[Bug 59899] New: Diagonal rendering artifacts on xbmc

[Bug 59899] New: Diagonal rendering artifacts on xbmc

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

          Priority: medium
            Bug ID: 59899
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Diagonal rendering artifacts on xbmc
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: aeriksson@fastmail.fm
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Hi,

Just moved to xbmc (which uses gl), from freevo and more often than not, I get
extreme diagonal rendering artifacts on the gui. Pretty much each gui object (a
box, a single character, etc) has a diagonal split and either of the halves
renders o, and the other is mostly black. The diagonal flickers between the
corners at a rapid pase (~ 4 changes / second).

I files report on it at xbmc (http://trac.xbmc.org/ticket/14017) which also has
screenshots and a short movie grab attached.

Freevo worked ok, so I guess this is somehow related to new code paths executed
by xbmc (both 11.0 and 12-git suffers). I have no idea if it's kernel driver
related or somewhere higher in the stack.

Ideas to narrow this down appreciated. xbmc is the only app which behaves like
this.

-ath

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
This is more likely an issue in Mesa than in the kernel.

Please attach Xorg.0.log and the output of glxinfo and dmesg.

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

--- Comment #2 from aeriksson@fastmail.fm ---
Created attachment 73876
  --> https://bugs.freedesktop.org/attachment.cgi?id=73876&action=edit
dmesg

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

--- Comment #3 from aeriksson@fastmail.fm ---
Created attachment 73877
  --> https://bugs.freedesktop.org/attachment.cgi?id=73877&action=edit
glxinfo

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

--- Comment #4 from aeriksson@fastmail.fm ---
Created attachment 73878
  --> https://bugs.freedesktop.org/attachment.cgi?id=73878&action=edit
Xorg.0.log

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|DRI                         |Mesa
            Version|XOrg CVS                    |9.0
          Component|DRM/Radeon                  |Drivers/Gallium/r300

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
Might be interesting if you could try a recent Mesa Git snapshot.

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

--- Comment #6 from aeriksson@fastmail.fm ---
Tried mesa git as of yesterday. No improvement.
I've also tried to flip all USE flags on/off for mesa 9.0.1 with no
improvement.

Doing some surfing, I noticed the z buffer issues being a common problem, so I
decided to try the car racing game "trigger". It does show the same effect as
I've seen in screenshots on youtube (flickering triangular misrenderings on
objects). The dynamic behavior seems to be the same. However, I see the same
effect on the fist screen in Trigger, where the three helmets are shown. I'm
not sure if they are supposed to be animated or static. The zbuffer issues I
saw in other reports were all related to movements (Stuff move back/front, when
I move a little). I also have zbuffer issues on the terrain once the game
starts.

If xbmc makes use of depth to paint its screen with a bunch of objects, I can
see how this might be z related. However, xbmc should show a static screen (I
think), whereas common z reports are all related to movement of the observer (I
think).

Any ideas how one could test this theory?

Another crazy thing is that every once in a while it renders perfectly ok.
While "bisecting" through the USEflags, I had a run of "good, good, good,..."
and each test was a restart of Xserver, starting xbmc. After going back to the
known bad set of USE flags (which now rendered good!!), I did some cursing and
warm rebooted the box, and it suddenly rendered bad again :-(. This kind of
suggests an uninitialized HW register to me...

Any ideas how one can make xbmc not exercise the (gl?) related areas of the HW?
I'm lacking a solid known-good state at the moment.

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[Bug 59899] Diagonal rendering artifacts on xbmc

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https://bugs.freedesktop.org/show_bug.cgi?id=59899

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

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

--- Comment #7 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/349.

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