Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
I have Installed bullseye (clean install).
After installation I have installed firmware for nvidia graphics card. Rebooted the
system. Tried to suspend to ram, screen goes black but power is still on.
I cannot rebbot the system or X. I have to use hardware reset.
After this I have installed Nvidia legacy driver from the Debian repository,
rebooted the system, and everything is working fine.
Conclusion: there is a bug in nouveau driver.
*** End of the template - remove these template lines ***