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List:       kde-devel
Subject:    Re: PowerManagement changing hard disk settings
From:       "Roman Jarosz" <kedgedev () gmail ! com>
Date:       2010-07-31 7:50:16
Message-ID: op.vgo6p2aqasvm2a () localhost
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On Sat, 31 Jul 2010 01:52:53 +0200, Arno Rehn <kde-devel@arnorehn.de>  
wrote:

> On Thursday 29 July 2010 21:02:39 Roman Jarosz wrote:
>> Hi,
>>
>> when I have switched to KDE 4.5. I've notice that the system lags a lot,
>> and after some debugging (and almost going back to 4.4) I found out that
>> PowerManagemet is always changing the APM_level of my /dev/sda disk to  
>> 1,
>> which mostly parks the disk heads cca. every 5 seconds during normal  
>> work.
>>
>> This is really bad because I have to wait 1-2s till the heads are  
>> unparked,
>> but what's even worse that I can't find any option how to disable it.
>>
>> I would like to ask if I can disable it somewhere, or if I have to hack  
>> it
>> in code?
>> Also IMHO so aggressive power saving shouldn't be forced by default.
> I found that pm-utils 1.4.0 triggers that exact behaviour (or maybe  
> there's a
> communication error between PowerDevil and pm-utils/hal). But it  
> occasionally
> also happened without a running KDE session. I reverted to pm-utils 1.3  
> and
> everything was fine again.

I have pm-utils-1.4.1, so maybe it is some miscommunication between
PowerDevil and pm-utils/hal, will try to check it tomorrow.

It would be good If somebody could tell me where should I be looking
(commenting out code).

Thanks
Roman
 
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