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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
4.15).
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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