Frametime Spikes Regardless of Hardware Load
Since moving to Bazzite from Windows 10 I have been noticing frametime spikes regardless of the game I've been playing.
At their gentlest they look more like bumps on the frametime graph and are consistently spaced out, normally there are one or two spikes every few seconds, even when motionless. I haven't been able to determine a rhyme or reason. It happens with Quake (remastered), Half-Life 2, Doom (2016), Doom Eternal, etc.
I've tried multiple resolutions and graphical settings, RADV_PERFTEST flags, turning down my mouse's polling rate, and used LACT to max out my hardware clocks. The framerate is otherwise stable aside from the spikes. A particularly acute case I noticed had big spikes occur when I swept my mouse back and forth in Quake, with somewhat similar behavior in Half-Life 2. Curiously for Half-Life 2, when I cranked up my GPU clockspeed, there were fewer spikes, but they were high and lasted longer. Mangohud also always seems to say my GPU is running between 60% - 70% utilization regardless of what is on screen.
On Windows I didn't have this issue, I remember playing through Half-Life 2 when the anniversary update came out and marveled at how buttery smooth it was the whole time.
I'm running out of ideas for troubleshooting and QuakeCon is coming up. I'd appreciate any insights or suggestions.
