Comment # 5
on bug 106175
from Mariusz Ceier
amdgpu.dc=1 also causes performance issue with 2 games I own: "Rise of the Tomb Raider" and "Helium Rain" (UE4 game with sources publicly available on github). I have 2 monitors (1st is 60Hz, 2nd in 144Hz). During tests I was using 1920x1080 resolution in both games which is 60Hz on both monitors. 1. With amdgpu.dc=0 everything is fine. 2. With amdgpu.dc=1: The issue was showing up only in menus when cursor was visible and was in the game window e.g. when Helium Rain was running on 2nd monitor (fullscreen) and I was moving mouse over its window - mouse was lagging/stuttering/not responding and Xorg server was producing messages like below in Xorg.0.log: (II) event5 - USB Gaming Mouse: SYN_DROPPED event - some input events have been lost. (EE) client bug: timer event5 debounce short: offset negative (-7ms) When I moved mouse to the 1st monitor the messages were not produced and mouse was not lagging. I tried few things (including switching from full dyntick system to idle dyntick) until finally MrCooper at #xorg-devel suggested trying amdgpu.dc=0 which fixed the issue. With amdgpu.dc=1 latencytop was showing that drm_modeset_backoff was taking ~20ms. I was using kernel 4.17.0-rc1 and 4.17.0-rc2, Mesa 18.2.0-devel (git-d136a5fad9) and X.Org X Server 1.19.99.904 (1.20.0 RC 4) with xf86-video-amdgpu and radeonsi. I'm using 1000Hz gaming mouse.
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