Hi, everybody, I got my hands on a new Intuos graphic tablet (a Wacom Intuos S 2), wich will be supported by the upcomming 4.4 kernel (commit eda01dab53b1126a20da98b5d691f3e55d79f21d). For testing, I compiled and installed 4.4-rc7, with CONFIG_HID_WACOM set. However, connecting the the tablet left me with a broken/hanging X-Server.
Since the problem didn't appear to be rooted in the kernel, I suspected that the userspace driver (xf86-input-wacom, version 0.32) simply lacked support for the new device. I had a look at the sources (commit d9119a8c412926b97fac364d32e2bade47d2c295), found the WacomModelDesc table (wcmUSB.c:177) and convinced myself that the entries for the new devices were, in fact, missing. This wasn't particularly surprising. When looking for uses of the table, I encountered the function usbWcmInit(), which, at one point, iterates over all the entries, looking for an entry with a matching vendor- and model-id. Apparently, the case that the table doesn't contain a matching entry was not considered, causing the crashes/hangs I encountered. Completely ignorant of the overal structure, I wrote a patch (which I will submit) making the function bail out if no matching entry was found. This at least leaves me with a working X-Server after plugging in the new, unsupported hardware. I suspect that there might be a better way. If so, you're welcome to enlighten me. Now, I'd like to know whether anybody is working on the missing bits for the new Intuos devices and, if so, he/she could share (preliminary) patches for testing. Regards, Julian Ganz ------------------------------------------------------------------------------ _______________________________________________ Linuxwacom-devel mailing list Linuxwacom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
