No, that is not a cache coherency bug. It is very likely it is just the
lack of synchronisation on the dma-buf between the two drivers.
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Sample screen showing the bug
** Attachment added: "2013-10-11 20.15.46.jpg"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1228506/+attachment/3875059/+files/2013-10-11%2020.15.46.jpg
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which
Additional notes:
* this doesn't have anything to do with Mir, just pure X
* Kevin mentioned: its my understanding that there was (is?) a cache coherency
bug in the intel driver
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Any suggestions for workarounds appreciated. The system is hardly usable
with the external monitor (e.g. surfing on the web & scrolling).
I tried lxde desktop, it behaves the same.
Thanks!
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On the external monitor. Built-in laptop display seems to be fine.
Note: symptoms include slow-motion typing, e.g. letters appear on screen
0.5sec later than typed.
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On which display do you see the cursor artifacts?
** Summary changed:
- Frequent display artifacts, take 2
+ [prime] Frequent display artifacts, take 2
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