Control: tag -1 moreinfo On Sun, 18 Sep 2016 19:08:32 +0200 Alessio <alga...@gmail.com> wrote: > 2016-09-18 15:44 GMT+02:00 Ben Hutchings <b...@decadent.org.uk>: > > Control: tag -1 moreinfo > > > > On Sun, 2016-09-18 at 14:46 +0200, Alessio Gaeta wrote: > >> Package: src:linux > >> Version: 4.7.2-1+s1 > >> Severity: important > >> > >> Hello, > >> > >> I'm facing a power issue with the Linux 4.7 kernel. > >> > >> Every time the system goes idle (the configured delay passes and the > >> display > >> goes black), the frequency of all cores get maxed, even if all cores are > >> idle. > >> > >> Evident symptoms are the fan spinning loudly and the errors logged in > >> journal > >> stating the thermal threshold being surpassed and the CPU throttled. > >> > >> In detail, the frequency of all cores raises from ~800 MHz to 2.6 GHz for > >> all 8 > >> cores of my i7. I can reproduce the behavior 100% of times, by connecting > >> via > >> ssh to the affected system and launching powertop. > >> > >> The issue does not exists in Linux 4.6 (to wich I will stick for now), so I > >> guess the problem resides in kernel, not in other packages. > >> > >> You have all system information here below (gathered by repotbug). Ask any > >> further info if needed. Thank you! > > [...] > > > > Please test with bbswitch and acpi_call removed. > > Hello, > > tested again: > > 1. systemctl stop bumblebeed.service > 2. modprobe -r bbswitch > 3. modprobe -r acpi_call > 4. systemctl stop vboxweb.service > 5. modprobe -r vboxpci vboxnetflt vboxnetadp vboxdrv > > (removed all out-of-tree modules, just to be sure). > > Same result: on display idle the CPU frequency got maxed on all cores. > > Tell me if you need more info.
OK, so something (other than those modules) is keeping the CPUs busy.
Please install linux-perf and use perf (as root) to show what it's busy
with:
perf record -a sleep 10 # creates 'perf.data' in current dir
perf report > perf_report.txt # will show some warnings; don't worry about
them
Ben.
--
Ben Hutchings
No political challenge can be met by shopping. - George Monbiot
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