Comment 23 for bug 1851749

I am affected as well on a Dell P74G Inspiron 7460 with an i7-7500U CPU @ 2.70GHz and an integrated GPU + an Nvidia GPU using the NVidia drivers.

According from information I found here

https://icecat.biz/p/dell/w56752561pth-gld/inspiron-notebooks-7460-33552288.html

the TDPs of my CPU are:

Thermal Design Power (TDP) 15 W
Configurable TDP-up frequency 2.9 GHz
Configurable TDP-up 25 W
Configurable TDP-down 7.5 W

CPU version as read from /proc/cpuinfo:

vendor_id : GenuineIntel
cpu family : 6
model : 142
model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
stepping : 9
microcode : 0xde

From lspci, detail of the GPUs:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)

My Kernel:

uname -a
Linux [redacted] 5.4.0-66-generic #74-Ubuntu SMP Wed Jan 27 22:54:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Output of the commands recommended above:

dmidecode looks odd returning info about WiFi:

sudo dmidecode -H 11
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.
85 structures occupying 5497 bytes.
Table at 0x000E9CA0.

Handle 0x000B, DMI type 8, 9 bytes
Port Connector Information
        Internal Reference Designator: JNGFF1 - WLAN/BT/Wigig CONN
        Internal Connector Type: None
        External Reference Designator: Not Specified
        External Connector Type: None
        Port Type: Other

sudo modprobe msr
sudo rdmsr -f 29:24 -d 0x1a2
2

Reproducing the issue:

stress -c 8
stress: info: [48012] dispatching hogs: 8 cpu, 0 io, 0 vm, 0 hdd

Dmesg output:

[17674.962910] mce: CPU3: Core temperature above threshold, cpu clock throttled (total events = 3987)
[17674.962910] mce: CPU1: Core temperature above threshold, cpu clock throttled (total events = 3986)
[17674.962912] mce: CPU0: Package temperature above threshold, cpu clock throttled (total events = 7491)
[17674.962913] mce: CPU2: Package temperature above threshold, cpu clock throttled (total events = 7491)
[17674.962914] mce: CPU1: Package temperature above threshold, cpu clock throttled (total events = 7487)
[17674.962915] mce: CPU3: Package temperature above threshold, cpu clock throttled (total events = 7491)
[17674.966955] mce: CPU1: Core temperature/speed normal
[17674.966956] mce: CPU3: Core temperature/speed normal
[17674.966957] mce: CPU2: Package temperature/speed normal
[17674.966958] mce: CPU0: Package temperature/speed normal
[17674.966958] mce: CPU3: Package temperature/speed normal
[17674.966960] mce: CPU1: Package temperature/speed normal

Turbostat line being used (NOTE: 100 milliseconds interval):
turbostat --quiet --Summary --show Busy%,Bzy_MHz,PkgTmp,PkgWatt,CorWatt,GFXWatt,Time_Of_Day_Seconds --interval 0.1

Output of turbostat across the beginning of stress:

Time_Of_Day_Seconds Busy% Bzy_MHz PkgTmp PkgWatt CorWatt GFXWatt
1622157712.441769 9.23 795 51 1.75 0.20 0.11
1622157712.542624 10.77 711 52 1.84 0.21 0.12
1622157712.643427 8.98 708 51 1.80 0.17 0.07
1622157712.744178 12.97 746 51 1.90 0.24 0.13
1622157712.850717 13.32 712 51 1.68 0.20 0.11 <--- START STRESS
1622157712.951114 95.99 2587 75 12.69 10.76 0.17
1622157713.051319 99.59 3500 82 19.36 17.56 0.14
1622157713.151571 99.65 3500 85 19.54 17.66 0.18
1622157713.252241 99.65 3500 88 19.76 17.82 0.14
1622157713.352490 99.59 3500 90 19.66 17.76 0.17
1622157713.452694 99.65 3500 90 19.22 17.54 0.08
1622157713.552947 99.59 3500 91 20.09 18.09 0.14

Output of turbostat across the throttle trigger event:
Time_Of_Day_Seconds Busy% Bzy_MHz PkgTmp PkgWatt CorWatt GFXWatt
1622157718.567121 99.65 3500 95 19.97 17.94 0.16
1622157718.667327 99.68 3500 95 19.79 18.05 0.13
1622157718.767572 99.62 3500 95 19.76 17.94 0.13
1622157718.867776 99.65 3500 96 19.81 18.00 0.16
1622157718.968029 99.65 3500 95 20.01 17.98 0.17
1622157719.068238 99.65 3500 96 20.13 18.29 0.17
1622157719.169153 99.65 3500 97 20.35 18.44 0.21
1622157719.269796 99.65 3500 97 20.12 18.24 0.20 <--- THRESHOLD TRIGGERED
1622157719.370056 99.59 3355 90 18.04 15.99 0.18
1622157719.470352 99.53 3117 86 14.53 12.69 0.17
1622157719.572124 99.61 3117 86 14.33 12.56 0.09
1622157719.672498 99.61 3103 85 14.67 12.78 0.16
1622157719.772984 99.63 3118 85 14.46 12.71 0.13
1622157719.873219 99.62 3113 84 14.63 12.71 0.14
1622157719.973515 99.60 3125 85 14.54 12.74 0.13