I'd like to save battery by disabling the ATI discreet graphics in 16.04 LTS, and use only my default power-saving onboard Intel.
Could someone guide me step by step accurately through the process? I've tried creating a script (and using it in etc/lightdm/lightdm.conf but it only led to the CPU being used even more, so I think I might have messed something up.
0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr1:0000:04:00.0
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) 04:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Venus XTX [Radeon HD 8890M / R9 M275X/M375X] (rev ff)
Graphics in use:
lspci -nnk | grep -i vga -A3 | grep 'in use' Kernel driver in use: i915 (Intel)