Re: [PATCH] lis3lv02d: provide means to disable polled inputinterface

[Marcin Derlukiewicz]

Dnia 09-04-2010 o 15:32:59 Jiri Kosina <jkosina@xxxxxxx> napisaÅ(a):

> On Fri, 9 Apr 2010, Ãric Piel wrote:
>
> > > This is reported to create 20% CPU usage increase (and proportionaly  
> > higher
> > > power consumption) just for the ipolldevd kernel thread (which is used
> > > to read the sensor).
> > >
> > > As most users probably only use the freefall functionality of the  
> > driver
> > > and not the joystick interface, provide means for disabling the  
> > registration
> > > of joystick device altogether via module parameter.
> > > (I'd rather make it default to 0, but this will break backwards  
> > compatibility).
> > Are you saying there is a 20% CPU usage even when the joystick interface
> > is not open? This should not happen (and this is not happening on my
> > laptop). The polling should happen only when a userspace app opens the
> > joystick interface (like running neverball).
> >
> > So I'd tend to think it's more due to a misconfiguration of the system
> > (like xserver using the joystick interface as a pointer device) or it's
> > a bug in the way we set up the polling. Could you investigate and let me
> > know?
>
> Marcin originally reported this to me.
>
> Marcin, could you please check 'lsof' output to see whether the joystick
> interface has been open by some application?
>
> Thanks,

sorry for the delay, had a crunch time

here is the link for this lsof:
https://bugzilla.novell.com/attachment.cgi?id=354953


Best regards,
Marcin.
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