[Bug 32789] New: VSync loss after rotation to portrait mode

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Jan 3 00:53:33 PST 2011


           Summary: VSync loss after rotation to portrait mode
           Product: Mesa
           Version: 7.9
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: stapostol at gmail.com

Created an attachment (id=41580)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41580)
Xorg log file

I have a monitor that can be rotated from landscape (1920x1080) to portrait
mode (1080x1920) and vice versa. When I use the monitor in landscape mode, I
can see a perfectly vsynced desktop. Once I move to portrait mode (xrandr -o
left), the vsync is lost and scrolling or moving windows becomes a tearing

Compiz is running in both cases, with its "sync to vblank" setting enabled. (If
I disable compiz, I get tearing in both landscape and portrait mode - even

This is on Ubuntu 10.10:
- 'uname' gives Linux 2.6.35-24-generic
- 'glxinfo' gives
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: Mesa DRI R600 (RV770 9442) 20090101  TCL DRI2
OpenGL version string: 2.1 Mesa 7.9-devel

My Xorg.0.log is attached.

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