I believe one aspect of this "bug" may be related to the fact that
my laptop has a single fan for both processor and GPU. My GPU seems to
stay on its "high performance" mode most of the time, possibly because I
have VirtualBox running, but I'm not exactly sure why this is.(in any
case this is the nvidia driver's responsibility) My GPU runs VERY hot
(92C as I write) and the fan does not seem to react to GPU
temperature/load. None of the 10+ temperatures reported to acpi seem to
correspond to the GPU temp reported by the nvidia tools.
There is a lot of reporting in this thread but not much
investigation. I think we first have to determine what mechanism is
actually controlling the fans on these machines. If the kernel is
controlling the fans, then it is a kernel bug. If in fact the machine
BIOS's are controlling them... then this is in fact a hardware
bug.(windows drivers may gloss over the hardware bug by overriding the
BIOS fan control) I believe that on my Lenovo T61p the fan speeds are
controlled by the hardware and not the kernel. Again it is possible
that under windows this control is overridden.
James
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Ubuntu 9.04 laptop overheat and shutdown
https://bugs.launchpad.net/bugs/370173
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