Hi Peter,
>> /* Tool on the tablet when driver starts. This sometime causes
>> * access errors to the device */
>> - if (pDev && !miPointerGetScreen(pDev->dev))
>> + if (pDev && (!pDev->dev || !miPointerGetScreen(pDev->dev)))
>> {
>> xf86Msg(X_ERROR, "wcmEvent: Wacom driver can not get
>> Current Screen ID\n");
>> xf86Msg(X_ERROR, "Please remove Wacom tool from the tablet and
>> bring it back again.\n");
> this is a larger bug we don't have a good solution to yet. it's essentially
> a race condition between hotplugged devices due to the way how
> NewInputDeviceRequest works in the server. NIDR adds and immediately enables
> the devices including adding them to the select loop and receiving events
> for them.
thanks for your reply! I am by now means knowledgeable about
linuxwacom or X internals (first got a graphics tablet yesterday..),
but I can tell you that the above band-aid works reliably for me,
whereas I repeatably get a crash of X at startup without it.
As miPointerGetScreen() will always segfault when being handed a
NULL-pointer I think the above test makes sense. Moreover, after the
two xf86Msg()s there is a return statement that bails us out early
from commonDispatchDevice() before other code assuming a valid
pDev->dev is executed..
In testing this I have also noticed that is not even necessary to lift
the pen from the surface and bring it back again (as the xf86Msgs
suggest) - but simply waiting till X is up is enough, and I can
immediately use the pen to navigate.
Please consider including the patch for the time being.
greetings
Gottfried
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