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Description of problem: I have Lenovo Edge E520 with Sandy Bridge architecture and two switchable GPUs, integrated Intel and discrete ATI. I'm using kernel feature vgaswitcheroo (http://en.gentoo-wiki.com/wiki/Vga_switcheroo) to switch off discrete GPU. And my laptop is overheating. I have discovered that my laptop fan isn't working, because Linux kernel is reading temperature of whole notebook from thermometer that is on discrete GPU, even when I switch that GPU off. Then system thinks that my laptop has about 30 degrees celsius (even when it has 80 degrees) and it doesn't start my laptop fan. It is very bad, because overheating can possibly lead to shortening the lifespan of components. This bug is documented on other distros (http://ubuntuforums.org/showthread.php?t=1900942) and even other operating systems (http://forums.lenovo.com/t5/ThinkPad-Edge/E520-Fan-sometimes-not-working-after-switchable-graphic-issue/td-p/586829/page/4) as well. I think that it's not hardware problem, because when I switch off discrete GPU in BIOS, temperature is right and fan works as expected. How reproducible: I think that it is easily reproducible on laptops with two (hybrid) GPUs (at least on Edge E520). Steps to Reproduce: 1. Get Lenovo Edge E520 (not sure if it is problem with all hybrid GPUs) 2. Switch off discrete GPU (with vgaswitcheroo) 3. Do some work with it. It will overheat. Fan will not work. Actual results: Fan doesn't start even if the whole laptop has ~80 degrees celsius. Expected results: Fan would start spinning when the laptop reaches ~40 degrees celsius and cool it down.
Dave and Matthew, is there anything that can be done here?
Please install the pmtools package and run (as root) acpidump and attach the output.
Here is dump when the discrete GPU is on: http://fpaste.org/SiAi/ and here when it's off: http://fpaste.org/hDOR/
[mass update] kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository. Please retest with this update.
Created attachment 612359 [details] acpidump with kernel-3.5.3-1.fc17.x86_64
this lack of fan speed seems to happen on occasion not sure why but seems to have gotten worse after some recent updates but not sure which. http://www.smolts.org/client/show/pub_d71dc9ab-d675-4ee2-a9a9-303efc25df83
To [NEEDINFO] - yep, it still doesn't work.
# Mass update to all open bugs. Kernel 3.6.2-1.fc16 has just been pushed to updates. This update is a significant rebase from the previous version. Please retest with this kernel, and let us know if your problem has been fixed. In the event that you have upgraded to a newer release and the bug you reported is still present, please change the version field to the newest release you have encountered the issue with. Before doing so, please ensure you are testing the latest kernel update in that release and attach any new and relevant information you may have gathered. If you are not the original bug reporter and you still experience this bug, please file a new report, as it is possible that you may be seeing a different problem. (Please don't clone this bug, a fresh bug referencing this bug in the comment is sufficient).
With no response, we are closing this bug under the assumption that it is no longer an issue. If you still experience this bug, please feel free to reopen the bug report.