Gonçalo Marrafa, did this problem not occur in a release prior to Saucy?
** Tags added: latest-bios-a05 needs-upstream-testing regression-
potential resume suspend
** Summary changed:
- CPU stuck on minimum frequency after resume from suspend and unplugged
+ [Dell Latitude E6540] CPU stuck on
OK, so i tested the 3.13 kernel (3.13.0-031300rc3-generic) and it does
_seem_ to make a difference. The problem is that the ondemand cpu
governor is not available, only powersave and performance so i have no
real way, other than what the system feels to me, to test this issue.
** Changed in:
OK, so for a more scientific test. I used sysbench to test CPU
performance. I tested with the stock 3.11.0-15-generic kernel and the
test 3.13.0-031300rc3-generic kernel, both before and resume a
suspend/resume cycle.
The command i used to perform the tests:
sysbench --num-threads=8 --test=cpu
Did this issue occur in a previous version of Ubuntu, or is this a new
issue?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.12 kernel[0].
If this bug is fixed in the mainline kernel, please add
I can't say if the issue occurs in other versions since the laptop is
new and i just installed 13.10 on it. Will test the kernel and update
with the results.
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apport information
** Tags added: apport-collected saucy
** Description changed:
This happens on a Dell Latitude E6540 (4th gen core i7 CPU).
Steps to reproduce:
1) normally boot the computer and make sure everything works as expected (i
use the ondemand governor)
2) suspend
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