Thank you for your report Doug. Let's set this Incomplete pending your
check of 4.4.
** Changed in: pm-utils (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1493156
Title:
pm-suspend aborts if highest numbered CPU offline, as of kernel 4.2
Status in pm-utils package in Ubuntu:
Incomplete
Bug description:
Kernel 4.2 includes a significant commit
(87549141d516aee71d511138e27117c41e8aef68), after the patch the files
and directory are present even if the CPU is offline. If the CPU is
offline, writing to those files isn't allowed and so the echo in
94cpufreq fails.
If the failed echo is not the last pass through the loop, then
the bad exit code gets overwritten with a good one before
the loop exits. If the failed echo is the last pass through the loop, due to
the highest numbered CPU being offline, then then 94cpufreq returns an error
code and pm-suspend aborts.
So what is needed is something like (and this doesn't actually work
yet):
hibernate_cpufreq()
{
( cd /sys/devices/system/cpu/
for x in cpu[0-9]*; do
# if cpufreq is a symlink, it is handled by another cpu. Skip.
[ -L "$x/cpufreq" ] && continue
gov="$x/cpufreq/scaling_governor"
# if we do not have a scaling_governor file, skip.
[ -f "$gov" ] || continue
+ # if the CPU is offline, skip, unless no file, i.e. CPU0.
+ [ $(cat "$x/online") = "1" -o ! -f "$x/online" ] || continue
Or
+ if [ $(cat "$x/online") = "1" ] || [ ! -f "$x/online" ]; then
+ continue;
+ fi
Or something similar that actually works.
# if our temporary governor is not available, skip.
grep -q "$TEMPORARY_CPUFREQ_GOVERNOR" \
"$x/cpufreq/scaling_available_governors" || continue
savestate "${x}_governor" < "$gov"
echo "$TEMPORARY_CPUFREQ_GOVERNOR" > "$gov"
done )
}
Or just force a good return code at the end (which is what I'm doing
now, so that I can move on).
Note: I also filed this same bug report upstream.
https://bugs.freedesktop.org/show_bug.cgi?id=91914
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