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SysAdmin Blog

Intel D945GCLF2, ACPI Exception: AE_AML_INFINITE_LOOP

Alexander Bochmann Wednesday 10 of May, 2017
Another of those "just so I find my own post the next time I'm looking for this" things...

After the replacing the CPU fan on an old Intel D945GCLF2 Atom board, I "optimized" the BIOS settings by enabling automatic fan control (instead of having the fan at a fixed speed).

Currently, I have lots of messages like this in my kernel log, and a kworker thread using 100% CPU:

ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPC_.SMBR] (Node ffff88007ec3f900), AE_AML_INFINITE_LOOP (20140424/psparse-536)
ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPC_.INIT] (Node ffff88007ec3f928), AE_AML_INFINITE_LOOP (20140424/psparse-536)
ACPI Error: Method parse/execution failed [\_GPE._L00] (Node ffff88007ec35bd0), AE_AML_INFINITE_LOOP (20140424/psparse-536)
ACPI Exception: AE_AML_INFINITE_LOOP, while evaluating GPE method [_L00] (20140424/evgpe-580)

So, an hour or so of searching later, I finally hit this comment on the Novell bugzilla (cache) - and then I promptly remembered that I used to have known about this problem, and that it was exactly the reason why the fan was set to a fixed speed:

Quote:
In BIOS I have DISABLED auto fan speed. It is now set at 90%. It seems to have fixed it