[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Expired
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
For your Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz processor, what is the
normal minimum pstate? I ask because I have only seen on battery power
resume from suspend issues that are related to Clock Modulation becoming
enabled. i.e. I am wondering if 800MHz is a normal minimum frequency or
below the normal minimum.
One way, would be to do:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq
160
160
160
160
160
160
160
160
and you can see that on my computer ( Intel(R) Core(TM) i7-2600K CPU @
3.40GHz ), the minimum pstate is 16.
I'm not sure yet if our issues are related, but on my computer, I also
am seeing odd stuff on resume from suspend (I didn't used to), but my
CPU frequencies are not stuck low, but rather never go below pstate 24,
even though the driver is asking for lower. I also get the same lack of
restoring the proper governor on all the CPUs except CPU 0 (and note
that for an S3 suspend CPU 0 is the one that never goes off line).
Example (no load):
pstate being asked for:
# rdmsr --bitfield 15:8 -d -a 0x199
16
16
16
16
16
16
16
16
pstate that I am getting:
# rdmsr --bitfield 15:8 -d -a 0x198
24
24
24
24
24
24
24
24
CPU freqs:
# grep MHz /proc/cpuinfo
cpu MHz : 2400.054
cpu MHz : 2399.921
cpu MHz : 2399.921
cpu MHz : 2399.921
cpu MHz : 2399.789
cpu MHz : 2399.789
cpu MHz : 2399.921
cpu MHz : 2399.921
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions
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[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
> did you confirm that the quoted commit does indeed fix your issue?
No, I am not building Linux from source currently, and have not tried
e.g. applying that patch/commit to the Ubuntu package.
I am now back using the Ubuntu kernel, since the workaround is trivial
in case it is required - once you know what the issue is about.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions
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[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
Christopher, please change the status back to Confirmed/Triaged,
according to my feedback.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions
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[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
Daniel Hahler, could you please test the patch to confirm it actually
fixes your issue? Instructions may be found at
https://wiki.ubuntu.com/Kernel/KernelBisection#Testing_a_newly_released_patch_from_upstream
.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions
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[Kernel-packages] [Bug 1497520] Re: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate
Daniel Hahler, did you confirm that the quoted commit does indeed fix
your issue?
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497520
Title:
Slow performance after resuming from/on battery (CPUs do not scale
above 800MHz) with intel_pstate
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have noticed slow performance after resuming from STR on battery.
I can not trigger this always, but it seems to be related to
suspending and resuming while on battery.
The CPU scaling governors look like this then:
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
performance
performance
performance
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
intel_pstate
intel_pstate
intel_pstate
intel_pstate
% cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
320
320
320
320
When watching the current CPU frequencies, it can be seen that they
don't go above 80 ('watch grep \"cpu MHz\" /proc/cpuinfo').
I cannot see why they are limited to 80.
It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but
/sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100.
Just writing the same setting for cpu0 again fixes it, and all CPUs
will be scaled above 800MHz again:
% echo powersave | sudo tee
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 10:39:02 2015
HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd
InstallationDate: Installed on 2012-05-28 (1208 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: LENOVO 42992PG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic
root=/dev/mapper/vg0-rootlv ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.19.0-28-generic N/A
linux-backports-modules-3.19.0-28-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago)
dmi.bios.date: 05/14/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET70WW (1.40 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42992PG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42992PG
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions
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Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
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