Comment 45 for bug 370173
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| arsenix (arsenix) wrote Re: Ubuntu 9.04 laptop overheat and shutdown | #45 |
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0f7b58d
(Get the code!)
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