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KWhat
l33t
Joined: 04 Sep 2005
Posts: 647
Location: Los Angeles
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 Posted: Sun Sep 15, 2013 6:09 pm Post subject: Overclocking Patches |
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| The linux kernel really doesn't like overclocking and seems to panic if there is a cpu thermal event. Does anyone know if there is a patch set to prevent halts due to thermal events? |
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eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9678
Location: almost Mile High in the USA
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| Posted: Sun Sep 15, 2013 7:49 pm Post subject: |
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My i5 gets thermal events frequently but does not panic.
What CPU and exactly what events show up?
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Mon Sep 16, 2013 12:41 am Post subject: |
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Undervolt, to help keep the CPU cool. Here's how:
For an Intel CPU, get phc-intel-pack-rev11.tar.bz2, Then in the "inc" dir, go to dir for your kernel, and get a single patch.
Edit: Bah, URL above is a dead link, so here's PHC releases thread.
Apply the patch (to drivers/cpufreq/acpi-cpufreq.c), just before compiling a kernel, like this:
| Code: | | patch -d drivers/cpufreq -Np0 -i $PATCH_DIR/linux-phc-0.4.0.patch |
A little undervolt startup script I've just started using:
| Code: | DEFAULTS="41 35 23 19"
VIDS="27 27 14 10"
if [[ `cat /sys/devices/system/cpu/cpu0/cpufreq/phc_default_vids` != $DEFAULTS ]] ; then
echo "Unexpected defaults - will not undervolt!"
exit 1
fi
# Have to apply to all cores
for cpu in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids ; do
echo $VIDS > $cpu
done |
You have to experiment, to find the low-but-still-stable values. The first number in $VIDS, which applies to the highest performance state, is the most important to make low, because that produces the most heat.
My laptop runs hot, and this tweak helps with (but does not completely fix) the CPU's thermal throttling 
Last edited by PaulBredbury on Wed Feb 26, 2014 8:48 pm; edited 4 times in total |
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Jaglover
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Joined: 29 May 2005
Posts: 8291
Location: Saint Amant, Acadiana
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Kernel & Hardware
