I also tried to disable DRI using the following xorg.conf:
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "DRI" "off"
EndSection
But this causes the screen to freeze mainly immediately. With the
default (no xorg.conf at all) it only sometimes freezes.
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Xorg hangs on Intel Core i5 (Intel HD4500)
https://bugs.launchpad.net/bugs/574336
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