[Bug 67377] New: [sna 4500MHD] Glyph corruption, changes with repaint

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67377

          Priority: medium
            Bug ID: 67377
          Assignee: chris at chris-wilson.co.uk
           Summary: [sna 4500MHD] Glyph corruption, changes with repaint
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: yumpusamongus at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/intel
           Product: xorg

Created attachment 83062
  --> https://bugs.freedesktop.org/attachment.cgi?id=83062&action=edit
Video of problem

Characters are drawn incorrectly with some small probability on every repaint.
This causes a few characters on screen to be corrupt most of the time, and
makes a rather odd flickering effect when resizing windows.  See attached video
for example. Symptoms appear not to be present with bitmap or monospace fonts.

A git bisect suggests the problem appeared here:
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=2a59eadf8165bd70780ac16220456c6196ac3ff1

It would seem the glyph mask hack is still needed.

I was able to reproduce the problem with xf86-video-intel 2.21.12 on Xorg 1.12
(Debian Sid) and on Xorg 1.14.99.1-167-gff38bbe, built using the instructions
in the ModularDevelopersGuide.

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