Blacklisting an Input Device

[Peter Hutterer]

On Wed, Dec 29, 2010 at 05:23:08PM -0600, Gabriel M. Beddingfield wrote:
> Hi Peter,
> 
> On Wednesday, December 29, 2010 04:55:55 pm Peter Hutterer 
> wrote:
> > > However, I wonder if the attached patch to
> > > xf86-input-evdev might be appropriate.
> [snip]
> > 
> > no, there's a few devices that only have wheel axes and
> > they need to keep working. Note that the "configured as
> > mouse" message is probably misleading, it simply means
> > that evdev will use the relative axes. your problem is
> 
> OK.
> 
> > that 0/0 coordinates are sent and we need to figure out
> > why. do you see the 0/0 coordinates when you run evtest
> > against the device? if so, then the kernel driver needs
> > fixing (or quirking). otherwise, it's either evdev or
> > the server.
> 
> Well, it's supposed to send data... it's just not supposed 
> to be /coordinate/ data for the X Server.  It's supposed to 
> be MIDI-related data for jog wheels and volume levels and 
> whatnot.  It wasn't a problem in older versions of X11 
> because it would be ignored (since it didn't have axes AND 
> buttons).

what's the evtest output then? the driver shouldn't post random axes as x/y.

> So, looks like I need to change the kernel driver... to 
> prevent it from appearing to the X Server as any sort of HID 
> device.

mind you, the better option still seems to be to blacklist the device for
evdev using xorg.conf snippets. other processes may want to use the device
as HID device.

Cheers,
  Peter