[Bug 65665] New: Rendering issues are back on gen4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65665

          Priority: medium
            Bug ID: 65665
          Assignee: chris at chris-wilson.co.uk
           Summary: Rendering issues are back on gen4
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sergio.callegari at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 80715
  --> https://bugs.freedesktop.org/attachment.cgi?id=80715&action=edit
Image showing the artifact on a firefox page

Just a short note to report that after a period where these were not evident, I
am again experiencing important rendering issues on gen4 graphics card.

Some details:

Hardware DELL E6500
OS: kubuntu 13.04 + kernel updated to 3.9.5 via ubuntu mainline ppa
Graphics stack:

xorg core 1.13.3
xserver xorg video intel driver 2.21.9+ 
     (git snapshot taken 13-06-11 - b9439a...)
libdrm 2.4.45+
     (git snapshot taken 13-06-07 - a0178c...)
mesa 9.2+
     (git snapshot taken 13-06-11 - 761320...)

The artifacts are particularly evident in
- firefox (see attachment)
- libreoffice

In both cases the artifacts affect not just what is rendered, but also the
thumbnails created by the application (those in firefox start page and slide
and drawing thumbnails in libreoffice impress/draw).

Artifacts interest squared chunks on the screen where patterns appear instead
of images.

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