@Andy, as stated, this is not a change in behavior-- maverick had the
same problem of not spinning the fan high enough (only 4500rpm) when
temperatures were particularly high. The difference between maverick and
natty is that maverick tends to run ~8C cooler so you hit the critical
100C shutdown less frequently (but still hit it).
The BIOS/EC should be handling this, and indeed it does adjust the fan
speed between 0 and 4500rpm just fine. The problem is that it doesn't
spin up the fans to a fast enough speed (they are capable of ~6500rpm)
when under very high temperatures. Also, when Advanced Thermal
Management in the BIOS is set to 'Maximum Performance' (the apparent
default for this machine when on AC) the problem is especially
aggravated since frequency scaling doesn't seem to occur. When Advanced
Thermal Management is set to 'Balanced' (the default when on battery),
cpu frequency scaling does occur, which helps with overheating but there
are still cases where the CPUs are at their lowest frequency and the
fans at their BIOS/EC maximum speed (ie 4500rpm) where the temperature
still goes up and you hit 100C.
I have an up to date BIOS/EC according to the Lenovo website. The
'Maximum Performance' vs 'Balanced' might be as designed, but clearly
there is a problem when the lowest cpu frequency and the highest fan rpm
in the default install is not enough to keep the machine from hitting
100C. While the fix should probably be with Lenovo, perhaps there is
something we could do in the driver when i7s hit 85C we should spin up
to level 7 (otoh solution).
** Changed in: linux (Ubuntu Natty)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/751689
Title:
Thinkpad x201* overheats due to slow fans when on 'auto'
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