[Bug 92323] Font rendering issue on Intel GMA X3100/X4500 with Android-x86

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92323

            Bug ID: 92323
           Summary: Font rendering issue on Intel GMA X3100/X4500 with
                    Android-x86
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: issor.oruam at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 118723
  --> https://bugs.freedesktop.org/attachment.cgi?id=118723&action=edit
Initial setup systematic artifact

There is a nasty font rendering problem affecting Intel GMA X3100/X4500
and other chipsets belonging to the same family driver i965GM.

The problem appeared with mesa 10.5, survived mesa 10.6, mesa 11.0 and it
affects also mesa 11.1.0devel.

Mesa 10.4 branch was completely unaffected.

There are many analogies between font artifacts observed on both kitkat-x86 and
lollipo-x86 builds which resemble the artifacts described in the following
links:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1342675

https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1432194

http://ubuntuforums.org/showthread.php?t=2241482

http://askubuntu.com/questions/584922/how-do-i-fix-fonts-not-rendering-and-missing-letters

We tried very hard to isolate the commit causing this, which should be around
10.5 branchpoint ... 10.5.0 release, but a lot happened (format_pack, NIR and
i965)

Prime suspect is 

Forcing MSAA antialiasing in Developer Settings does not solve the problem.
The GUI elements shown in the attachments are systematically affected with
10.6, 11.0 and 11.1.0devel, but in the latter the font artifacts started
appearing as vertical stripes, while in the former branches

Another clue is that all characters of the same letter appear with the exact
same artifact and Settings, Google Play are heavily affected by font
transparency, causing the GUI to be unusable.

S.O.S.

Mauro

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