[Bug 55500] [sna gen4 w/a] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #164 from Zdenek Kabelac <zdenek.kabelac at gmail.com> ---
Created attachment 92240
  --> https://bugs.freedesktop.org/attachment.cgi?id=92240&action=edit
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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