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

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

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=32789

           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@lists.freedesktop.org
        ReportedBy: stapostol@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
fest.

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
worse!)

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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[Bug 32789] VSync loss after rotation to portrait mode

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=32789

--- Comment #1 from Maarten Maathuis <madman2003@gmail.com> 2011-01-03 06:11:26 PST ---
Landscape mode is the default rendering mode (it's called normal), anything
else causes the X server to create a new frontbuffer and render with a
transform onto this rotated frontbuffer (this process isn't backbuffered last
time i checked). Everytime the X server receives "damage" on the "normal"
frontbuffer it will update the rotated frontbuffer. This transform happens
outside compiz/opengl (which was used to get the vsync). This is just a generic
story, not sure if this is easy to fix for amd hardware.

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[Bug 32789] VSync loss after rotation to portrait mode

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=32789

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #41580|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 32789] VSync loss after rotation to portrait mode

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=32789

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|Mesa                        |xorg
            Version|7.9                         |unspecified
          Component|Drivers/DRI/R600            |Driver/Radeon
         AssignedTo|dri-devel@lists.freedesktop |xorg-driver-ati@lists.x.org
                   |.org                        |
          QAContact|                            |xorg-team@lists.x.org

--- Comment #2 from Michel Dänzer <michel@daenzer.net> 2011-01-03 07:46:34 PST ---
Option "EXAVSync" might fix the tearing but will slow things down.

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