[Bug 61201] New: Black rectangles in Firefox (and Thunderbird) after upgrade to 5.21.15

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=61201

            Bug ID: 61201
           Summary: Black rectangles in Firefox (and Thunderbird) after
                    upgrade to 5.21.15
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.10.10
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kernelbugtracker at hackrid.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 108141
  --> https://bugzilla.kernel.org/attachment.cgi?id=108141&action=edit
Black rectangles in Firefox ater upgrade to 5.21.15

This is my first bug report. Please let me know if I did something wrong.

After upgrading from 5.21.14 to 5.21.15 my Firefox shows random black
rectangles. (photo attached)
They appear and disappear randomly while scrolling.
They disappear when Firefox window looses focus.
I recognised a few of them in Thunderbird. (But not as bad as in Firefox!)

I tried older versions of Firefox but I had the same issues.
Disabling hardware acceleration in Firefox changed nothing.

After downgrading to 5.21.14 everything works as usual.

I am using Arch Linux on a Lenovo x230t with an Intel HD4000.

Please let me know if I can do anything.

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