[Bug 36699] New: [RV770] Permanently unrendered regions after loading/dismissing context menus

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36699

           Summary: [RV770] Permanently unrendered regions after
                    loading/dismissing context menus
           Product: xorg
           Version: 7.6
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at canonical.com
         QAContact: xorg-team at lists.x.org


Rectangular regions of the screen become unpaintable (nothing redraws in that
area) after displaying and dismissing a context menu.

The system has RV770 graphics on two heads using metacity (no compositing) and
the r600g driver.

The rectangular regions are slightly larger dimensionally than the context menu
that had triggered them.  When they pop up they show a snapshot of whatever had
been displayed - snippets of web pages typically.  When I hover the mouse
cursor over them, the cursor will change shape back to an arrow.  The region
also blocks clicks if there is a hyperlink or button behind it.  Regular
windows will not paint over these areas, however subsequent context menus will
display over the top of them (and can be used normally).

This is an intermittent problem that occurs only once my system has been up for
a period of a few days.  Once it starts, I'll generally see it multiple times
in short successions.  I have particularly noticed it with the Chromium web
browser, although that may just be because that's pretty much the only
application I do a lot of right click context menu usage on.  I did notice an
inverse effect when I did a context menu on a gnome-terminal window, it
restored a portion of one of the regions (see screenshot).

About 50% of the time, I can switch desktops via ctrl-alt-arrow, and with
sufficient switching it will sometimes disappear.  The other half of the time
the region sticks around persistently until reboot.

If I switch to vt console, the screen is fine (black text console).  On
switching back to X, the unrendered regions are back, but instead of displaying
old graphics they are just grey.

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