It looks like (with glamor) that adding:
Option "ShadowPrimary" "on"
is enough to work around the bug on resume.
** Summary changed:
- Resume on glamor cause GPU lockup/screen corruption on Radeon 3100 Graphics"
(ChipID = 0x9611) if some options not used
+ Resume on glamor cause GPU lockup/screen corruption on Radeon 3100 Graphics"
(ChipID = 0x9611) when shadowPrimary is off
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https://bugs.launchpad.net/bugs/1944991
Title:
Resume on glamor cause GPU lockup/screen corruption on Radeon 3100
Graphics" (ChipID = 0x9611) when shadowPrimary is off
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