[lm-sensors] [PATCH] lis3lv02d: provide means to disable polled input interface
jkosina at suse.cz
Fri Apr 9 15:32:59 CEST 2010
On Fri, 9 Apr 2010, Éric 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
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?
SUSE Labs, Novell Inc.
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