| What | Removed | Added |
|---|---|---|
| CC | grmat@sub.red |
Comment # 22
on bug 106175
from grmat@sub.red
Created attachment 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 stuttering 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=quebec.jpg&pps=960&pursuit=0&height=0 having hardware acceleration force-enabled and also showing fps/frametime graphs. The web page has continuous movement, ensures that there is a screen update every 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 moving a third window around. Firefox stutters as hell (suspecting vsync stuttering) and the graphs show that as well. Disabling DC resolves the issue completely and the bottom scenario would look 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 stuttering desktop with DC enabled.
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