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From: "Tomáš Čech" <sleep_walker@gnu.org>
To: Pierre Neidhardt <ambrevar@gmail.com>
Cc: help-guix@gnu.org
Subject: Re: Does Linux 4.16.1 blast out battery time? (9h+ -> 3h+)
Date: Fri, 13 Apr 2018 08:50:59 +0200	[thread overview]
Message-ID: <20180413065059.6tvg2xsx722adl7i@doom> (raw)
In-Reply-To: <871sfjprn8.fsf@gmail.com>

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On Fri, Apr 13, 2018 at 11:36:03AM +0530, Pierre Neidhardt wrote:
>
>I just ran a `guix system reconfigure` yesterday and Guix pulled Linux
>4.16.1.  Upon reboot, my laptop's battery time had changed from 9h+ to
>3h+!  Quite a dramatic regression indeed...
>
>General usage (startup time, etc.) seems to be somewhat slower as well.
>
>As a test, I ran another system reconfigure, changing only the kernel
>version: now on 4.14.33, I'm back to 9h+.
>
>Does anyone know something about this or should I reach out for the
>Linux mailing list?
>
>Note that before installing GuixSD, I was running Void Linux with kernel
>~4.14.5 (off the top of my head) and battery time was 12h+.  This might
>be due to the discrete Nvidia card which was completely shut off by
>default, while it's now running with nouveau on GuixSD but I don't know
>how to turn it off.
>
>Insights?

I'm not aware of any regression but I'd recommend to install powertop
and check, which processes are preventing CPU from switching to power
saving modes.

Sometimes it provides interesting results - I usually can spend like
40% more time on battery by closing Icecat and Pavucontrol.

It also can help you with tuning common power management controls.

Best regards,

S_W

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  reply	other threads:[~2018-04-13  6:51 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-13  6:06 Does Linux 4.16.1 blast out battery time? (9h+ -> 3h+) Pierre Neidhardt
2018-04-13  6:50 ` Tomáš Čech [this message]
2018-04-13  7:33   ` Pierre Neidhardt
2018-04-13 10:14     ` Pierre Neidhardt
2018-04-24  8:37       ` Ludovic Courtès
2018-04-24 13:17         ` Pierre Neidhardt
2018-05-03  6:45           ` Pierre Neidhardt
2018-05-08 21:11             ` Nils Gillmann
2018-05-09  7:20               ` Pierre Neidhardt
2018-05-09  8:19                 ` Nils Gillmann

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