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Message #94743
[Bug 1264346] Re: [Dell Latitude E6520] After suspend, machine very slow with ondemand governor
I'm still having this problem after updating to 14.10.
This issue exclusively arises if I suspend my laptop when connected to
the power cord, then unplug it during suspend and wake it up on battery.
It does not happen every time, maybe once in seven times.
The scaling_governor keeps all cores at "powersave". As soon as I
replace that with "performance" through cpufreq-set the issue is solved.
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https://bugs.launchpad.net/bugs/1264346
Title:
[Dell Latitude E6520] After suspend, machine very slow with ondemand
governor
Status in linux package in Ubuntu:
Fix Released
Bug description:
After several suspend/resume cycles and several days of uptime, using the ondemand governor the system is very slow to answer some inputs. The text output pauses for several seconds while I am typing this text. Trying to scroll a firefox window takes several seconds. Switching tabs in firefox takes several seconds:
cat /sys/devices/system/cpu/c*/cpufreq/scaling_governor
ondemand
ondemand
ondemand
ondemand
WORKAROUND: Setting the governor to "performance" fixes this problem.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-15-generic 3.11.0-15.23
ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: bonnaudl 2373 F.... pulseaudio
Date: Thu Dec 26 18:17:23 2013
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=cf81afe7-8427-45fa-9149-c11d060a5a26
InstallationDate: Installed on 2013-04-27 (243 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Dell Inc. Latitude E6520
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=749a9901-bdd3-4b5f-b80e-69414667e058 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.11.0-15-generic N/A
linux-backports-modules-3.11.0-15-generic N/A
linux-firmware 1.116
SourcePackage: linux
UpgradeStatus: Upgraded to saucy on 2013-10-01 (86 days ago)
dmi.bios.date: 02/28/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0NVF5K
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd02/28/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0NVF5K:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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References