CPU frequency management fails to re-engage on resume from suspend
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
High
|
Unassigned | ||
pm-utils (Ubuntu) |
Invalid
|
High
|
Unassigned |
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-
ProcVersionSign
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
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=
RelatedPackageV
linux-
linux-
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.
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.
dmi.modalias: dmi:bvnInsyde:
dmi.product.name: HP ENVY 15 x360 PC
dmi.product.
dmi.sys.vendor: Hewlett-Packard
Changed in pm-utils (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
Changed in pm-utils (Ubuntu): | |
importance: | Undecided → High |
This change was made by a bot.