[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 #175 from Edward Sheldrake <ejsheldrake at gmail.com> ---
Created attachment 92770
  --> https://bugs.freedesktop.org/attachment.cgi?id=92770&action=edit
not quite random corruption example

With the workarounds disabled, can anything be deduced from the text or pixmap
corruption not seeming to be completely random?

Italic text seems to be particularly badly hit, and it seems to vary with the
font and size. But in the attached screenshot, some of the lines of text never
showed any corruption, while others usually showed some corruption, the
corruption changing on switching focus to another window and back. Size 10
italic Cantarell seemed particularly badly hit, with even lines of just
repeated c or d characters showing corruption (if longer than 18 letters), but
other fonts don't usually show any corruption on a line of text filled with a
single repeating character.

For pixmap corruption, the printer icon in the gedit toolbar seems to get
turned into grey vertical bars more often than any other icons get corrupted.

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