Since my initial report I updated the BIOS of this laptop:
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A19
11/14/2013
and today (after 8 days of uptime and perhaps 20 suspend/resume cycles)
the bug reappeared:
# /usr/lib/checkbox/bin/frequency_governors_test
2014-01-23 12:09:52 INFO System Capabilites:
2014-01-23 12:09:52 INFO -------------------------------------------------
2014-01-23 12:09:52 INFO System has 4 cpus
2014-01-23 12:09:52 INFO Supported CPU Frequencies:
2014-01-23 12:09:52 INFO 2801 MHz
2014-01-23 12:09:52 INFO 2800 MHz
2014-01-23 12:09:52 INFO 2600 MHz
2014-01-23 12:09:52 INFO 2400 MHz
2014-01-23 12:09:52 INFO 2200 MHz
2014-01-23 12:09:52 INFO 2000 MHz
2014-01-23 12:09:52 INFO 1800 MHz
2014-01-23 12:09:52 INFO 1600 MHz
2014-01-23 12:09:52 INFO 1400 MHz
2014-01-23 12:09:52 INFO 1200 MHz
2014-01-23 12:09:52 INFO 1000 MHz
2014-01-23 12:09:52 INFO 800 MHz
2014-01-23 12:09:52 INFO Supported Governors:
2014-01-23 12:09:52 INFO conservative
2014-01-23 12:09:52 INFO ondemand
2014-01-23 12:09:52 INFO userspace
2014-01-23 12:09:52 INFO powersave
2014-01-23 12:09:52 INFO performance
2014-01-23 12:09:52 INFO Current governors:
2014-01-23 12:09:52 INFO cpu0: ondemand
2014-01-23 12:09:52 INFO cpu1: ondemand
2014-01-23 12:09:52 INFO cpu2: ondemand
2014-01-23 12:09:52 INFO cpu3: ondemand
2014-01-23 12:09:52 INFO Beginning Frequency Governors Testing
2014-01-23 12:09:52 INFO Userspace Governor Test:
2014-01-23 12:09:52 INFO -------------------------------------------------
2014-01-23 12:09:52 INFO Setting governor to userspace
2014-01-23 12:10:22 INFO Setting CPU frequency to 800 MHz
2014-01-23 12:10:22 INFO Running CPU load test...
2014-01-23 12:10:22 INFO pid 4285's current affinity list: 0-3
2014-01-23 12:10:22 INFO pid 4285's new affinity list: 0
2014-01-23 12:10:23 INFO Minimum frequency load test time: 0.25
2014-01-23 12:10:23 INFO Setting CPU frequency to 2801 MHz
2014-01-23 12:10:23 INFO Running CPU load test...
2014-01-23 12:10:23 INFO pid 4285's current affinity list: 0
2014-01-23 12:10:23 INFO pid 4285's new affinity list: 0
2014-01-23 12:10:23 INFO Maximum frequency load test time: 0.05
2014-01-23 12:10:23 INFO Found ida flag, increasing expected speedup by 8.0%
2014-01-23 12:10:23 INFO CPU Frequency Speed Up: 3.81
2014-01-23 12:10:23 INFO Measured Speed Up: 5.00
2014-01-23 12:10:23 INFO Percentage Difference 31.4%
2014-01-23 12:10:23 ERROR Measured speedup vs expected speedup is 31.4% and
is not within 10.0% margin.
2014-01-23 12:10:23 INFO On Demand Governor Test:
2014-01-23 12:10:23 INFO -------------------------------------------------
2014-01-23 12:10:23 INFO Setting governor to ondemand
2014-01-23 12:10:23 INFO Waiting 5 seconds...
2014-01-23 12:10:28 INFO Done.
2014-01-23 12:10:28 INFO Running CPU load test...
2014-01-23 12:10:28 INFO pid 4285's current affinity list: 0
2014-01-23 12:10:28 INFO pid 4285's new affinity list: 0
2014-01-23 12:10:28 INFO On Demand load test time: 0.24
2014-01-23 12:10:28 INFO Percentage Difference vs. maximum frequency: 380.0%
2014-01-23 12:10:28 ERROR On demand performance vs maximum of 380.0% is not
within 10.0% margin
2014-01-23 12:10:28 INFO Waiting 5 seconds...
2014-01-23 12:10:33 INFO Done.
2014-01-23 12:10:33 INFO Performance Governor Test:
2014-01-23 12:10:33 INFO -------------------------------------------------
2014-01-23 12:10:33 INFO Setting governor to performance
2014-01-23 12:10:33 INFO Running CPU load test...
2014-01-23 12:10:33 INFO pid 4285's current affinity list: 0
2014-01-23 12:10:33 INFO pid 4285's new affinity list: 0
2014-01-23 12:10:33 INFO Performance load test time: 0.05
2014-01-23 12:10:33 INFO Percentage Difference vs. maximum frequency: 0.0%
2014-01-23 12:10:33 INFO Conservative Governor Test:
2014-01-23 12:10:33 INFO -------------------------------------------------
2014-01-23 12:10:33 INFO Setting governor to conservative
2014-01-23 12:10:33 INFO Waiting 10 seconds...
2014-01-23 12:10:43 INFO Done.
2014-01-23 12:10:43 INFO Running CPU load test...
2014-01-23 12:10:43 INFO pid 4285's current affinity list: 0
2014-01-23 12:10:43 INFO pid 4285's new affinity list: 0
2014-01-23 12:10:44 INFO Conservative load test time: 0.24
2014-01-23 12:10:44 INFO Percentage Difference vs. minimum frequency: 4.0%
2014-01-23 12:10:44 INFO Restoring original governor to ondemand
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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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:
Confirmed
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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