Comment 138 for bug 1851518

Hi jhubuntu20,

First, hopefully I can do you a solid and tell you how I fixed my brightness control at least (cause mine is a Galaxy Book2 Pro also, but with the ARC graphics).  What worked for me was:

    -Created /etc/modprobe.d/i915.conf with
        options i915 enable_dpcd_backlight=3
    - Regenerated the initramfs:
        sudo update-initramfs -u -k all

Hope that helps, unless you already tried.

On my side, I am running kernel 6.0.0-1006-oem (which I got from the linux-oem-22.04b package, as opposed to the mainline tool, which i may try though). I tried that in hopes it would help, in addition to many other things (disabling windows fast boot on my other drive, disabling secure boot and fast bios, setting probe_mask=1, iommu=off, and others).  Also tried playing with hdajackretask, because I'd be happy with retasking / giving up my working headphone jack for the speakers, but haven't figured that out.

Also, when I tried your TO912.sh script (the first thing I tried actually), I was doing it following the instructions  here -- https://forum.manjaro.org/t/howto-set-up-the-audio-card-in-samsung-galaxy-book/37090
This includes also blacklisting snd-hda-intel, removing alsa-conf, plus more.  Should I not be doing that?  (I've tried both ways though).

The problem is I just don't have the right mental model for what's going on, so trying everything too blindly... but I'm trying to understand more.  Most things have no effect (i.e., headphones work, speakers don't).  However, the one tweak that has made the most effect is:

    options snd-intel-dspcfg dsp_driver=##

    - When I set this to "3", or leave the setting out (i.e., as it was on fresh install), alsamixer shows "sof-hda-dsp" for "Card" and "Realtek ALC298" for "Chip".  When I use hdajackretask, it hangs completely when applying the retasking (and I've stopped pulseaudio, etc.), and the machine will hang on next shutdown.
    - But if I set it to "1", alsamixer then shows "HDA Intel PCH" for "Card", and still "Realtek..." for chip.  I can use hdajackretask without it hanging up.  And when I plug in headphones, I see a new "Headset or Headphone" GUI popup.  But my mic doesn't look like it's working. (Also, I need to not blacklist snd-hda-intel for this config to work, otherwise I only have "Dummy Output")

Do you happen to know which of those situations seems "more right"?  I fear that there's more than one problem going on at once, and I wonder which setting (3 vs 1) I should use as I experiment with the other possibilities (your script, etc.)

Lastly, I notice if I look in alsa-info, its reporting "line_outs=1", but "speaker_outs=0" in almost all configurations, and its not binding either line_out or speaker to anything in "/devices" (though it is binding the HDMIs, headphone, and sometimes the Mic).  I checked my older laptop, however, which has speaker sound, and it reports the same (though its running a 4.xx kernel and the ALC256).

I don't know if any of this gives any clues, and I apologize for my posts length and poor formatting.. I'm just trying to make sense of all this.