Comme=
nt # 22
on bug 10617=
5
from grmat@sub.red
Created attachmen=
t 140858 [details]
GALLIUM_HUD showing stuttering
I can confirm the issue.
Having a Radeon R9 290X (Hawaii XT), DC introduces heavy stuttering on a
composited X desktop while interacting with the window manager. This stutte=
ring
can't be resolved by forcing high power states.
Attached is a screenshot to give an impression of the stuttering.
Top left is the GALLIUM_HUD with the compositor's frame rate and frame time
graph. On the right, there is Firefox with the page
https://testufo.com/photo#photo=3Dquebec.jpg&=
;pps=3D960&pursuit=3D0&height=3D0 having
hardware acceleration force-enabled and also showing fps/frametime graphs. =
The
web page has continuous movement, ensures that there is a screen update eve=
ry
frame and makes it easy to detect stutter.
This looks perfectly fine and the graphs represent that as well.
On the bottom there is the same setup but while changing window focus or mo=
ving
a third window around. Firefox stutters as hell (suspecting vsync stutterin=
g)
and the graphs show that as well.
Disabling DC resolves the issue completely and the bottom scenario would lo=
ok
and feel the same as the upper one with DC.
In this current situation, I could disable DC and have a smooth desktop at =
the
cost of several dozens of watts idle power or save power and use a stutteri=
ng
desktop with DC enabled.
![https://testufo.com/photo#photo=3Dquebec.jpg&= ;pps=3D960&pursuit=3D0&height=3D0](3D"https://testufo.com/photo#photo=3Dquebec.jpg&pps=3D960&p=){kind=link}