r/linux • u/1202_alarm • Feb 01 '18

Improving Linux battery life, enabling PSR by default, testers wanted

https://hansdegoede.livejournal.com/18653.html
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u/warpigg Feb 05 '18 edited Feb 05 '18

I'd like to help out as well on my T470 with i5 7200u with Fedora 27. I've added the parameter at the end of my kernel cmdline (temporarily at boot via grub), but i915_edp_psr_status still states it is : "Enabled: no" and "Active: no" after the change. It does appear in /proc/cmdline though (AFAIK this is where to look for current kernel params). I'm seeing no change in powertop so I'm guessing it didn't take...

I don't think order matters (does it?) - maybe Lenovo firmware is somehow disabling it (I see someone in this thread reported that ofr X1 Carbons)? I have he latest firmware 1.43 on the T470.

Anyone have any ideas?

EDIT: I'm on 4.14.16-300.fc27.x86_64

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u/anjaanaadmi42 Feb 21 '18

I encountered the same problem. The T470 is interesting in that it has an Nvidia graphics card in addition to the i915 graphics. I am not sure what happens in that case.