Comment # 29 on bug 1198565 from Daniel Becker

I did the test, and as expected the error is still present:

uname -a
Linux quippy 5.19.0-rc5-1.g59940d4-default #1 SMP PREEMPT_DYNAMIC Mon Jul 4
07:52:48 UTC 2022 (59940d4) x86_64 x86_64 x86_64 GNU/Linux

sudo dmesg | grep "BIOS Error"
[    0.470643] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PR00._CPC], AE_NOT_FOUND (20220331/psargs-330)
[    0.470697] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PR00._CPC], AE_NOT_FOUND (20220331/psargs-330)
[    0.470740] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PR00._CPC], AE_NOT_FOUND (20220331/psargs-330)
[    0.470780] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PR00._CPC], AE_NOT_FOUND (20220331/psargs-330)
[    0.470819] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PR00._CPC], AE_NOT_FOUND (20220331/psargs-330)

plus now new:
sudo dmesg | grep "blacklist"
[    0.366925] Key type blacklist registered
[    0.638844] blacklist: Problem blacklisting hash (-13)
[    0.638865] blacklist: Problem blacklisting hash (-13)
[    0.638919] blacklist: Problem blacklisting hash (-13)
[    0.638964] blacklist: Problem blacklisting hash (-13)
[    0.639022] blacklist: Problem blacklisting hash (-13)
[    0.639060] blacklist: Problem blacklisting hash (-13)