Fixing Stuff After Upgrading to Fedora 34

I upgraded to Fedora 34 and experienced some difficulties. This is mostly a dump of things I changed, so I can remember.

USB Sound Device not Detected Properly

I use a USB audio device but I could not get it to run properly. The solution was to remove UDEV rules as suggested as a workaround in a pipewire ticket. The rules are located in the file /lib/udev/rules.d/90-pipewire-alsa.rules, so I removed it.

Monitor Looses Signal Frequently

I use an integrated Intel GPU and a monitor connected via HDMI. Errors like CPU pipe B FIFO underrun were logged. The solution was to add the kernel parameter i915.enable_dp_mst=0. In Fedora 34, grubby shall be used to add kernel parameters, so I executed grubby --update-kernel=ALL --args=i915.enable_dp_mst=0.