/srv/irclogs.ubuntu.com/2021/10/18/#ubuntu-arm.txt

waveformMekaneck, yes -- LP: #1946368 is likely the issue you're running into. It particular affects high fps monitors (which tend not to make it to the login prompt). Switching to fkms is a reliable workaround (detailed at the top of the bug); the kernel team have a partial fix but it's also an upstream issue and not completely solved yet08:56
Mekaneckwaveform: thanks. Switched to fkms and testing if it works properly. I'll keep you posted.12:15

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