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[Bug 1766048] Re: Tearing / sluggish desktop since recent 18.04 update with AMD hardware


Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubuntu-gnome-meta (Ubuntu)
       Status: New => Confirmed

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  Tearing / sluggish desktop since recent 18.04 update with AMD hardware

Status in ubuntu-gnome-meta package in Ubuntu:

Bug description:
  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

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