Messages in this thread | | | Date | Fri, 11 Aug 2006 14:25:26 -0400 | From | Mark Lord <> | Subject | cpufreq stops working after a while |
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One of my notebooks (Dell Latitude X1) has a 1.1GHz Pentium-M ULV processor. This chip can change CPU speeds from 600 -> 800 -> 1100 Mhz.
I use speedstep-centrino with it, and after boot all is usually okay. But after a few hours of operation, it stops shifting to the highest frequency even under continuous 100% load (or not). Eventually it gets stuck at 600Mhz and stays there until I reboot.
Sometimes rebooting doesn't even restore it.
/sys/devices/system/cpu/cpu0/cpufreq is all very normal looking, showing the available frequencies and other info. All of the attribs there look fine, except for "scaling_max_freq", which is what seems to gradually get set smaller. For instance, right now it is set to 800000, and it won't let me change it (echo 11000000 > scaling_max_freq has no effect.
WHY? And how can I fix it?
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