Comment # 5 on bug 1221734 from Takashi Iwai

Thanks!  Interestingly, through a quick glance, there is no obvious changes in
the relevant code (either in Realtek WiFi driver or wireless net code).

Is the problem reproducible reliably, and can switching the kernel between
those versions confirm the first bad kernel?  If yes, you can try the
following:

- Rename the first broken kernel modules:
    cd /lib/modules/5.14.21-150400.24.74-default/
    mv kernel kernel.dist
- Copy the last good working kernel modules to there:
    cp -a /lib/modules/5.14.21-150400.24.69-default/kernel
/lib/modules/5.14.21-150400.24.74-default/
    depmod -a 5.14.21-150400.24.74-default
    dracut -f --kver 5.14.21-150400.24.74-default

Then retest 5.14.21-150400.24.74-default.  There can be some hiccups, but the
only interesting thing is the test of this bug.  If the bug still appears after
this, it means that the code built in the kernel got some bugs.
OTOH, if this "fixes" the issue on *-74, it means some of the copied modules
received the fix.  Then you can go back to the original modules, and try to
copy some of them, and identify which module are affected.