It looks like the nouveau driver may be interfering. Try blacklisting it
and see if that helps. Use these commands and then restart
echo "blacklist nouveau" | sudo tee -a /etc/modprobe.d/blacklist-nouveau.conf
sudo depmod -a
** Changed in: xorg (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1074779
Title:
llvmpipe used after clean install instead of intel
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