Ok, found the culprit, for some reason LIBGL_ALWAYS_SOFTWARE was set to 1, apparently, this tells Ubuntu to use the LLVM renderer. The article below says this is sometimes set when the GUI does not work correctly or crashes. I have been lately been switching between Wayland and Xorg, and had a couple of crashes in Wayland, so maybe it happened on one of those occasions. This is pure speculation on my part.
I found the solution at https://askubuntu.com/questions/908381/desktop- stuck-on-software-rendering-libgl-always-software- set?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa Basically, type systemctl --user unset-environment LIBGL_ALWAYS_SOFTWARE and reboot, then glxinfo and system settings report the correct UHD renderer is being used ;-) Not sure if I should close the bug or not, this is a fix but no idea why LIBGL_ALWAYS_SOFTWARE was set to 1. I am happy to collaborate if anybody wants to investigate it, otherwise, I am also happy if somebody wants to close it. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1768497 Title: Upgrade from 17.10 to 18.04 lost native 3D hardware acceleration for intel UHD 620, laptop is XPS 9370 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1768497/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
