I encountered an issue after advising you that 18.04.3 works. Perhaps it sheds some light on the problem.
It occurred to me that perhaps there is a graphics issue and that part of what I was seeing is contamination of the background image I was using. So I tried to open "Settings" in order to revert to the default image. Didn't work; that is, "Settings" doesn't work. No response. I can click on "Settings" on either toolbar or try to access it through "Show Applications" and no response. What's more, after getting no response there, other stuff is locked out and doesn't respond. I have to reboot to get functionality back. In getting to reboot, the shutdown process does report that anything I've tried to open or start, after trying to reach "Settings", isn't responding, and then it hangs. If I click on "Power down" again at that point, it doesn't, it just puts up an image and stalls (the image it displays is the background image I've been using, without the toolbars and the contaminant artifact!). At that point, I've just hit the power switch. I've not tried "Ubuntu on Wayland" or the test kernel package. I'll see what happens there. I can boot into the prior Linux generic via grub; haven't tried to pull up any apps there, but the image issue was still there. On 1/22/20 12:43 AM, Daniel van Vugt wrote: > OK, thanks. Assuming the bug isn't just hiding and wouldn't reappear > later in 18.04.3 if used long enough, then this implies a fix exists > somewhere in the HWE packages (which are the difference between 18.04 > fully updated and 18.04.3 fully updated). > > The only two sets of HWE packages I can think of that affect graphics > are Xorg and the kernel. > > Firstly Xorg: Does the bug occur if you log into "Ubuntu on Wayland" > instead? > > Secondly the kernel: Does the bug occur if you install the latest test > kernel packages from here? https://kernel.ubuntu.com/~kernel- > ppa/mainline/v5.5-rc7/ Remember to run 'uname -a' to check which kernel > is active. > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1860483 Title: [nouveau] screen background overlaid with scan type artifact in red To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1860483/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
