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erpalma
2018-06-12 19:09:13 +02:00
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commit 358541e57a
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README.md
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# Fix T480 / T480s / X1C6 Throttling on Linux # Fix Intel CPU Throttling on Linux
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/). 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 **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. This script forces the CPU package power limit (PL1/2) to **44 W** (29 W on battery) and the temperature trip point to **95 '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.
### Undervolt Tested and working also for **T580**!
### Undervolt:
The script now also supports **undervolting** the CPU by configuring voltage offsets for CPU, cache, GPU, System Agent and Analog I/O planes. The script will re-apply undervolt on resume from standby and hibernate by listening to DBus signals. The script now also supports **undervolting** the CPU by configuring voltage offsets for CPU, cache, GPU, System Agent and Analog I/O planes. The script will re-apply undervolt on resume from standby and hibernate by listening to DBus signals.
## Requirements ## Requirements
The python module `python-periphery` is used for accessing the MCHBAR register by memory mapped I/O. You also need `dbus` and `gobject` python bindings for listening to dbus signals on resume from sleep/hibernate. The python module `python-periphery` is used for accessing the MCHBAR register by memory mapped I/O. You also need `dbus` and `gobject` python bindings for listening to dbus signals on resume from sleep/hibernate.
### Secure Boot:
Right now it is mandatory to **disable Secure Boot** (in BIOS) in order to avoid [Kernel Lockdown](https://lwn.net/Articles/706637/). In particular Lockdown restricts access to MSR and PCI BAR (via /dev/mem) which are required by this script.
### Update:
The scripts is now running with Python3 by default (tested w/ 3.6) and a virtualenv is automatically created in `/opt/lenovo_fix`. Python2 should probably still work.
## Installation ## Installation
``` ```
sudo apt install git virtualenv build-essential python3-dev libdbus-glib-1-dev libgirepository1.0-dev libcairo2-dev
git clone https://github.com/erpalma/lenovo-throttling-fix.git git clone https://github.com/erpalma/lenovo-throttling-fix.git
sudo -H pip install python-periphery sudo ./install.sh
sudo apt install python-dbus python-gobject
sudo make install
sudo systemctl enable lenovo_fix.service
sudo systemctl start lenovo_fix.service
``` ```
## Configuration ## Configuration

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install.sh
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cp requirements.txt lenovo_fix.py "$INSTALL_DIR" cp requirements.txt lenovo_fix.py "$INSTALL_DIR"
cd "$INSTALL_DIR" cd "$INSTALL_DIR"
virtualenv -p /usr/bin/python3 venv virtualenv -p /usr/bin/python3 venv
source venv/bin/activate . venv/bin/activate
pip install -r requirements.txt pip install -r requirements.txt
echo "Enabling and starting systemd service..." echo "Enabling and starting systemd service..."