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According to this post on Arch wiki the i915 kernel module has options which result in significant power savings.

How to "pass" the following options to the i915 kernel module?

enable_fbc=1 enable_psr=1 disable_power_well=0

Greg
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    Did you test them? (by putting them on your linux (kernel) line in grub, ie. pressing to edit it, adding them & then press to boot with those entries added... – guiverc Aug 04 '18 at 10:24
  • @guiverc That's pretty cool, didn't know about that but followed instructions and the options have been loaded in. Is the correct way to set the options permanently to edit them in /etc/default/grub? – Greg Aug 04 '18 at 11:21
  • Yep - here is a reference link if you'd like more info (https://wiki.ubuntu.com/Kernel/KernelBootParameters); which includes the useful hint to sudo update-grub to cause re-build your grub file after you've edited. – guiverc Aug 04 '18 at 11:30

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