Comment 18 for bug 1874698

[ 14.652221] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 0x0
This message is common on all machine with sof driver, so we could ignore it.

According to dmesg in the #15, the kernel driver already worked. you could run "aplay -l" to check (sorry, not alsa -l).

So after update the Hdmi.conf, your audio should work. and there is no errors anymore in the dmesg of #17. I have no idea why it stuck at a black screen.

-25 kernel is based on the ubuntu 5.4.0-25-generic kernel, so it lacks the fix in the -26 kernel, maybe the brightness adjustment fix is in the -26 kernel.

So if you restore the Hdmi.conf, your -25 kernel could login?