Bug#1114884: linux-image-6.1.0-39-amd64: AMD Ryzen 9 7950X,,, linux-image-6.1.0-39-amd64 hangs on boot while 6.1.0-37-amd64 works fine

[Chris Mair <chris@1006.org>]

> Does pressing Alt+PrtSc+t result in some output on the console?
> (alternatively: 
> 
> echo t > /proc/sysrq-trigger
> 
> ) result in any output on the screen? What about
> 
> echo "Debian is great" > /dev/tty1
> 
> ?


Hi Uwe,

tried all three, nothing changes the stuck screen as shown on the attached VGA monitor:

- `echo t > /proc/sysrq-trigger` doesn't show on the monitor, but shows debug log correctly in the dmesg output,

- `echo "Debian is great" > /dev/tty1` doesn't show on the monitor,

- pressing Alt+PrtSc+t doesn't show on the monitor and logs 'sysrq: This sysrq operation is disabled.' in the dmesg output.


Please excuse if I repeat information:

The kernels that works fine (up to 6.1.0-37-amd64), show the boot log and then at some point visibly change the screen resolution, the font gets visibly thinner, the screen is cleared and the text-login prompt appears.

Later kernels (from 6.1.0-39-amd64 and what I'm using right now 6.1.0-40-amd64) freeze the screen at exactly the
moment that switch occurs.

To me, it looks like whatever that switch does, just completely freezes screen output. But, what was logged up to
that point stays on screen indefinitely (as in the photo). It's not that the screen blanks because somehow the VGA signal
is wrong or lost, it keeps on showing that last screen content frozen in time.


Thanks and Bye,
Chris.