[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #112 from sergio.callegari at gmail.com ---
Created attachment 82369
  --> https://bugs.freedesktop.org/attachment.cgi?id=82369&action=edit
Handy phone snapshot of artifacts on chars post drm/i915 fix: Only clear
write-domains after a successful wait-seqno

This is an example of the artifacts on chars, still happening running a kernel
with the drm/i915 fix 'Only clear write-domains after a successful wait-seqno'.
In this case we have a completely mangled 't' in firefox.

Snapshot was taken with an handy phone so that the monitor pixel frame is
visible. In fact, it is now apparently impossible to snapshot with prtscrn. As
soon as a print screen is requested the wrong char is always redrawn correctly.

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