linux-kernel - Re: [2.6.25-rc1] jerky mouse cursor and randoooom key repeats

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Date:	Sat, 16 Feb 2008 11:09:42 +0100
From:	Gabriel C <crazy@...galware.org>
To:	Mike Galbraith <efault@....de>
CC:	Pavel Machek <pavel@....cz>, Frans Pop <elendil@...net.nl>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [2.6.25-rc1] jerky mouse cursor and randoooom key repeats

Mike Galbraith wrote:
> On Sat, 2008-02-16 at 02:23 +0100, Gabriel C wrote:
>> Pavel Machek wrote:
>>> Hi!
>> Hi ,
>>
>>>> I'd not really done any real workkkk under 2.6.25 yet, but now while running 
>>>> a kernel compile with -j4 (single processor, dual core Pentium D), I see 
>>>> this behavior. The mouse cursor moves a bit jerky and I sometimes get key 
>>>> presses repeated.
>>> I see this one, too... x60, too...
>>>
>> I have that problem on my Dell Precision WorkStation , as soon I stress the box
>> a bit keyboard is going mad.
> 
> Sounds like you may have CONFIG_GROUP_SCHED set?  

Yes it was set to y here.

> Bisection fingered
> 6b2d7700266b9402e12824e11e0099ae6a4a6a79 as the source here.

I can't confirm is that commit because I cannot revert it clean but 
I can confirm there is something wrong with CONFIG_GROUP_SCHED.

( maybe Peter or Ingo knows =) )

Turning CONFIG_GROUP_SCHED off on this box fixes the mouse and keyboard problems. 
( and some other , eg: box doesn't feel 'slow' and 'laggy' anymore )

> 
> 	-Mike
> 

Gabriel
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