ivybridge system gets completely unusable after upgrade to vivid thanks to defaulting to immature intel_pstate driver
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
High
|
Unassigned | ||
Vivid |
Invalid
|
High
|
Unassigned |
Bug Description
I finally got around to upgrade my work laptop (first gen dell XPS sputnik system (ivy bridge)) yesterday, to find myself with a completely unusable and sluggish desktop, constantly spinning CPU fans and a hot enough laptop case that you can burn your fingers after the first reboot after install ... the device didn't stay on for more than 10-15min in a row before the BIOS temperature monitor initiated emergency shutdowns.
i also noticed a constant load average above 30.00 in htop
after a few hours of researching i found that we apparently switched to the intel_pstate driver by default in vivid ...
running a very simple script like:
while true; do
clear
cat /proc/cpuinfo |grep MHz
sleep 1
done
...revealed that the cores unconditionally switch to something like 133MHz even though there is currently a lot going on in the system (firefox trying to recover 150 tabs after boot, evolution syncing with an IMAP server etc). it looks to me like the intel_pstate driver (at least on ivybridge hardware) is far from being ready for end users and if i wouldn't have known how to do a detailed research on these issues i would most likely have switched to another distro or to a different known working ubuntu release. could we turn this default back to the ondemand cpufreq governor in an SRU until the driver has matured enough, so we do not lose our ivybridge users and do not generate bad press ?
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.19.0-18-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: Unity
Date: Sun May 31 11:53:35 2015
DistributionCha
# This is a distribution channel descriptor
# For more information see http://
canonical-
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-11-05 (572 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
MachineType: Dell Inc. XPS L322X
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.143.1
SourcePackage: linux
SystemImageInfo:
current build number: 0
device name:
channel: daily
last update: Unknown
UpgradeStatus: Upgraded to vivid on 2015-05-30 (0 days ago)
dmi.bios.date: 08/28/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0PJHXN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.
dmi.modalias: dmi:bvnDellInc.
dmi.product.name: XPS L322X
dmi.sys.vendor: Dell Inc.
Changed in linux (Ubuntu Vivid): | |
importance: | Undecided → High |
status: | New → Confirmed |
tags: | added: kernel-key |
tags: |
added: kernel-da-key removed: kernel-key |
just for completeness (in case someone looks for a wrokaround), adding intel_pstate= disable to GRUB_CMDLINE_ LINUX_DEFAULT in /etc/default/grub and running sudo update-grub got me the ondemand driver back and got the system back to behave as stable as in 14.10.