nixos-hardware

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I think this is related to move to "throttled" to fix the intel throttling issue on various laptops.

While trying to use undervolt last night, I realized that something is still overriding the temperature target. Watch:

[cole@xeep:~/code/nixcfg]$ sudo undervolt --temp 97

[cole@xeep:~/code/nixcfg]$ sudo undervolt --read
temperature target: -3 (97C)
core: -99.61 mV
gpu: -75.2 mV
cache: -99.61 mV
uncore: -99.61 mV
analogio: -99.61 mV

# wait a second

[cole@xeep:~/code/nixcfg]$ sudo undervolt --read
temperature target: -5 (95C)
core: -99.61 mV
gpu: -75.2 mV
cache: -99.61 mV
uncore: -99.61 mV
analogio: -99.61 mV

And yet:

● lenovo_fix.service - Stop Intel throttling
   Loaded: loaded (/nix/store/ra5wj7nzkgyxgj5w22fbdjnyxscs9a3w-throttled-0.6/lib/systemd/system/lenovo_fix.service; enabled; vendor preset: enabled)
  Drop-In: /nix/store/ys52kwpvs7b3psrllinzlk0axrckhcs7-system-units/lenovo_fix.service.d
           └─overrides.conf
   Active: active (running) since Thu 2019-11-21 04:06:59 PST; 11h ago
 Main PID: 910 (.lenovo_fix.py-)
       IP: 0B in, 0B out
    Tasks: 2
   Memory: 34.5M
      CPU: 3.425s
   CGroup: /system.slice/lenovo_fix.service
           └─910 /nix/store/gpnm7i19lpj8p43mjrdw03d0hjalmskl-python3-3.7.5/bin/python3.7 /nix/store/ra5wj7nzkgyxgj5w22fbdjnyxscs9a3w-throttled-0.6/bin/.lenovo_fix.py-wrapped

Nov 21 04:06:59 xeep systemd[1]: Started Stop Intel throttling.
Nov 21 04:06:59 xeep lenovo_fix.py[910]: [I] Detected CPU architecture: Intel Kaby Lake (R)
Nov 21 04:06:59 xeep lenovo_fix.py[910]: [I] Loading config file.
Nov 21 04:06:59 xeep lenovo_fix.py[910]: [I] Starting main loop.

I guess it looks like throttled can do undervolting as well. Maybe I should only use one or the other.

It also appears that throttled might default to a trip target of 95C, which would explain the behavior I'm seeing.

Further, throttled's docs say that it might not be okay to run with thermald at the same time.

This might be relevant to the 9370 config, as it enables thermald and throttled.

https://github.com/NixOS/nixos-hardware/pull/127 was the PR for that