From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 58001] "ondemand" CPU governor never raises frequency (Dell XPS
12)
Date: Thu, 25 Sep 2014 14:31:56 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=58001
--- Comment #22 from Paul Johnson ---
Is it possible that different Intel chips respond differently? I'm running
Ubuntu 14.04 on 2 laptops and one has the problem, the other does not.
On the Dell Precision m4600 laptop, I had the chronic problem that, after
suspend, I was always stuck at 800MHZ. To fix that, I had to explicitly reset
the threshold lower. Eventually, I found a script that did it
#!/bin/bash
## https://gist.github.com/Pyppe/6028707
# default with 13.04 is 95
SCALING_FILE=/sys/devices/system/cpu/cpufreq/ondemand/up_threshold
defvalue=70
if [ ! -f "$SCALING_FILE" ]; then
echo "$SCALING_FILE not found"
exit 1
fi
limit=${1:-$defvalue}
if [[ $limit -lt 100 && $limit -gt 30 ]]; then
sudo bash -c "echo $limit > $SCALING_FILE"
else
echo "Invalid value"
exit 1
fi
However, on a Dell Latitude 6430u, I have no such problem. Frequency scaling
works without qualification, before and after suspend.
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