 hardware, using sna.

I see it on a machine with displayport. Attaching the exernal screen and
running

xrandr --output DP1 --auto --primary --output LVDS1 --off

is sufficient to mangle the whole screen. I do not know if this also happens
with VGA screens (i.e. without displayport), but I suspect it is the case.

Note that after having corrupted the screen with the command above, you succeed
in blindly writing

xrandr --output LVDS1 --auto --primary --output DP1 --off

then screen is restored.

Also note that you can make the problematic command work fine, if you split it
in two steps

xrandr --output DP1 --primary --auto --output LVDS1 --auto --right-of DP1
xrandr --output DP1 --auto --primary --output LVDS1 --off

Thanks for the attention!

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20130417/d9c7f649/attachment.html>