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
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