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:
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.
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 (0x00007fe67e63 3000) lib/libGLX. so.0 (0x00007fe67dcc d000) lib/libGLdispat ch.so.0 (0x00007fe67da1 6000)
libGLX.so.0 => /usr/local/
libGLdispatch.so.0 => /usr/local/
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.