[Bug 93125] New: Rendering artifacts in SNA for small regions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93125

            Bug ID: 93125
           Summary: Rendering artifacts in SNA for small regions
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: jskarvad at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

On Fedora 22 with SNA I encountered the following rendering artifacts when used
emerald decorator:
https://bugzilla.redhat.com/attachment.cgi?id=1096086

HW used:
graphics:  Card: Intel Haswell-ULT Integrated Graphics Controller
           Display Server: Fedora X.org 117.4 drivers: intel (unloaded:
fbdev,vesa)
           Resolution: 1366x768 at 60.00hz
           GLX Renderer: Mesa DRI Intel Haswell Mobile
           GLX Version: 3.0 Mesa 10.6.9 (git-8957b69)

It seems the problem was caused by the following commit:
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=ef24cb1b223486d7dfe57f33c28d8692f9857c98

It works correctly in UXA. It works in SNA if I use git snapshot before the
above mentioned commit or even with the latest git head with the reverted above
mentioned commit.

It also works correctly with different drivers (e.g. nvidia).

I think it should work the same in UXA/SNA, thus filling this bug.

Downstream Fedora bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1283225

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