I'm suspicious that the real problem is actually in the ACPI layer. From
both the posted logs:

Feb 21 01:14:59 laptop-danny kernel: [   52.010106] ACPI Error (dsfield-0140): 
[CB04] Namespace lookup failure, AE_ALREADY_EXISTS
Feb 21 01:14:59 laptop-danny kernel: [   52.010120] ACPI Error (psparse-0537): 
Method parse/execution failed [\_SB_.AMW0.WMCA] (Node ffff8800bc62b660), 
AE_ALREADY_EXISTS
Feb 21 01:14:59 laptop-danny kernel: [   52.010135] ACPI: Marking method WMCA 
as Serialized because of AE_ALREADY_EXISTS error

and:

Feb 20 17:08:11 woden kernel: [   48.383986] ACPI Error (dswload-0790): [_T_0] 
Namespace lookup failure, AE_ALREADY_EXISTS
Feb 20 17:08:11 woden kernel: [   48.383995] ACPI Exception: AE_ALREADY_EXISTS, 
During name lookup/catalog 20090521 psloop-227
Feb 20 17:08:11 woden kernel: [   48.384002] ACPI Error (psparse-0537): Method 
parse/execution failed [\_SB_.WMID.WMBA] (Node ffff88013be299c0), 
AE_ALREADY_EXISTS
Feb 20 17:08:11 woden kernel: [   48.384013] ACPI: Marking method WMBA as 
Serialized because of AE_ALREADY_EXISTS error

If someone can provide me with the DSDT / acpidump for one of the
affected laptops, I'll have a look; but this probably needs to be sent
upstream to the Linux ACPI maintainers for them to fix (i.e. this is a
bug lower down in the ACPI layer, not a bug in acer-wmi).

-- 
Konsole LAG/Freezes when Typing - Kubuntu Karmic
https://bugs.launchpad.net/bugs/443318
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