I'm also affected, this is with a Radeon VII.
The VT switching workaround can take many tries to work.
This morning, when it didn't after ~20, I found this bug and tried the
"DISPLAY=:0.0 xrandr --auto" tip via ssh. That in itself did not revive the
display, but afterwards switching VTs suddenly
I'm back to say that kernel 5.4.0-66-generic works for me again after
applying the grub default `amdgpu.dc=0` work-around mentioned above.
This is for a Radeon RX 580 if that helps.
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I can confirm I have the same issue. I've reverted the kernel back to
5.4.0-65 to temporarily solve the issue.
I have all of the logs and details posted here:
https://forums.linuxmint.com/viewtopic.php?f=59&t=343546&p=1977800#p1977800
The most important being:
Feb 25 15:46:06 meritwork-linux ker
apport information
** Tags added: apport-collected ulyana
** Description changed:
i updated today to linux kernel 5.4.0-66-generic.
since then the monitor (HDMI) remains black when switched off and on again.
this can be corrected once, if a virtual text console hasn't been used so far
by
As a workaround you can try booting with "amdgpu.dc=0"
Although I don't know if Vega supports disabling DC.
With DC disabled, the GPU cannot know if your monitor has been turned off.
Another possible solution is to use an SSH session to try to restore
your monitor, typing:
DISPLAY=:0.0 xrandr --
