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You've only one scanout buffer which is used concurrently - the driver is responsible to keep that stuff apart.
What caused the update where you stroke the compton remark? Does it cause problems as well?
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Yeah, compton also cause similar probs (jittery screen, but no corruptions when swicthing). Compton is way more reliable than the XFCE compositor. Xcompmgr works great.
Weirdly, ATM I cannot reproduce the compton effect now. Maybe I got confused somehow and inadvertently enabled the XFCE compositor during my testing.
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Rebooted PC. Bam! Corruption returns. Also suffered another hard lock-up while trying to switch screens. I don't think it's compositor related.
For now, I'll forego screen switching, it's just too much of a hassle.
Thanks for your assistance with this seth!
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