Public bug reported: I did a full update of my system which has been running 18.04 since the beta 2 update and I've noticed now that the desktop feels quite sluggish. The last update I did was about 5 days ago. I'm not sure which package was the culprit as several were updated (30+).
However - I think it has something to do with Gnome. I have a 75 Hz monitor, and it seems like Gnome animations, as well as just actions like moving windows around, feel like they're rendering at a lower frame rate. There is a lot of jitter too almost like tearing. Moving the mouse cursor around feels like 75 Hz though (super smooth), as well as when I play games. Had no issues prior to running 'apt upgrade'. And I can confirm my monitor is running @ 75 Hz. I'm running the stock Ubuntu kernel currently but I did try installing the most recent stable kernel (4.16.2) and that exhibited the same issue. One thing I did notice, is that setting the flag amdgpu.dc=0 in my Grub config did fix the tearing and general lag issues with moving windows around. However, it isn't a complex fix as that instead introduced stuttering with the mouse cursor. With a fresh Beta 2 installed (no package updates) this tearing/lag issue is not present. It is also not present when using 16.04 with an updated kernel. Additionally using Wayland instead of X.org I don't notice these issues but that has the limitation effect of not being able to run at higher refresh rates in my testing. System specs: Threadripper 1950X 64 GB RAM Radeon Pro WX7100 LG 38UC99 monitor (3840x1600 res). Description: Ubuntu Bionic Beaver (development branch) Release: 18.04 ** Affects: ubuntu Importance: Undecided Status: New ** Description changed: I did a full update of my system which has been running 18.04 since the beta 2 update and I've noticed now that the desktop feels quite sluggish. The last update I did was about 5 days ago. I'm not sure which package was the culprit as several were updated (30+). However - I think it has something to do with Gnome. I have a 75 Hz monitor, and it seems like Gnome animations, as well as just actions like moving windows around, feel like they're rendering at a lower frame rate. There is a lot of jitter too almost like tearing. Moving the mouse cursor around feels like 75 Hz though (super smooth), as well as when I play games. Had no issues prior to running 'apt upgrade'. And I can confirm my monitor is running @ 75 Hz. I'm running the stock Ubuntu kernel currently but I did try installing the most recent stable kernel (4.16.2) and that exhibited the same issue. One thing I did notice, is that setting the flag amdgpu.dc=0 in my Grub config did fix the tearing and general lag issues with moving windows around. However, it isn't a complex fix as that instead introduced stuttering with the mouse cursor. With a fresh Beta 2 installed (no package updates) this tearing/lag - issue is not present. + issue is not present. It is also not present when using 16.04 with an + updated kernel. Additionally using Wayland instead of X.org I don't + notice these issues but that has the limitation effect of not being able + to run at higher refresh rates in my testing. System specs: Threadripper 1950X 64 GB RAM Radeon Pro WX7100 LG 38UC99 monitor (3840x1600 res). Description: Ubuntu Bionic Beaver (development branch) Release: 18.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766048 Title: Tearing / sluggish desktop since recent 18.04 update with AMD hardware To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1766048/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs