[Mesa-dev] [Bug 80069] New: rendering problems: black areas in KDE desktop. [mesa 10.2.1 (not with 10.1.4)]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80069

          Priority: medium
            Bug ID: 80069
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: rendering problems: black areas in KDE desktop. [mesa
                    10.2.1 (not with 10.1.4)]
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: 4607vrfcr84spd21f08 at weg-werf-email.de
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Mesa core
           Product: Mesa

Since I updated mesa-related packages (Arch Linux) some days ago I had a black
screen (with mouse cursor) after login (via KDM) into KDE. I use a Intel 855GM
graphics (driver: SNA compiled from 2.99.911-114-g94e3932 OR xf86-video-intel
2.99.912).

Some of my observations with KDE 4.13.2:

* black screen (after login with KDM) or parts/areas - see attached
screenshots. Mouse cursor is always correct.
* alt+f2 (krunner) brings the desktop content back but only until a program is
started (then parts get black again)
* Starting programs partly removes black areas. E.g. Ctrl+Esc brings up the
process viewer, but only with partly non-black window decoration.
* the log-off menu does not appear (only the screen dims as expected) after
right clicking the desktop → log-off.
* it only happens with active "desktop effects" (transparency, shadows, ...).
Switching those off in KDE instantanously removes the rendering problem.

No issues observed in Openbox or TWM (well, those have no tranparency and so
on).

Workaround - Downgrade those packages:

>   [2014-06-11 02:57] [PACMAN] downgraded mesa (10.2.1-1 -> 10.1.4-1)
>   [2014-06-11 02:57] [PACMAN] downgraded mesa-libgl (10.2.1-1 -> 10.1.4-1)
>   [2014-06-11 02:57] [PACMAN] downgraded intel-dri (10.2.1-1 -> 10.1.4-1)

A previous discussion / report was at [KDE desktop black after upgrade of mesa
and intel-dri](https://bbs.archlinux.org/viewtopic.php?id=182699).

I know of [X segfault after Mesa
upgrade](https://bugs.archlinux.org/task/40781?project=1&cat[0]=2&string=mesa)
but I guess I see something different since I have no segfaults.

I could run a version from git or do a bisect if this is needed. In this case:
mention the git source.

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