48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
# thermald configuration tweaked for Surface Pro 5
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- thermald configuration starting point: https://github.com/intel/dptfxtract
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- by default it uses sensor "GEN4", which is for the NVME drive, not good.
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- pch_skylake is a better choice here.
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- Takes care of `surface profile set {low-power|performance}` on power supply events.
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- Restarts thermald on power events to load corresponding thermal profiles.
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- There are 3 thermal profiles here:
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- `thermal-conf.xml.auto.performance`: activated on AC power.
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Runs at peak performance (~25watts) until reaching 60 degrees.
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Stabilized at ~15watts under heavy load.
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- `thermal-conf.xml.auto.mobile`: activated on battery.
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Throttles early for ~15watts.
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Throttles to ~8watts for heavy load.
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Try to keep the device cool.
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- `thermal-conf.xml.auto.cool`: reserved.
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Basically, we are just using RAPL here to throttle the power (in watts), not
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the frequency of the CPU, and it's more fine-grained and aligned with our
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thermal targets.
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See 40-surface-power.rules for more details on how to obtain info about sensors
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and cooling devices.
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## Bonus
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40-surface-power.rules also contains power-related tweaks for:
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- `surface profile`: currently low-power vs. performance
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- Various PCIe powersaving strategies
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- Intel p-state control for turbo-boost
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50-surface.conf contains sysctl tweaks advised by `powertop`.
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## Installation
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- Make sure to install `surface-control`
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- Install `40-surface-power.rules` to `/usr/lib/udev/rules.d/`
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- Install `thermal-conf.xml*` to `/etc/thermald/`
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- `thermal-conf.xml.auto` will be linked dynamically by the udev rule file.
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- Install `thermal-cpu-cdev-order.xml` to `/etc/thermald/`
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- Install `thermald.service` to `/lib/systemd/system/` and overwrite the old one.
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- Maybe install to `/usr/lib/systemd/system/` too.
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- Install `50-surface.conf` to `/etc/sysctl.d/`
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- `systemctl daemon-reload`
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- `systemctl restart udev`
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- `systemctl restart thermald`
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