My guess is the artifacts are related to SNA, rather than to the (false)
lockup. Please test this by putting the following in your
/etc/X11/xorg.conf and then rebooting:
Section "Device"
Identifier "Card0"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection
Assuming that eliminates the corruption you're seeing, then I think this
bug report is essentially dupe to #1098828
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1121631
Title:
[g45] False GPU lockup EIR: 0x00000010 PGTBL_ER: 0x00000002 IPEHR:
0x02000000
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