ALMA 9.3 - crashes after 10 minutes


I have a strange problem here with AlmaLinux 9.3 on one of our baremetal-servers. If I remove some kernel-parameters via grubby and reboot, the server gets completely unresponsive after 10 minutes. It doesn’t write any errors while this is happening to the console or in any log. Networkconnection is lost etc. I then have to press the reset-button.

I assume it must be some “powersaving”-option somewhere.

For example I want to remove the quiet splash=quiet kernel-parameters to see what is going on when the server is booting. For this I executed:

grubby --remove-args="quiet splash=quiet" --update-kernel /boot/vmlinuz-5.14.0-362.24.1.el9_3.x86_64

I also tried to add nomodeset and consoleblank=0without success e.g.:

grubby --args="nomodeset consoleblank=0" --update-kernel /boot/vmlinuz-5.14.0-362.24.1.el9_3.x86_64

and grubby --info=ALL was/is looking OK after the changes. Still the server crashes after 10 minutes.

As soon as I revert the kernel-parameter changes, the server is stable - the screen never goes blank and I always see the login-prompt.

Any clue what this could be?