Comment # 5 on bug 1207837 from David Anes

Same here, I get the same error. The last working kernel was 6.0.x but since
the jump to 6.1.x monitors do not wake up after suspend (or during startup)
and/or act strangely.

I noticed the following issues:
* During BIOS POST, only the laptop monitor is used (previously, all other
monitors were displaying the bootup process).
* After waking up from suspend, external monitors do not wake up (as Jiri
mentions).
* Even when the monitors work (using the workaround Jiri mentions, plugin the
dock after the boot and not suspending the machine) the monitors are mixed
together (for example, I try to rotate the image in one monitor and another one
is rotated instead, like the monitors are mixed together).

Today I wanted to revert back to 6.0.x kernel, but unfortunately it's not there
any more in GRUB's menu (seems it's been purged by the kernel-purge-service).
As it's not available, I tried the one from Takashi's home at
https://download.opensuse.org/repositories/home:/tiwai:/kernel:/6.0/standard/
but I cannot boot that kernel.

Previously I was able to boot into 6.0 and everything was working, but I'm not
sure how to know the changes that are relevant to do a bisect neither how to
make the latest version for kernel 6.0 kernel from Takashi's repo.

Any hint?