[Bug 88889] New: [ILK] Triangle tering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88889

            Bug ID: 88889
           Summary: [ILK] Triangle tering
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Triangle tearing (this is not exact definition of what you can see on attached
screenshots, but the point is - this artifact seems like occur under similar
conditions as typical tearing, and most of the time looks like triangle) is
observer for example while fast scrolling or selecting text in Konsole or
scrolling folder with many files in Dolphin, and so on. But, for some reason,
not while video playback (xv, opengl and vaapi video outputs tested).

Reproducible in: Mesa 10.3.2 and driver version 2.99.914-1~exp1ubuntu4.1 with
SNA acceleration, Mesa 10.5~git1501311930.609461 and driver version
.99.917+git1501311931.dac01d with both of SNA and GLAMOR acceleration.
Not reproducible in: Mesa 10.3.2 and driver version 2.99.914-1~exp1ubuntu4.1
with GLAMOR acceleration.
(Actually, I not sure issue in driver, because I just compare default Kubuntu
14.10 packages set (libdrm, video driver, mesa, etc.) and set from Oibaf PPA,
but since there is difference between SNA and GLAMOR I this is issue in the
driver.)

Change kernel version seems like doesn't make any difference. For example with 
Mesa 10.3.2 and driver version 2.99.914-1~exp1ubuntu4.1 with GLAMOR
acceleration there is no tearing on stock Linux 3.16.0-30 from repo and on
Linux 3.18.5. Boot Linux 3.16.0-30 with Mesa 10.5~git1501311930.609461 and
driver version 2.99.917+git1501311931.dac01d gave tearing anyway. 

I tried TearFree with Mesa 10.5~git1501311930.609461 and driver version
2.99.917+git1501311931.dac01d with SNA, but TearFree doesn't help.

In SNA mode I tested kwin, and in GLAMOR mode I tested kwin_gles (4.11.12) in
both cases in Full repaint V-Sync mode in KWin settings.

With disabled desktop effects I doesn't see this artifact (not reproducible or
I just can't notice it).

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20150131/53742445/attachment-0001.html>