Created attachment 92240
Text with errors

Recently I'm noticing somewhat more 'weird' behavior - it might be
related to my temporal usage of night releases of Mozilla (since rawhide
version got somewhat broken)

What is weird in this image is - the text was badly rendered AND it
remained visible even when refreshed, even small scroll up/down left the
text as is - it helped only to scroll text out of window and back.

So I assume now the rendering happens to some off-screen memory - which is then 
transfered back to screen with errors - and refresh doesn't help with this case.
(and it's a bit different then during typing text into input box).

Another probably unrelated comment could be - even when  'glxgears' is
running in parallel - the visual errors still happens during typing of
this text. I'd have expect the glxgears manages to 'overfill' GPU queue
(since it's rendering ~1300FPS with default window) also the flushes are
probably completely different. And - there is no observable rendering
error in gears window - only Firefox seems to be exposing them.

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https://bugs.launchpad.net/bugs/1098334

Title:
  [gen4 sna] Font corruption

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