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Francesco Palmarini
2018-04-02 20:51:30 +02:00
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# lenovo-throttling-fix
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/).
This script forces the CPU package power limit (PL1/2) to **45 W** and the temperature trip point to **97 C** by overriding default values in MSR and MCHBAR every 15 seconds to block the Embedded Controller from resetting these values to default.
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.
## Requirements
The python module `python-periphery` is used for accessing the MCHBAR register by memory mapped I/O.
@@ -15,5 +15,28 @@ sudo systemctl enable lenovo_fix.service
sudo systemctl start lenovo_fix.service
```
## Configuration
The script can be configured by editing `lenovo_fix.py` directly. There exist two profiles `AC` and `BATTERY`:
```
config = {
'AC': {
'UPDATE_RATE_SEC': 5, # Update the registers every this many seconds
'PL1_TDP_W': 44, # Max package power for time window #1
'PL1_DURATION_S': 28, # Time window #1 duration
'PL2_TDP_W': 44, # Max package power for time window #2
'PL2_DURATION_S': 0.002, # Time window #2 duration
'TRIP_TEMP_C': 97 # Max allowed temperature before throttling
},
'BATTERY': {
'UPDATE_RATE_SEC': 30, # Update the registers every this many seconds
'PL1_TDP_W': 29, # Max package power for time window #1
'PL1_DURATION_S': 28, # Time window #1 duration
'PL2_TDP_W': 44, # Max package power for time window #2
'PL2_DURATION_S': 0.002, # Time window #2 duration
'TRIP_TEMP_C': 85 # Max allowed temperature before throttling
},
}
```
## Disclaimer
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.