This bug report should NOT be closed without direct verification by the
submitter.
The new microcode update distribution DOES contain microcode with a
revision of 0x29 or later for the Xeon 1200v3. This means it *CAN* cause
the regression reported in this bug report.
And the microcode update packages *are* backported to older releases.
Therefore, one should *never* close bug reports related to regressions
caused by *NEWER* microcode updates -- they will eventually land
everywhere (through a bios update, through backports, etc). The only
safe ones to close are those related to *outdated* microcode.
Please keep this bug open until you get a confirmation from Chris Ng
that the latest microcode update (20151106) did NOT cause the same
regression.
** Changed in: linux-lts-vivid (Ubuntu)
Status: Invalid => Confirmed
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https://bugs.launchpad.net/bugs/1506050
Title:
intel cpu frequency is stuck at ~400mhz
Status in linux-lts-vivid package in Ubuntu:
Confirmed
Bug description:
I upgraded an install of 14.0.4.3 to the LST Enablement Stack for
Vivid (kernel 3.19) that is running on a Xeon E5-1630 V3 (a Haswell
Quad-Core) . Booting with 3.19 would result in the system being very
sluggish. 'cpupower frequency-info' would report that the CPU was
running at around 400mhz, as would 'cat
/sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq'. The CPUs
would remain around 400mhz regardless of load.
This was using the intel_pstate driver and the powersave governor.
Switching to the performance governor had no effect. Using the acpi-
cpufreq driver also had no effect, the system was still sluggish even
though the reported frequencies in /sys/devices/.
Eventually I tracked it down to the original install having had the
intel_microcode package installed at some point. Once I removed this
then the CPU frequencies scaled correctly with load. FYI the
particular version installed was intel-microcode/trusty-updates,now
2.20140624-t-1ubuntu2 amd64.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
NonfreeKernelModules: nvidia zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
Date: Wed Oct 14 12:38:05 2015
InstallationDate: Installed on 2014-08-05 (434 days ago)
InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64
(20140416.2)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)
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