http://bugzilla.kernel.org/show_bug.cgi?id=5534
------- Additional Comments From [EMAIL PROTECTED] 2006-01-26 14:14 -------
This bug can be worked around by patching the DSDT (at least for me).
The two changes I have done:
1. Enabling thermal zone polling by adding a _TZP method for the main thermal
zone.
2. In the _ON method of power resources associated with the fan (C25C to C25F),
there is code that seems to check the host OS:
Method (_ON, 0, NotSerialized)
{
If (LNot (LGreater (\C008 (), 0x03))) /* OS != WinXP */
{
C256 (0x08, 0x32)
}
Else /* OS == WinXP */
{
If (LGreater (DerefOf (Index (C252, 0x00)), C258 (C248,
0x00)))
{
C256 (0x08, 0x32)
}
}
}
For some reason (bug or feature?), Linux is identified as Windows XP.
This causes another check involving the current temperature and a trip point to
be made.
Removing both checks and calling C256 directly seems to fix the problem of fan
refusing to start blowing after a random amount of time (as reported in comment
#27).
What I still don't understand is why the temperature check did fail after some
time, causing the fan not to restart. Could this be a synchronization issue like
a race condition?
This does not solve the problem of not-proceeded ACPI events, though.
The patched DSDT for BIOS F.09:
http://acpi.sourceforge.net/dsdt/view.php?id=525
And for BIOS F.0D:
http://acpi.sourceforge.net/dsdt/view.php?id=561
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