The HAL daemon used by RHEL6/CentOS6 does not play nicely with input devices that advertise unsupported EV_SW events. Devices with such an event will fail in the middle of the probe process, preventing the X server from being able to hotplug the device. The SW_MUTE_DEVICE event used by the Cintiq Pro touchscreen is such an event.
To work around this limitation, we can define an fdi configuration file which resets the "button.has_state" property prior to probe. Because HAL only runs the failing code when this property is true, the device is able to finish the probe process just as though it never had the unsupported switch in the first place. Resetting this property does prevent HAL from being able to monitor the switch state, but that is not considered a problem. Signed-off-by: Jason Gerecke <jason.gere...@wacom.com> --- conf/Makefile.am | 2 ++ conf/wacom-preprobe.fdi | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) create mode 100644 conf/wacom-preprobe.fdi diff --git a/conf/Makefile.am b/conf/Makefile.am index 5db206e..1fd7988 100644 --- a/conf/Makefile.am +++ b/conf/Makefile.am @@ -6,7 +6,9 @@ endif if USE_HAL_FDI fdipolicydir = $(datadir)/hal/fdi/policy/20thirdparty +fdipreprobedir = $(datadir)/hal/fdi/preprobe/20thirdparty dist_fdipolicy_DATA = wacom.fdi +dist_fdipreprobe_DATA = wacom-preprobe.fdi endif if HAVE_SYSTEMD_UNIT_DIR diff --git a/conf/wacom-preprobe.fdi b/conf/wacom-preprobe.fdi new file mode 100644 index 0000000..b23f452 --- /dev/null +++ b/conf/wacom-preprobe.fdi @@ -0,0 +1,17 @@ +<?xml version="1.0" encoding="UTF-8"?> + +<deviceinfo version="0.2"> + <device> + + <!-- Some Wacom devicees (e.g. Cintiq Pro) have an EV_SW event which is + unsupported by HAL. To prevent the input prober from failing + on this event (hal/hald/linux/probing/probe-input.c:79) we + should pretend that it doesn't exist. --> + <match key="info.capabilities" contains="button"> + <match key="info.product" contains_outof="Wacom;WACOM"> + <merge key="button.has_state" type="bool">false</merge> + </match> + </match> + + </device> +</deviceinfo> -- 2.15.1 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linuxwacom-devel mailing list Linuxwacom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
