** Attachment added: "kern.log from session in which cpu freq control failed on
resume from suspend"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1484587/+attachment/4444227/+files/kern_log_cpu_resume_bug.txt
** Also affects: pm-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1484587
Title:
CPU frequency management fails to re-engage on resume from suspend
Status in linux package in Ubuntu:
Confirmed
Status in pm-utils package in Ubuntu:
New
Bug description:
Behavior:
CPU frequency management fails to re-engage on resume from suspend. On
resume, the CPUs are stuck around a single frequency (usually a low
idle frequency).
I use indicator-cpufreq for manual governor control. On resume,
indicator-cpufreq indicates the low frequency state in its live cpu
performance display in the icon. However, in its governor menu, it
still shows as in use whichever governor was selected before suspend,
even though that governor is not actually or properly controlling the
CPU state.
Upon manually switching to the unused governor in indicator-cpufreq,
this behavior resolves, and the newly-chosen governor begins
performing its duties. I can then immediately switch back to the
desired (pre-suspend) governor with no issues.
PM logs appear to show a successful resume of cpu frequency
management, even though the modules did not actually gain effective
control of the processor frequencies.
Expected behavior:
On resume, the CPU frequencies should continue being managed as they
were before suspend without the need for manual user input. Also, in
the event that they do not, an error/warning should appear -- if not
to the user, then in the pm suspend/resume logs.
Other information that may or may not be relevant:
On this system, the "powersave" governor is always automatically
chosen at startup, although not until a minute or so after session
login. The choice of an alternate governor "performance" from
indicator-cpufreq is not persistent across reboots. Further, if I
manually toggle the governors at the beginning of my first session
after boot, and I settle on "performance", some automated script will
force it back to "powersave" at the usual time about a minute after
login. To use the "performance" governor, I must select it after
waiting an interval following login, and I must always switch to
powersave and back to performance after each resume from suspend.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-25-generic 3.19.0-25.26
ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: adam 3887 F.... pulseaudio
/dev/snd/controlC1: adam 3887 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Aug 13 11:41:27 2015
InstallationDate: Installed on 2014-08-10 (368 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
MachineType: Hewlett-Packard HP ENVY 15 x360 PC
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-25-generic.efi.signed
root=UUID=5ad8035a-f2a4-4334-84d8-e2a8a7396bf8 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.19.0-25-generic N/A
linux-backports-modules-3.19.0-25-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/19/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.26
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 22D6
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 89.23
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnInsyde:bvrF.26:bd01/19/2015:svnHewlett-Packard:pnHPENVY15x360PC:pvr0974100022405F00000420180:rvnHewlett-Packard:rn22D6:rvr89.23:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP ENVY 15 x360 PC
dmi.product.version: 0974100022405F00000420180
dmi.sys.vendor: Hewlett-Packard
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