43 lines
1.9 KiB
Markdown
43 lines
1.9 KiB
Markdown
# lenovo-throttling-fix
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Workaround for Linux throttling issues on Lenovo T480 / T480s / X1C6 notebooks as described [here](https://www.reddit.com/r/thinkpad/comments/870u0a/t480s_linux_throttling_bug/).
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This script forces the CPU package power limit (PL1/2) to **44 W** (29 W on battery) and the temperature trip point to **97 'C** (85 'C on battery) by overriding default values in MSR and MCHBAR every 5 seconds (30 on battery) to block the Embedded Controller from resetting these values to default.
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## Requirements
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The python module `python-periphery` is used for accessing the MCHBAR register by memory mapped I/O.
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## Installation
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```
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git clone https://github.com/erpalma/lenovo-throttling-fix.git
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sudo pip install python-periphery
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sudo make install
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sudo systemctl enable lenovo_fix.service
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sudo systemctl start lenovo_fix.service
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```
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## Configuration
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The script can be configured by editing `lenovo_fix.py` directly. There exist two profiles `AC` and `BATTERY`:
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```
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config = {
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'AC': {
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'UPDATE_RATE_SEC': 5, # Update the registers every this many seconds
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'PL1_TDP_W': 44, # Max package power for time window #1
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'PL1_DURATION_S': 28, # Time window #1 duration
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'PL2_TDP_W': 44, # Max package power for time window #2
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'PL2_DURATION_S': 0.002, # Time window #2 duration
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'TRIP_TEMP_C': 97 # Max allowed temperature before throttling
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},
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'BATTERY': {
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'UPDATE_RATE_SEC': 30, # Update the registers every this many seconds
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'PL1_TDP_W': 29, # Max package power for time window #1
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'PL1_DURATION_S': 28, # Time window #1 duration
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'PL2_TDP_W': 44, # Max package power for time window #2
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'PL2_DURATION_S': 0.002, # Time window #2 duration
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'TRIP_TEMP_C': 85 # Max allowed temperature before throttling
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},
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}
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```
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## Disclaimer
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This script overrides the default values set by Lenovo. I'm using it without any problem, but it is still experimental so use it at your own risk.
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