http://bugzilla.kernel.org/show_bug.cgi?id=11281
------- Comment #4 from [EMAIL PROTECTED] 2008-08-12 05:50 -------
Thomas tried to debug this, here is my reply:
> Hmm, relatively obvious is the Warning after resume?
> Does this only happen after suspend?
No, it happens after fresh boot, too.
> Any way to trigger this?
Do you have thinkpad x60 near you? Run two while true; do echo -n;
done loops on 2.6.27-rc2. (Or were you asking about triggering one
specific warning?)
> It seem to be some real HW accessed, at least it is
> a EC byte read for this zone's temp.
> If this is a regression then likely to be related with an EC change.
Actually, I believe that critical shutdown works as designed -- I
believe I seen it once after doing something really stupid like
leaving thinkpad on direct sun with lid closed.
I actually want to try to reproduce the shutdown on 2.6.26 after forcing fan
off.
> In the _TMP function of the first thermal zone it is likely that
> one of these two code paths is hit. 0x80 should evaluate to a temp of 128C.
> But this again depends on EC reads...
> If (Local2)
> {
> Return (C2K (0x80))
> }
>
> If (LNot (\_SB.PCI0.LPC.EC.HKEY.DHKC))
> {
> If (Local1)
> {
> Return (C2K (0x80))
> }
> }
>
> The first one is the temperature of our affected thermal zone.
> It may happen when sensors are used now, that the same temperature
> (or related values) are read from EC. While EC should always return
> sane values, maybe you get wrong ones when reading two often or
> uncoordinated?
No, this is real overheat. Readings are very consistent, and values go
to 95C range. Machine is hot, too, and fails to start after critical shutdown.
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