On Wed, 2023-03-29 at 10:27 +0100, Ralph Corderoy wrote: > https://wiki.archlinux.org/title/PC_speaker "More recent motherboard models omit the POST beep in favor of rapidly booting into the OS." I'll take a look at the used "boot speed". This mobo has got several options. I don't remember what option I selected. However, maybe there is a kind of "random speed" option, that let the Buzzer sometimes beep and sometimes not and in addition the pcspkr module might be obsolete. Maybe the Buzzer only can be used for the POST, but not by Linux anymore. Since CSM depends on the used GPU nothing seems to be too absurd to be impossible.
