acpi error at boot lenovo

[Arjun Kalesh]

[ 0.700035] ACPI BIOS Error(bug): Could not resolve symbol [\_SB.PR00._CPC],
AE_NOT_FOUND (20210730/psargs-330)
[ 0.700080] ACPI Error: Aborting method [\_SB.PR00._CPC due to previous error
(AE_NOT_FOUND) (20210730/psparse-529)
[ 0.700291] ACPI BIOS Error(bug): Could not resolve symbol [\_SB.PR00._CPC],
AE_NOT_FOUND (20210730/psargs-330)
[ 0.700312] ACPI Error: Aborting method [\_SB.PR02._CPC due to previous error
(AE_NOT_FOUND) (20210730/psparse-529)
[ 0.700455] ACPI BIOS Error(bug): Could not resolve symbol [\_SB.PR00._CPC],
AE_NOT_FOUND (20210730/psargs-330)
[ 0.700479] ACPI Error: Aborting method [\_SB.PR03._CPC due to previous error
(AE_NOT_FOUND) (20210730/psparse-529)
/dev/sda3: clean, 397151/9568256 files, 10812539/38268672 blocks
[ 9.931982] irq 9: nobody cared (try booting with the "irqpoll" option)
[ 9.932981] handlers:
[ 9.933298] [<00000000f6294bf8>] acpi_irq
[ 9.933864] Disabling IRQ #9
[10.574495] mtd device must be supplied (device name is empty)
[21.221198] mtd device must be supplied (device name is empty)
[24.508318] mtd device must be supplied (device name is empty)
[36.123767] ACPI BIOS ERROR (bug): Could not resolve symbol [\_TZ.ETMD], AE_NOT_FOUND (20210730/psargs-330)
[36.123852] ACPI Erroe: Aborting method \_SB.ITEM.OSC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)

[Alex Murray (alexmurray)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Ivan Hu (ivan.hu)]

For \_SB.PR00._CPC (AE_NOT_FOUND) issue, this seems the issue that some ssdt table won't be loaded that causes the \_SB.PR00._CPC cannot be found but used. This has been fixed after kernel 5.19, maybe you could try on that.