GPU Fan Control

If I'm understanding the documentation correctly the --gpu-temp-retain option should result in hashcat controlling the GPU fans. However, when testing with --gpu-temp-retain=1 there is no affect on the fans when I'd expect them to be set at 100%.

Some system details:

Ubuntu Server 16.04
(2) GeForce GTX 1080
(2) GeForce GTX 1070
OpenCL Version : OpenCL C 1.2 
Driver Version : 381.09

Example run:

$ hashcat64.bin --gpu-temp-retain=1 -m 400 -a 0 -o text.dic test.hash words.txt

HWMon.Dev.#1.....: Temp: 68c Fan: 44% Util: 99% Core: 106MHz Mem:4513MHz Bus:16
HWMon.Dev.#2.....: Temp: 64c Fan: 41% Util: 77% Core:  14MHz Mem:3802MHz Bus:16
HWMon.Dev.#3.....: Temp: 70c Fan: 46% Util: 99% Core:  93MHz Mem:4513MHz Bus:16
HWMon.Dev.#4.....: Temp: 67c Fan: 43% Util: 99% Core: 106MHz Mem:3802MHz Bus:16

-Dave