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maiku
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Joined: 24 Mar 2004
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Location: Escaping from NY
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 Posted: Sat Apr 24, 2010 7:53 am Post subject: [solved] Overworking laptop fans |
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Recently I bought a Dell Studio 1537 laptop which had Windows 7 on it for a day before I put Gentoo on it. When I was using it on Windows 7 the fans were pretty quiet. However when I put Gentoo on it the fans continually spin pretty darn fast despite being idle with only 16 processes running and on ondemand CPU scaling.
Did I miss a fan control option somewhere or are these some legitimate heating problems going on here. I doubt dust collected in the fans in the day that I've had it...
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Michael
Last edited by maiku on Sun Apr 25, 2010 7:51 am; edited 1 time in total |
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pianosaurus
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Joined: 19 Apr 2004
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| Posted: Sat Apr 24, 2010 10:38 pm Post subject: |
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Check that the CPU is actually running at a low frequency, and that the temperature is not actually too high. Here's what I have under moderate load (completely different machine, though):
| Code: | # grep MHz /proc/cpuinfo
cpu MHz : 800.000
cpu MHz : 800.000
# cat /proc/acpi/thermal_zone/*/temperature
temperature: 55 C
temperature: 48 C
temperature: 43 C
temperature: 45 C
temperature: 28 C
temperature: 50 C |
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maiku
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Location: Escaping from NY
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| Posted: Sun Apr 25, 2010 12:49 am Post subject: |
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When I start up the machine to when it is in heavy load, this is all I get:
| Quote: | # cat /proc/acpi/thermal_zone/*/temperature
temperature: 27 C
temperature: 0 C |
The CPUs when idling are | Quote: | # grep "MHz" /proc/cpuinfo
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000
cpu MHz : 933.000 |
When I start up the machine it's silent. Then the fan gets louder and louder until it's quite audible.
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maiku
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Location: Escaping from NY
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| Posted: Sun Apr 25, 2010 7:52 am Post subject: |
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The fans function as normal when X is loaded with the fglrx driver. I'm not sure why, but it works.
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Michael |
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pianosaurus
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| Posted: Tue Apr 27, 2010 3:03 pm Post subject: |
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In that case, it seems it's not your CPU that is running hot, but your GPU. It probably has its own fan. I have switched to the open source drivers, so I can't check this, but I seem to remember the ati drivers ship with a tool you can check GPU temperatures with. Something like aticonfig --pplib-cmd "get temperature 0"?
Actually, it's probably not running hot at all, but the system doesn't know that until the driver is loaded.
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maiku
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| Posted: Wed Apr 28, 2010 2:43 am Post subject: |
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It returns something like | Quote: | | Temperature for thermal controller 0 is 50.500000 |
which in fact is much hotter than the CPU.
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Michael |
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