Kde plasma freezes unexpectedly

[kecmen79]

Hi,

I have Kubuntu 22.04.2 LTS. Last few weeks KDE started to 'freeze' occasionally. Is this a known issue? Is there any way how I can gracefully close/restart just the UI from terminal?
But most important, what should I check to collect some usefull logs or details that could help to determine the cause of the problem?

Detailed description:
KDE just gets stuck and I can not do anything in the graphical UI. It seems that this usually happens when i switch desktops or even windows on the same desktop (but I cannot reproduce). I can move the mouse cursor, the music is still playing in the background (clementine - and I can control it via keyboards shortcuts), I can log in to the console using Ctrl+Alt+F1, I can log in via SSH... But I can not control KDE anymore - I can not move windows, switches desktops, close windows, opening apps or anyting similar. Once this happened during skype call and the call was not interrupted and i was able to communicate.
This started to happen only few weeks ago, it hasn't been happening before. I haven't installed any new hardware lately.

Technical details that might be relevant:

root:~# cat /etc/issue
Ubuntu 22.04.2 LTS \n \l

root:~# uname -a
Linux ryzen 5.19.0-32-generic #33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 30 17:03:34 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
root:~#
root:~# kf5-config --version
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Qt: 5.15.3
KDE Frameworks: 5.92.0
kf5-config: 1.0
root:~#
root:~# lshw -c display
*-display
description: VGA compatible controller
product: Navi 14 [Radeon RX 5500/5500M / Pro 5500M]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:0d:00.0
logical name: /dev/fb0
version: c5
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom fb
configuration: depth=32 driver=amdgpu latency=0 resolution=1920,1080
resources: irq:144 memory:d0000000-dfffffff memory:e0000000-e01fffff ioport:f000(size=256) memory:fcd00000-fcd7ffff memory:c0000-dffff
root:~#
root:~# lshw -c processor
*-cpu
description: CPU
product: AMD Ryzen 9 3950X 16-Core Processor
vendor: Advanced Micro Devices [AMD]
physical id: 11
bus info: cpu@0
version: 23.113.0
serial: Unknown
slot: AM4
size: 2199MHz
capacity: 4761MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp x86-64 constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pc
lmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate
ssbd mba ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale
vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sev sev_es cpufreq
configuration: cores=16 enabledcores=16 microcode=141561889 threads=32

root:~# lsmod | grep -i amd
edac_mce_amd 36864 0
kvm_amd 167936 0
kvm 1130496 1 kvm_amd
ccp 110592 1 kvm_amd
amdgpu 11300864 170
iommu_v2 24576 1 amdgpu
gpu_sched 49152 1 amdgpu
drm_ttm_helper 16384 1 amdgpu
ttm 98304 2 amdgpu,drm_ttm_helper
drm_display_helper 184320 1 amdgpu
drm_kms_helper 200704 4 drm_display_helper,amdgpu
drm 581632 22 gpu_sched,drm_kms_helper,drm_display_helper,amdgpu ,drm_ttm_helper,ttm
i2c_algo_bit 16384 2 igb,amdgpu

I have 128GB of memory overclocked to 3600MHZ (but i have it like this for 3 years without an issue). Also memtest seems ok (memtester 1G 10).

Thanks for any advice

[GreyGeek]

Apparently help is on the way:
https://www.phoronix.com/news/AMDGPU-Fix-For-5.19-Bug

Meanwhile, you can try rolling back to a kernel before 5.19, like 5.15.0-67
Or, since you can access a terminal you could use
"sudo systemctl restart display-manager.service"

[kecmen79]

thanks, if that is the problem I hope it will be delivered via update quickly