[Bug 96970] New: Graphics artifacts with recent SNA driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96970

            Bug ID: 96970
           Summary: Graphics artifacts with recent SNA driver
           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: bladeon at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

A recent version of the SNA driver is causing strange drawing issues on my
machine. Areas of the screen will either fail to update, or switch between the
correct display and an old version. In both cases, doing something to trigger a
redraw in the affected tends to fix it, however it doesn't always, it seems
that "smaller" changes don't necessarily fix it. For example, scrolling through
logs on the terminal will cause blocks containing the timestamps to stop
updating until more than a few characters change within the block.

I have the issue in the driver built from commit 26f8ab5 but not with a508b11.

I am running ArchLinux on a Lenovo ThinkPad T540p. I have an Intel i7 Haswell
chip and am using the integrated graphics card.

My Xorg configuration is just set to use SNA and has TearFree enabled. Using
UXA fixes the problem, but causes tearing issues (that have always been
present). I am also using Bumblebee.

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