[Bug 73444] New: wayland/weston EGL/GLESv2 - top portion of screen in fullscreen: vertices being clipped/flicker

[Bug 73444] New: wayland/weston EGL/GLESv2 - top portion of screen in fullscreen: vertices being clipped/flicker

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73444

          Priority: medium
            Bug ID: 73444
          Assignee: dri-devel@lists.freedesktop.org
           Summary: wayland/weston EGL/GLESv2 - top portion of screen in
                    fullscreen: vertices being clipped/flicker
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: emiettin@edu.lahti.fi
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 10.0
         Component: Drivers/Gallium/r600
           Product: Mesa

In fullscreen wayland/weston EGL/GLESv2 clients without X11 (as in weston
launched from a tty), vertices ending up on the top 5-10% portion of the
vertical screen space are being clipped (as in seemingly skipped altogether and
disappearing), despite setting up an appropriate projection matrix + calling
glViewport. This results in flickering sawtooth-like edges on the top of the
screen area.

This effect doesn't show up
- in windowed mode 
- in screenshots (weston Super+s) 
- in screen capture (weston Super+r)
- while zoomed in using the weston Super+mwheel shortcut, or
- when using weston through X11.

Asking about this on #dri-devel on Freenode lead to the following hypothesis by
pq:

12:30 < pq> so if super+s, or zoom, or having it in a window makes the problem
go away, then the fundamental difference is likely that when weston composites,
everything goes well, but when weston tries to scan out the client image
directly, something breaks.

This occurs at least in mesa 9.2.x through git master.

setup:

Arch Linux x86_64 3.12.6-1, 
Radeon HD 5770 w/ {ati-dri, mesa, mesa-libgl}-9.2.5-1, -10.0.1-1, or -git
wayland-1.3.0-1, weston-1.3.1-2 or git.

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[Bug 73444] wayland/weston EGL/GLESv2 - top portion of screen in fullscreen: vertices being clipped/flicker

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https://bugs.freedesktop.org/show_bug.cgi?id=73444

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
(In reply to comment #1)
> 12:30 < pq> so if super+s, or zoom, or having it in a window makes the
> problem go away, then the fundamental difference is likely that when weston
> composites, everything goes well, but when weston tries to scan out the
> client image directly, something breaks.

Yes, it sounds like when weston tries to scan out the client surfaces directly,
you're intermittently seeing the wrong surface being scanned out, or the right
surface at the wrong time.

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[Bug 73444] wayland/weston EGL/GLESv2 - top portion of screen in fullscreen: vertices being clipped/flicker

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73444

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #2 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/480.

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