Griffin Powermate evdev setup

Dan Nicholson dbn.lists at
Tue Apr 28 08:55:21 PDT 2009

On Tue, Apr 28, 2009 at 8:00 AM, Phil Endecott
<spam_from_xorg at> wrote:
> Dan Nicholson wrote:
>> On Tue, Apr 28, 2009 at 2:33 AM, Phil Endecott
>> <spam_from_xorg at> wrote:
>>> Peter Hutterer wrote:
>>>> On Mon, Apr 27, 2009 at 12:09:17AM +0100, Phil Endecott wrote:
>>>>>      Option          "DIALRelativeAxisButtons" "4 5"
>>>> This option isn't supported anymore.
>>> OK.  I think something like this is needed, though.  If you have an
>>> application that actually "knows" about the dial axis that's fine, but
>>> in most cases you'll want to do some sort of mapping.  I don't see any
>>> mention of the mouse scroll wheel in the new evdev man page; how is
>>> that managed?
>> Read the description for EmulateWheel in evdev(4).
> Ah OK - I don't have that in my (Debian packaged) man evdev, so I guess it's
> a recent addition.  My man page claims to be version 2.0.8.  EmulateWheel is
> what I have for my real mouse so it should do what I need.  (I do sometimes
> wonder whether more apps now work with a non-emulated wheel; when I scroll
> Firefox with my emulated wheel (or the Powermate on the old machine) it
> would take ages to catch up.  I should try it.  Maybe I need some hack so
> that some apps see the emulated events and others see axis events.)

Apps just see events from X. They have no idea how they got produced.

I use an emulated wheel on the trackpoint for my thinkpad, and it
works fine. If you're talking about scrolling the page in firefox,
it's probably the graphics that are lagging. On a local server, I
really doubt that the wheel events are taking too long to get there
unless it's something the driver is deliberately doing. If you're
concerned about this, just run xev and see if the events are really
lagging behind the hardware.

>>> Event: time 1240909109.149823, type 2 (Relative), code 7 (Dial), value -1
>>> Event: time 1240909109.149839, -------------- Report Sync ------------
>>> Event: time 1240909109.357821, type 2 (Relative), code 7 (Dial), value 1
>> Is -1 turning the dial to the left and +1 turning the dial to the right?
> Yes.

Then once the probing gets straightened out, you should be good to go.


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