Celeron 2955U (on Acer C720) results

[nariox]

Using -60 -80 -100. I did some testing, I can get -85 -95 -120 (tested individually) running for a while, but not stable in the long run). Overall, the gains are small, but measurable (went from 8ish hours to 9ish hours on regular use). The iGPU is the big power sink, so I think it's best to use it when measuring a laptop with iGPU. Also, mprime seem to be put out more heat than sysbench, so I decided to use it instead.

Using mprime -t: Temp drop minimally from ~64C to ~63C Package power usage drops from 8.7W to 7.9W

Using furmark: Temps drop from ~80C to ~74C, but it still throttles Package power usage drops from 17.6W to 15.5W

Using mprime -t and furmark: Temps drop from ~80C to ~74C, but it still throttles Package power usage drops from 18.7W to 17.7W

s-tui was used to monitor the wattage and temperatures. System: Archlinux on 4.16.11-1-zen

[ebm539]

What firmware are you using? I'm using John Lewis's firmware (SeaBIOS) version 4.0-6588-g4acd8ea-dirty 09/04/2014

With -60 -80 -100:

wrote 0x80000011F8600000 successful to plane index 0
wrote failed, got: 100f5c00000
wrote failed, got: 200f3400000

[ebm539]

@nariox

[nariox]

Hi @ebm539 , I also get the error, but the setting seems to be applied. I've since switched to intel-undervolt because it lets me read the current settings, and even after using iuvolt to set the new offsets, intel-undervolt reports the changed options. Using rapl-plot also reports reduced power.