From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nils Gillmann <ng0@n0.is>
Subject: Re: Does Linux 4.16.1 blast out battery time? (9h+ -> 3h+)
Date: Tue, 8 May 2018 21:11:08 +0000
Message-ID: <20180508211108.dhahlvreutqujxtb@abyayala>
References: <871sfjprn8.fsf@gmail.com> <20180413065059.6tvg2xsx722adl7i@doom>
	<87k1tb8srn.fsf@gmail.com> <871sfjtnuy.fsf@gmail.com>
	<87k1sx2e61.fsf@gnu.org> <87d0yo3fs7.fsf@gmail.com>
	<87tvrpqlu8.fsf@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Return-path: <help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:58857)
	by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <ng0@n0.is>)
	id 1fG9si-0007iA-V9
	for help-guix@gnu.org; Tue, 08 May 2018 17:10:45 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <ng0@n0.is>) id 1fG9sh-0004i7-Uf
	for help-guix@gnu.org; Tue, 08 May 2018 17:10:44 -0400
Content-Disposition: inline
In-Reply-To: <87tvrpqlu8.fsf@gmail.com>
List-Id: <help-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-guix>,
	<mailto:help-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-guix/>
List-Post: <mailto:help-guix@gnu.org>
List-Help: <mailto:help-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-guix>,
	<mailto:help-guix-request@gnu.org?subject=subscribe>
Errors-To: help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org
Sender: "Help-Guix" <help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org>
To: Pierre Neidhardt <ambrevar@gmail.com>
Cc: help-guix@gnu.org

Pierre Neidhardt transcribed 1.0K bytes:
> 
> I've re-tested with 4.16.6: still happening, the battery life is about
> 50% down.
> 
> If I blacklist the nouveau kernel module, then the module stops crashing
> in loop, which improves battery time a little bit, but the difference
> with 4.15 is still startling.
> 
> Note that blacklisting the nouveau kernel module has the side effect of
> preventing the kernel from putting the video card to sleep, which drains
> the battery even more.
>
> --
> Pierre Neidhardt


Out of Guix suppport scope, but I have a mainboard (not with nouveau)
which showed problems with a certain 4.x version of Linux[1]. The debug
sugesstion by Intel is to configure and run the drm-tip branch[0] of
the kernel. I can't advocate how to package or do this here (which is
too bad), but for all things graphics related this will be suggested
by upstream most certainly.


0: branch as in the repository, not linux repository itself. In case you
   are unfamilar with linux development branching model.
1: Variants of https://bugs.freedesktop.org/buglist.cgi?quicksearch=i915%20intel_cpu_fifo_underrun_irq_handler&list_id=579081
   and this is still going on.