i915 kernel module loads 1 cpu core 100%

[Christoph Gohle]

When no display is connected to the HDMI port of the integrated graphics card (i915), one core will go to 100% load until a display is plugged in again.

For a headless system the workaround is to blacklist the i915 module in grub.

There are several patches around:

https://bugs.freedesktop.org/attachment.cgi?id=145826
https://github.com/torvalds/linux/commit/67322bec979caa33e0ac4505306bf70af46208e4

maybe a backport of one of these patches to the current kernel would be an option?

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-29-generic 5.3.0-29.31
ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
Uname: Linux 5.3.0-29-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.3.0-29-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 'amixer'
Date: Thu Jan 30 00:55:42 2020
HibernationDevice: RESUME=UUID=c09a58c4-725a-4fb9-8cc1-7e0ac26f1350
InstallationDate: Installed on 2016-11-05 (1180 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
 Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: ASUS All Series
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-29-generic root=UUID=72f24acb-8f4a-42c0-a421-b2f9f3298a6e ro module_blacklist=i915
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-29-generic N/A
 linux-backports-modules-5.3.0-29-generic N/A
 linux-firmware 1.183.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to eoan on 2020-01-21 (8 days ago)
dmi.bios.date: 02/20/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0510
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: N3150I-C
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0510:bd02/20/2017:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnN3150I-C:rvrRevX.0x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.