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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Date:	Wed, 02 May 2012 19:49:11 +0800
From:	Paolo Scarabelli <paolo@....it>
To:	Ralf Jung <post@...fj.de>
CC:	Jonathan Nieder <jrnieder@...il.com>,
	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>,
	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,

I have the same problem on kernel 3.2.0 (actually I have the same
problem with all kernels I tried since reporting the issue the first time).

I'm almost sure this is related to several Debian bugs open for upower:
#606414, #596721 and #619343.

Is it possible that the high cpu problem with upowerd is caused just to
the log size increasing too much when the laptop is left on for a long time?

In my laptop upowerd starts using a lot of cpu only when I leave it on
overnight.


Regards,


Paolo


On 05/02/2012 03:42 AM, Ralf Jung wrote:
> 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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