http://bugzilla.kernel.org/show_bug.cgi?id=8713
Summary: No fan control on Lenovo 3000 V100 (fans always spin at
lowest speed)
Product: ACPI
Version: 2.5
KernelVersion: 2.6.22-rc7
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Fan
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: None
Distribution: Mandriva Linux Cooker
Hardware Environment: Lenovo 3000 V100
Software Environment: N/A
Problem Description: Fan control does not work on this system (an ultraportable
notebook produced by Lenovo). No matter how high the CPU load or how hot the
system gets, the fans never spin up above their minimum speed. This means that
as soon as the CPU is under full load for a few minutes (e.g. compiling
anything), the system hits the critical temperature point (100 C, it appears to
be thermal zone 1 that hits this temperature, I'm guessing that's the core
temperature of one of the processors) and automatically shuts down (it's a
kernel-triggered clean shutdown, not a BIOS triggered hard cut-out). I mark
this as high severity because it severely restricts what you can actually *do*
with the system without causing it to shut down.
More info: I talked to someone (I forget who) a few months back who thought the
fact that /proc/acpi/fan is empty is significant here, so I mention that. I did
check the DSDT, following the instructions at
http://acpi.sourceforge.net/dsdt/index.php : it contains one error, which I
corrected, but booting with the corrected DSDT does not help. It also contains
some warnings I don't know how to fix. I can provide more info on this if
necessary.
I mostly use a Mandriva kernel (actually kernel-tmb, produced by Thomas
Backlund), but I have verified that this also occurs with a clean upstream
kernel. No proprietary kernel modules are loaded. I have never observed this
working with any kernel since I bought the machine (that goes back to 2.6.17),
so I conclude that it's never worked.
Steps to reproduce: Hard part is getting hold of the same model laptop, I
guess. When you have one it's easy: just try and compile anything that takes
more than a couple of minutes. Monitor the temperature while it happens, note
that the fans don't spin up, then watch it power down in the middle of the
process.
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