Massive slowdowns/lags in plasma, potentially related to amdgpu, no errors, no logs, no indicators
For 3 months now I've been struggling with a problem, where sometimes my NIC would drop connection. I swapped to a PCIe NIC (actually I tested 3 other NICs), but the only thing that changed was that instead of dropping connection, the whole system would slow down, have massive lags/stutters and in terms of connection, the ping response times would skyrocket. Tried changing NIC buffers, no luck. THIS IS NOT NETWORKING ISSUE.
This was happening on Mint 22.1, Fedora 41, Fedora 42 Beta, Aurora and now Bazzite.
I absolutely ruled out any problems with my network - all cables were changed, tested 3 routers, 2 switches, tested the same cable with 4 other devices (2 laptops, SteamDeck and MacBook). THIS IS NOT NETWORKING ISSUE.
I've tested unplugging all USB devices, messing around with IOMMU, power states in BIOS, tried disabling problematic modules (
r8169, wl and mt7921e). No luck.
The only thing that persists now is my GPU. I've noticed that during slowdowns, a kworker/##:#-events would climb to the top of the top (hehe), while not actually hogging any resources. Followed this rabbit hole, and found:
https://bbs.archlinux.org/viewtopic.php?id=299561
https://community.frame.work/t/kworker-events-unbound-stuck-at-100-cpu-laptop-slows-to-1-fps/63464
https://gitlab.freedesktop.org/drm/amd/-/issues/3647
All of these mention setting kernel module argument amdgpu.dcdebugmask=0x10, which seems to fix this issue for everyone.
Tried using rpm-ostree kargs --append-if-missing="amdgpu.dcdebugmask=0x10. During boot I can see, that this is appended to LINUX_CMDLINE in Grub, and does show up in dmesg, as seen here:
EDIT:
The dcdebugmask actually is setting properly and disabling PSR, so something other's at play...
Can somebody help me?Framework Community
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