The kernel speeds up and down unexpectedly

Bug #1813819 reported by Behnam Saeedi on 2019-01-29
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
Unassigned

Bug Description

It initially started while I was browsing and I noticed the page load idle logo was going a bit too fast. First I ignored it assuming I was wrong or it was not significant. So i decided to test the playback time in videos and the Linux clock and sure enough, everything is about 10% tp 20% faster. So I rebooted the OS to see if problem persists.it actually got worse Everytime I rebooted. The os starts up normally but as soon as I log in, everything gets faster and faster until keyboard, mouse become unusable. A gentle tap of the keyboard spams the screen with that letter. Then I rebooted again and as if it was some kind of overflow the os is now snail pace slow. When I tap a button it outputs a letter about 1 to 2 seconds after. The mouse moves at normal speed however.unfortunately the OS is unusable and I'm typing this bug report using a different device. Please let me know if there is a way for me to get logs remotely cause as it is OS is useless. I'll try too keep rebooting to see if there is a "usable" speed that I can get logs and upload. Hopefully by the time this bug is processed I'll get the report. In the mean time please feel free to ask me anything that would help you pin point the issue.
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ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: behnamsaeedi 2119 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=02231d39-2008-4f45-a939-bc5edcae0177
InstallationDate: Installed on 2017-06-05 (603 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
MachineType: LENOVO 20175
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID=7d034780-07bb-489d-b701-fd652ed822fe ro quiet splash clocksource=jiffies vt.handoff=7
ProcVersionSignature: Ubuntu 4.15.0-43.46~16.04.1-generic 4.15.18
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-43-generic N/A
 linux-backports-modules-4.15.0-43-generic N/A
 linux-firmware 1.157.21
Tags: xenial
Uname: Linux 4.15.0-43-generic x86_64
UpgradeStatus: Upgraded to xenial on 2019-01-18 (11 days ago)
UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 01/21/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 66CN54WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Yoga 13
dmi.modalias: dmi:bvnLENOVO:bvr66CN54WW:bd01/21/2013:svnLENOVO:pn20175:pvrLenovoIdeaPadYoga13:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadYoga13:
dmi.product.family: IDEAPAD
dmi.product.name: 20175
dmi.product.version: Lenovo IdeaPad Yoga 13
dmi.sys.vendor: LENOVO

Colin Watson (cjwatson) on 2019-01-29
affects: launchpad → linux (Ubuntu)

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1813819

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete

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tags: added: apport-collected xenial
description: updated

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Changed in linux (Ubuntu):
status: Incomplete → Confirmed
Behnam Saeedi (behnam-saeidi) wrote :

New update:
- When using arrow keys, the keyboard random spews out num key values of the arrows as if the button is stuck even when number lock is off. All I have to to replicate this bug is to hold arrow key down
- Putting the laptop into sleep and waking it up, seem to reduce the clock speed effect until it reboots again. (it made the computer usable enough for me to take the bug report and start pushing my files to repos)

Behnam Saeedi (behnam-saeidi) wrote :

New update:
- network connection is affected too, wifi keeps dropping out

Kai-Heng Feng (kaihengfeng) wrote :

The only thing I observed in the dmesg is that the Realtek card reader keeps dropped off the USB bus.

Please update the system, the new kernel has a fix for the card reader that may help your case.

Behnam Saeedi (behnam-saeidi) wrote :

Given the amazing product support, I decided to completely give up and re install the entire OS. That was an astonishing support for an LTS product ... For people who have a similar issue here are the things that does not work so don't waste time one:
- rebooting
- rapidly updating the system time
- use a different time package
- adjust the CPU frequency
- switch different CPU modes
- removing/reinstalling/purging:
 - chrome
 - xinput
 - xorg
 - xserver
 - I/O drivers
 - display drivers
 - sd drivers
 - network drivers
 - optical drivers
 - power management tools
 - browsers
- recovery mode
- rolling back

My recommendation: Install a Linux distro that respects LTS terms and does not push broken updates.

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