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


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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
Radeon Pro WX7100
LG 38UC99 monitor (3840x1600 res).

Description:	Ubuntu Bionic Beaver (development branch)
Release:	18.04

** Affects: ubuntu-gnome-meta (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment
Tearing / sluggish desktop since recent 18.04 update with AMD hardware
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