4 ms·

Battery life is bad overall for this, at least on the sister T14s gen1. Is it the same experience for you and what tweaks have you made to increase battery life

by talhah 3y ago

Battery life is bad overall for this, at least on the sister T14s gen1. Is it the same experience for you and what tweaks have you made to increase battery life? According to this thread we might never get AMD pstate driver working. https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pstate-driver-support-for-AMD-laptops/m-p/5135917?page=6 https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pst...

pimeys 3y ago
I enabled the pstate driver yesterday for my T14s gen3 (AMD). It almost doubled my battery life, the fan never spins anymore and it's very very quiet and cool now. You need to specifically enable it in Linux kernel, this is how I did it: https://github.com/pimeys/nixos/commit/17e8a9e2ce4b0f34ef6cf7ab6ca1c00ecb976c58 https://github.com/pimeys/nixos/commit/17e8a9e2ce4b0f34ef6cf... It should also be used together with the `shedutil` governor for the best results.
- talhah 3y ago
  CPPC needs to be enabled in BIOS for this and unfortunately that option isn't present. If you see the thread linked in previous comment, Lenovo has been advised not to enable the feature :/
  - pimeys 3y ago
    Seems to work for me at least: > cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver amd-pstate And, it has a tremendous effect on battery life and the fan speed on the G3. Maybe it doesn't work with previous models?
    - dvd23 3y ago
      As the parent said, apparently AMD recommended not to enable it for that generation [1]. That's the price to pay for having a first gen I suppose... [1] https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pstate-driver-support-for-AMD-laptops/m-p/5135917?page=6#5897327 https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pst...
dvd23 3y ago
Yes battery life is awful since day 1. I initially thought I had a faulty device or something. Apart from that the machine is great, it's really a shame. I tried a lot of various things mentioned in the forum, updated the BIOS, tested plenty of various configurations, to no avail.

by talhah 3y ago

pimeys 3y ago

I enabled the pstate driver yesterday for my T14s gen3 (AMD). It almost doubled my battery life, the fan never spins anymore and it's very very quiet and cool now. You need to specifically enable it in Linux kernel, this is how I did it: https://github.com/pimeys/nixos/commit/17e8a9e2ce4b0f34ef6cf7ab6ca1c00ecb976c58 https://github.com/pimeys/nixos/commit/17e8a9e2ce4b0f34ef6cf... It should also be used together with the `shedutil` governor for the best results.

talhah 3y ago
CPPC needs to be enabled in BIOS for this and unfortunately that option isn't present. If you see the thread linked in previous comment, Lenovo has been advised not to enable the feature :/
- pimeys 3y ago
  Seems to work for me at least: > cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver amd-pstate And, it has a tremendous effect on battery life and the fan speed on the G3. Maybe it doesn't work with previous models?
  - dvd23 3y ago
    As the parent said, apparently AMD recommended not to enable it for that generation [1]. That's the price to pay for having a first gen I suppose... [1] https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pstate-driver-support-for-AMD-laptops/m-p/5135917?page=6#5897327 https://forums.lenovo.com/t5/Other-Linux-Discussions/amd-pst...

dvd23 3y ago

Yes battery life is awful since day 1. I initially thought I had a faulty device or something. Apart from that the machine is great, it's really a shame. I tried a lot of various things mentioned in the forum, updated the BIOS, tested plenty of various configurations, to no avail.