Hello Julien,
sorry for the late answer, was on a conference last week.
Julien Cristau [2010-01-08 21:37 +0000]:
> On Fri, Jan 8, 2010 at 18:57:28 +0000, Julien Cristau wrote:
>
> > Apparently loading evdev on accelerometers results in a mouse cursor
> > stuck in the center of the screen. Not sure if we should somehow
> > blacklist these devices from the udev rules, or if the driver should be
> > smarter.
> >
> Peter, would you have any idea how to handle the above issue?
>
> Martin, the kernel seems to assign a js (joystick?) handler to that
> device. Should udev set ID_INPUT_JOYSTICK here?
I don't think it should. At least hal and udev define a joystick as an
input device which as absolute X/Y axes _and_ a button (BTN_TRIGGER,
BTN_A, or BTN_1). Supposedly the kernel is too sloppy here and just
checks for absolute axes?
> E: SUBSYSTEM=input
> E: ID_INPUT=1
> E: x11_driver=evdev
I wonder which rule assigns this. At least in Ubuntu,
/lib/udev/rules.d/65-xorg-evdev.rules looks like
-------------- 8< ------------------
ACTION!="add|change", GOTO="xorg_evdev_end"
# By default, we use the -evdev driver for every mouse, keyboard, touchscreen
# or touchpad; later rules can then change the driver for specific input
# devices.
ENV{ID_INPUT}=="", GOTO="xorg_evdev_end"
ENV{ID_INPUT_MOUSE}=="?*", ENV{x11_driver}="evdev"
ENV{ID_INPUT_KEY}=="?*", ENV{x11_driver}="evdev"
ENV{ID_INPUT_TOUCHSCREEN}=="?*", ENV{x11_driver}="evdev"
ENV{ID_INPUT_TOUCHPAD}=="?*", ENV{x11_driver}="evdev"
LABEL="xorg_evdev_end"
-------------- 8< ------------------
I. e. it does _not_ assign evdev to any ID_INPUT device, just to
known types. In particular, it doesn't use evdev for joysticks either,
since the perception was that this is too confusing. Such a rule could
be shipped by xserver-xorg-input-joystick.
Do you happen to have a rule which looks like
ENV{ID_INPUT}=="?*", ENV{x11_driver}="evdev"
? If so, my recommendation would be to drop this. We don't need X.org
to listen to obscure devices like your accelerometer or headphone
jacks. Button-type devices like lids are already covered by
ID_INPUT_KEY (which is not the same as _KEYBOARD, NB).
Thanks,
Martin
--
Martin Pitt | http://www.piware.de
Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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