Notebook overheating after upgrading to K5.4.0-80

[karlchen]

Hi, folks.

I wonder whether it is only me on this specific notebook, or whether others experience the same issue:
This Dell notebook has been running on LM 19.3 for the past 2 years daily many hours per day. Even on the hottest summer days last year, it never exhibited any signs of overheating, no matter how much load I put on it.
This is true for all kernels up to and including 5.4.0-77.

Yet, since K5.4.0-77 has been upgraded to K5.4.0-80, the same notebook seems to have a tendency of overheating. The corresponding log entries can be retrieved in /var/log/syslog* files or by querying the system journal.

Today I booted the previous kernel K5.4.0-77. So far no signs of overheating. As I could not find any sign of dust blocking air flow inside the machine, I wonder whether this time the most recent kernel upgrade K5.4.0-80 should be the culprit.

Anyone seeing similar temperature issues after upgrading to K5.4.0-80?

Regards,
Karl
--
P.S.:
Very likely this evening, I will create another separate thread, reporting about my ancient Packard Bell, which has worked reliably and without ever locking up completely. This has been true up to and including K4.15.0-77. [] Booted with K4.15.0-80 twice, the same laptop has locked up completely twice within 2 days. This simply smells as if Ubuntu have implemented some bad regression in their most recent kernel updates.
--

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System:    Host: computer Kernel: 5.4.0-80-generic x86_64 bits: 64 compiler: gcc v: 7.5.0 Desktop: Cinnamon 4.4.8
           tk: GTK 3.22.30 wm: muffin 4.4.4 vt: 7 dm: LightDM 1.26.0 Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic
Machine:   Type: Laptop System: Dell product: Latitude 5400 v: N/A serial: [filter] Chassis: type: 10 serial: [filter]
           Mobo: Dell model: 0PD9KD v: A00 serial: [filter] UEFI: Dell v: 1.3.11 date: 06/11/2019
Battery:   ID-1: BAT0 charge: 63.7 Wh (100.0%) condition: 63.7/68.0 Wh (93.7%) volts: 8.7 min: 7.6
           model: Samsung SDI DELL RF7WM97 type: Li-ion serial: [filter] status: Full
CPU:       Info: Quad Core model: Intel Core i5-8265U bits: 64 type: MT MCP arch: Kaby Lake note: check rev: C cache:
           L2: 6 MiB
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 28800
           Speed: 800 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 802 8: 800
Graphics:  Device-1: Intel vendor: Dell driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:3ea0 class-ID: 0300
           Device-2: Microdia type: USB driver: uvcvideo bus-ID: 1-6:3 chip-ID: 0c45:6a09 class-ID: 0e02
           Display: x11 server: X.Org 1.19.6 driver: loaded: modesetting unloaded: fbdev,vesa resolution: 1600x900 s-dpi: 96
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.0.8 compat-v: 3.0 direct render: Yes
Audio:     Device-1: Intel vendor: Dell driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:9dc8 class-ID: 0403
           Sound Server-1: ALSA v: k5.4.0-80-generic running: yes
           Sound Server-2: PulseAudio v: 11.1 running: yes
Network:   Device-1: Intel driver: iwlwifi v: kernel port: 3000 bus-ID: 00:14.3 chip-ID: 8086:9df0 class-ID: 0280
           IF: wlo1 state: up mac: [filter]
           Device-2: Intel Ethernet I219-V vendor: Dell driver: e1000e v: 3.2.6-k port: efa0 bus-ID: 00:1f.6
           chip-ID: 8086:15be class-ID: 0200
           IF: eno2 state: down mac: [filter]
Bluetooth: Device-1: Intel type: USB driver: btusb v: 0.8 bus-ID: 1-10:4 chip-ID: 8087:0aaa class-ID: e001
           Report: hciconfig ID: hci0 rfk-id: 0 state: up address: [filter] bt-v: 3.0 lmp-v: 5.0 sub-v: 100 hci-v: 5.0
           rev: 100
Drives:    Local Storage: total: 238.33 GiB used: 16.07 GiB (6.7%)
           ID-1: /dev/mmcblk0 model: SN128 size: 119.08 GiB rotation: SSD serial: [filter] scheme: GPT
           ID-2: /dev/nvme0n1 vendor: Toshiba model: KBG40ZNS128G NVMe 128GB size: 119.24 GiB speed: 31.6 Gb/s lanes: 4
           rotation: SSD serial: [filter] rev: 10410102 scheme: GPT
Partition: ID-1: / size: 58.81 GiB used: 16.07 GiB (27.3%) fs: ext4 dev: /dev/mmcblk0p2
           ID-2: /boot/efi size: 511 MiB used: 6.6 MiB (1.3%) fs: vfat dev: /dev/mmcblk0p1
Swap:      ID-1: swap-1 type: partition size: 8 GiB used: 0 KiB (0.0%) priority: -2 dev: /dev/mmcblk0p3
Sensors:   System Temperatures: cpu: 43.0 C mobo: N/A
           Fan Speeds (RPM): cpu: 0
Info:      Processes: 248 Uptime: 5m wakeups: 745 Memory: 7.62 GiB used: 1.22 GiB (16.0%) Init: systemd v: 237 runlevel: 5
           Compilers: gcc: 7.5.0 alt: 7 Packages: 2318 apt: 2314 flatpak: 4 Shell: Bash v: 4.4.20 running-in: gnome-terminal
           inxi: 3.3.04

This inxi report was created 5 minutes after starting up. This is why the temperature is at low 43.0 C still. This machine does not like temperatures above 60.0 C.

[SMG]

Today I booted the previous kernel K5.4.0-77. So far no signs of overheating. As I could not find any sign of dust blocking air flow inside the machine, I wonder whether this time the most recent kernel upgrade K5.4.0-80 should be the culprit.

I have not noticed a difference with my laptop, but mine is older and running LM20.2 so either of those factors might be a difference.

Here is the 5.4.0-80 changelog. Nothing jumped out at me as something which might cause a temperature change in your laptop, but I'm not as familiar with your hardware as you are.

Looking at the in-progress changelog for the next kernel, it seems like there are a lot of changes coming with it. Maybe something there will help.

Generally speaking, it seems 7th or 8th gen Intel and newer have better performance, including temperature control, with the newer kernels (5.8 and higher). Had you been running LM20 I would have advised to upgrade the kernel.

[karlchen]

Hi, SMG.

The change list for 5.4.0-78 is pretty long, the change lists for 5.4.0-79 and 5.4.0-80 are brief. All in all a long change list from 5.4.0-77 to 5.4.0-80. Plus, if it is a regression / bug, it may not be listed as an intended change in the changelog at all. Or we will not be able to identify which listed change may have this unwanted side effect on specific hardware.
The suspicious circumstance is that the issue has not occurred here on my Dell notebook up to K5.4.0-77. Running on K5.4.0-77 today no signs of overheating the whole working day through.
In addition note the P.S. in my previous post about the other machine, which worked fine up to K4.15.0-147, but was hit by 2 hard freezes at lowest level on 2 days in a row, once it had been upgraded to K4.15.0-151.
This somehow simply smells like a regression. I will pay a visit to bugs.launchpad.net this evening or tomorrow, whenever I will find the time.

Regards,
Karl

[senjoz]

Info: Processes: 248 Uptime: 5m wakeups: 745 Memory: 7.62 GiB used: 1.22 GiB (16.0%) Init: systemd v: 237 runlevel: 5
Compilers: gcc: 7.5.0 alt: 7 Packages: 2318 apt: 2314 flatpak: 4 Shell: Bash v: 4.4.20 running-in: gnome-terminal
inxi: 3.3.04

Those 745 wakeups in 5 minutes could be problematic.

Is any background process activ? What shows htop?

Regards, Jože

[karlchen]

Hello, Jože.

inxi has reported such irritating wakeup counts for the past 2 years on this specific machine. The machine is 2 years old.
In spite of this irritating wakeup count, the machine has run LM 19.3 without signs of overheating up to and including kernel 5.4.0-77.
The day that kernel K5.4.0-80 was installed, was the day, when the machine exhibited signs of overheating for the first time.
The day that the machine was booted with K5.4.0-77 again was the day that the signs of overheating stopped occurring again.

Personally, I think that the wakeup counts are wrong, definitely. But at this point in time I fail to see that they are related to the overheating problem, which is only present, when kernel K5.4.0-80 is loaded.

Best regards,
Karl

[senjoz]

When booting mentioned kernels on my notebook with Core i5-7200U and LM 20.2 Cinnamon I do not notice significant differences in processor temperature and processor power consumption.

Kernel 5.4.0-77 (results from sensors and sudo powerstat 5 -RD in idle state)

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Package id 0:  +40.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +40.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +39.0°C  (high = +100.0°C, crit = +100.0°C)

  Time    User  Nice   Sys  Idle    IO  Run Ctxt/s  IRQ/s Fork Exec Exit  Watts  uncore  pkg-0   core   dram   psys
09:04:41   0.3   0.0   0.2  99.5   0.1    1    199     92    0    0    0   0.56    0.01   0.56   0.06   0.46   0.02
09:04:46   0.3   0.0   0.2  99.5   0.0    1    168     91    0    0    0   0.53    0.01   0.53   0.05   0.45   0.02
09:04:51   0.1   0.0   0.1  99.8   0.0    1     98     46    0    0    0   0.48    0.01   0.48   0.03   0.43   0.01
09:04:56   0.4   0.0   0.2  99.3   0.1    1    183    101    0    0    0   0.56    0.01   0.56   0.06   0.46   0.02
09:05:01   0.3   0.0   0.1  99.5   0.1    1    174     99    0    0    0   0.56    0.02   0.56   0.05   0.45   0.02
09:05:06   0.2   0.0   0.1  99.8   0.0    1     83     43    0    0    0   0.48    0.01   0.48   0.03   0.44   0.01
09:05:11   0.3   0.0   0.2  99.5   0.0    1    170     87    0    0    0   0.55    0.01   0.55   0.06   0.48   0.02
09:05:16   0.3   0.0   0.1  99.7   0.0    1    160     77    0    0    0   0.52    0.02   0.52   0.05   0.45   0.02
09:05:21   0.2   0.0   0.1  99.7   0.0    1     97     49    0    0    0   0.48    0.01   0.48   0.03   0.44   0.01
09:05:26   0.3   0.0   0.2  99.6   0.0    1    162     90    0    0    0   0.53    0.01   0.53   0.05   0.46   0.02
09:05:31   0.2   0.0   0.2  99.6   0.0    1    167     84    0    0    0   0.53    0.02   0.53   0.05   0.47   0.02
09:05:36   0.2   0.0   0.1  99.8   0.0    1     85     46    0    0    0   0.48    0.01   0.48   0.03   0.43   0.01
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------  ------ ------ ------ ------ ------
 Average   0.2   0.0   0.1  99.6   0.0  1.0  145.6   75.5  0.0  0.0  0.0   0.52    0.01   0.52   0.04   0.45   0.02
 GeoMean   0.2   0.0   0.1  99.6   0.0  1.0  139.2   71.9  0.0  0.0  0.0   0.52    0.01   0.52   0.04   0.45   0.02
  StdDev   0.1   0.0   0.1   0.1   0.0  0.0   40.1   21.6  0.0  0.0  0.0   0.03    0.01   0.03   0.01   0.02   0.00
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------  ------ ------ ------ ------ ------
 Minimum   0.1   0.0   0.1  99.3   0.0  1.0   83.4   43.2  0.0  0.0  0.0   0.48    0.01   0.48   0.03   0.43   0.01
 Maximum   0.4   0.0   0.2  99.8   0.1  1.0  198.6  101.2  0.0  0.0  0.0   0.56    0.02   0.56   0.06   0.48   0.02

Kernel 5.4.0-80 (results from sensors and sudo powerstat 5 -RD in idle state)

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Package id 0:  +41.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +40.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +40.0°C  (high = +100.0°C, crit = +100.0°C)

  Time    User  Nice   Sys  Idle    IO  Run Ctxt/s  IRQ/s Fork Exec Exit  Watts  uncore  pkg-0   core   dram   psys
09:33:38   0.3   0.0   0.1  99.7   0.0    1    181     98    0    0    0   0.55    0.02   0.55   0.06   0.46   0.02
09:33:43   0.3   0.0   0.2  99.4   0.1    1    184     92    0    0    0   0.57    0.02   0.57   0.06   0.48   0.02
09:33:48   0.1   0.0   0.1  99.8   0.1    1     96     50    0    0    0   0.50    0.01   0.50   0.03   0.43   0.02
09:33:53   0.2   0.0   0.2  99.5   0.1    1    174     93    0    0    0   0.56    0.02   0.56   0.05   0.46   0.02
09:33:58   0.3   0.0   0.1  99.6   0.0    1    183     91    0    0    0   0.56    0.02   0.56   0.06   0.47   0.02
09:34:03   0.2   0.0   0.1  99.8   0.0    1    107     61    0    0    0   0.50    0.01   0.50   0.04   0.45   0.02
09:34:08   0.3   0.0   0.1  99.6   0.0    1    162     91    0    0    0   0.56    0.02   0.56   0.05   0.46   0.02
09:34:13   0.3   0.0   0.2  99.5   0.0    1    186     90    0    0    0   0.55    0.02   0.55   0.06   0.46   0.02
09:34:18   0.1   0.0   0.1  99.8   0.0    1     87     46    0    0    0   0.48    0.01   0.48   0.03   0.44   0.01
09:34:23   0.2   0.0   0.2  99.6   0.0    1    169     97    0    0    0   0.54    0.02   0.54   0.05   0.46   0.02
09:34:28   0.3   0.0   0.3  99.4   0.0    1    170     93    0    0    0   0.54    0.02   0.54   0.05   0.49   0.02
09:34:33   0.3   0.0   0.1  99.5   0.0    1    119     60    0    0    0   0.51    0.01   0.51   0.05   0.43   0.02
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------  ------ ------ ------ ------ ------
 Average   0.2   0.0   0.1  99.6   0.0  1.0  151.5   80.1  0.0  0.0  0.0   0.53    0.02   0.53   0.05   0.46   0.02
 GeoMean   0.2   0.0   0.1  99.6   0.0  1.0  146.5   77.5  0.0  0.0  0.0   0.53    0.02   0.53   0.05   0.46   0.02
  StdDev   0.1   0.0   0.1   0.1   0.0  0.0   36.1   18.7  0.0  0.0  0.0   0.03    0.01   0.03   0.01   0.02   0.00
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------  ------ ------ ------ ------ ------
 Minimum   0.1   0.0   0.1  99.4   0.0  1.0   87.4   46.4  0.0  0.0  0.0   0.48    0.01   0.48   0.03   0.43   0.01
 Maximum   0.3   0.0   0.3  99.8   0.1  1.0  186.0   97.6  0.0  0.0  0.0   0.57    0.02   0.57   0.06   0.49   0.02

Also I do not notice significant differences when the processor is stressed for a longer time with 15 W TDP.

The corresponding log entries can be retrieved in /var/log/syslog* files or by querying the system journal.

This machine does not like temperatures above 60.0 C.

What did you mean by that?

Regards, Jože



EDIT: TLP is installed in my LM20.2. That may be relevant.
EDIT2: I disabled TLP and rerun tests. No significant differences.