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In brief, I upgraded Kubuntu 18.04 to 20.04 Beta.
STEPS TO REPRODUCE
1. Sleep/Suspend System
2. Resuming from Suspend can cause cooling fan to run at maximum.
I have a vague memory that this is a recurring issue with certain
systems and has been dealt with elsewhere. And it would appear that this
bug has come back to life in the latest kernel.
WORKAROUND:
1. Sleep/Suspend System and Resume again. (This may have to be done once or
twice. Only occasionally do I need to completely restart.)
2. Revert to older kernel. In my case I reverted to 4.18.5-041805-generic and
the bug has gone away. Tried reverting to a more recent kernel 5.2, but the bug
persisted.
System: Host: ThinkPad Kernel: 5.4.0-21-generic x86_64 bits: 64 Desktop: KDE
Plasma 5.18.3
Distro: Ubuntu 20.04 LTS (Focal Fossa)
Machine: Type: Laptop System: LENOVO product: 20HF0012US v: ThinkPad T470s
serial: <superuser/root required>
Mobo: LENOVO model: 20HF0012US v: SDK0J40697 WIN serial:
<superuser/root required> UEFI: LENOVO v: N1WET31W (1.10 )
date: 04/17/2017
Battery: ID-1: BAT0 charge: 21.6 Wh condition: 22.0/23.5 Wh (94%)
ID-2: BAT1 charge: 21.4 Wh condition: 21.7/26.3 Wh (82%)
CPU: Topology: Dual Core model: Intel Core i5-7300U bits: 64 type: MT MCP
L2 cache: 3072 KiB
Speed: 800 MHz min/max: 400/3500 MHz Core speeds (MHz): 1: 792 2:
830 3: 809 4: 822
Graphics: Device-1: Intel HD Graphics 620 driver: i915 v: kernel
Display: x11 server: X.Org 1.20.7 driver: modesetting unloaded:
fbdev,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa
20.0.2
Audio: Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel
Sound Server: ALSA v: k5.4.0-21-generic
Network: Device-1: Intel Ethernet I219-LM driver: e1000e
IF: enp0s31f6 state: down mac: c8:5b:76:e3:99:5b
Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi
IF: wlp58s0 state: up mac: f8:59:71:49:f6:2e
Drives: Local Storage: total: 476.94 GiB used: 272.06 GiB (57.0%)
ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 960 PRO 512GB size:
476.94 GiB
Partition: ID-1: / size: 33.65 GiB used: 22.44 GiB (66.7%) fs: ext4 dev:
/dev/nvme0n1p2
ID-2: swap-1 size: 15.62 GiB used: 0 KiB (0.0%) fs: swap dev:
/dev/nvme0n1p4
Sensors: System Temperatures: cpu: 36.5 C mobo: N/A
Fan Speeds (RPM): cpu: 0
Info: Processes: 236 Uptime: 1d 19h 44m Memory: 19.43 GiB used: 6.50 GiB
(33.5%) Shell: bash inxi: 3.0.38
Workaround:
This may have to with a Kernel Regression or be Kernel related? (This is
getting quickly above my pay grade.) I used Grub Customizer to boot with
kernel 4.18.5-041805-generic and network connectivity/throughput is now
functioning as it should.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Upgrading 18.04 to 20.04 Causes Fan to run at maximum after resume from suspend
...
https://bugs.launchpad.net/bugs/1871411
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