linux-kernel - Re: [bug?] Battery notifications produce flashing battery icon, syslog spam (Re: [PATCH 11/11] ACPI / Battery: Update information on info notification and resume)

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Message-Id: <201205012142.55664.post@ralfj.de>
Date:	Tue, 1 May 2012 21:42:55 +0200
From:	Ralf Jung <post@...fj.de>
To:	Jonathan Nieder <jrnieder@...il.com>
Cc:	Adrian Fita <adrian.fita@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Paolo Scarabelli <paolo@....it>,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [bug?] Battery notifications produce flashing battery icon, syslog spam (Re: [PATCH 11/11] ACPI / Battery: Update information on info notification and resume)

Hi,

in addition to the constant flickering when running on AC, there is a more 
"high frequency" flickering immediately after plugging in the AC: For some 5 
to 10 seconds, the battery appears and disappears (according to upower) around 
once per second. There's also a short moment without battery after plugging 
out the AC.
All this is gone after going to a kernel version without this patch applied.

I did not notice unusual high CPU usage of upower on my system, however I 
noticed disc activity - according to iotop, upower is writing several MiB of 
data per minute to /var/lib/upower/ where it keeps some battery statistics. I 
do not know whether this is out of the ordinary.

Kind regards,
Ralf

On Tuesday 01 May 2012 21:14:08 Jonathan Nieder wrote:
> (cc-ing Andy)
> 
> Adrian Fita wrote:
> > Also, searching on Google after "upowerd device
> > removed:/org/freedesktop/UPower/devices/battery_BAT0", reveals much
> > more bug reports with the exact issue.
> 
> Thanks.  That confirms the high CPU consumption in upowerd ---
> see [1], for example.
> 
> [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/987807
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