[Bug 93567] New: [DRI3][SNA] Sandybridge (gen6, gt2) backend: blank(black) elements

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93567

            Bug ID: 93567
           Summary: [DRI3][SNA] Sandybridge (gen6, gt2) backend:
                    blank(black) elements
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: h.mth at web.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120777
  --> https://bugs.freedesktop.org/attachment.cgi?id=120777&action=edit
system information (uname -a, lspci -vv -k, packages info, xorg log)

I am using xf86-video-intel git version. latest release from last year has a
bad experience with my hardware. Using dri2/sna or dri2/uxa exhibits kernel gpu
hangs; dri3/sna has the best experience until now without kernel gpu hangs.

Though, sporadically ui elements are not redrawn. image will be attached.

This happens in firefox quite often, combobox pull-downs are black, load a page
and the ui element in focus is black, then redrawn after a moment.

Youtube HTML5 player in firefox:
- newly drawn elements are black, move mouse over elements, then it is redrawn.
- click on an element and other elements turn blank(black).
- close fullscreen video -> mate desktop panel is not redrawn.

System information is attached.

If you need any other information, let me know.

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