I had this problem, too. journalctl -b|grep glamor showed this:
/usr/lib/gdm3/gdm-x-session[2205]: (EE) modeset(0): glamor
initialization failed
which is why gnome-shell was falling back to llvmpipe. However, there
was some funny business going on with my libGL installation, because ldd
/usr/bin/glxinfo showed:
libGL.so.1 => /usr/local/lib/libGL.so.1 (0x00007fe67e633000)
libGLX.so.0 => /usr/local/lib/libGLX.so.0 (0x00007fe67dccd000)
libGLdispatch.so.0 => /usr/local/lib/libGLdispatch.so.0
(0x00007fe67da16000)
meaning I must have manually built and installed versions of libGL/X at
some point. I deleted the libGL/X libraries and the xorg folder from
/usr/local/lib and after a reboot I now have intel mesa graphics again.
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https://bugs.launchpad.net/bugs/1752938
Title:
Upgrading Ubuntu 18.04 disables GPU hardware acceleration
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