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Re: Does Linux 4.16.1 blast out battery time? (9h+ -> 3h+)

From: Pierre Neidhardt
Subject: Re: Does Linux 4.16.1 blast out battery time? (9h+ -> 3h+)
Date: Tue, 24 Apr 2018 18:47:12 +0530
User-agent: mu4e 1.0; emacs 26.1

Ludovic Courtès <address@hidden> writes:

> That sounds worrying.  Could you report it upstream?

I'll will.  After further investigation, it turns out that nouveau keeps
crashing in loop, which overwhelms the kernel.  Everything is extremely
unresponsive, I suppose because the kernel scheduler cannot allocate
much time to the user land processes.

This explains the power drain.

`dmesg' shows a sequence of [nouveau] errors in loop, but I haven't
managed to capture it so far because the system freezes too soon.

>> By the way, how do I make the above /sys/ tweak permanent on GuixSD?
> You could do something like:
>   (simple-service 'my-/sys-tweaks activation-service-type
>                   #~(call-with-output-file "/sys/…"
>                       (lambda (port)
>                         (display "1" port))))

I just tried your suggestion and it results in a kernel panic (on Linux
I get a "No such file or directory" error.  I suppose that is because
the service is run too early.

> That said, we should probably build a higher-level
> ‘/sys-tweaks-service-type’ where we could directly pass pairs of file
> name/values.
> Would you like to give it a try?

Sure, whenever I have some more free time (in a week or so).

Pierre Neidhardt

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