Severity of ACPI Error Message from _SRS

[Alex Hung]

Hi,

It is found that kernel generates ACPI error messages on AMI's BIOS's 
implementation when kernel executes _SRS messages, as the launchpad bug 
below

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1076979

Apparently kernel follows ACPI specification but BIOS did not handle it 
correctly; however, the error messages has not caused function failure 
so far.

Some facts:
1. It is only seen on AMI's BIOS
2. S3, S4, and reboot failures are not related to this errors so far.
3. It only happens on super I/O devices, i.e. LPT (for printer port) and 
UART (for serial port) that reside in LPC bridge.
4. _SRS method is optional.
5. BIOS usually configures LPT and UART, if presents, during *POST* time.
6. We haven't seen LPT or UART failures even when the ACPI errors are 
presents.

For longer term, it is needed to feedback BIOS vendor to have this fixed.

For now, the failures are marked as CRITICAL. It is suggested that we 
may lower it to HIGH or MEDIUM. I personally think it is not a bad idea 
for the reasons above.

Any thoughts?

Cheers,
Alex Hung