The behaviour in gdm3 alone (outside of a user session) is different from tablet to tablet.

* Wacom Intuos5 USB: no crashes, pen functions as a second crosshair pointer * HUION H610PRO USB: no crashes, pen functions as a second crosshair pointer * Genius EasyPen i405X USB: crashes gnome-session in this environment as well, repeatedly, same segfault from gnome-shell. systemd appears to be desperately trying to launch Xorg instead afterwards? Which then *also* segfaults repeatedly.


The Huion and Wacom tablets work inside GNOME-on-Wayland user sessions, and gtk3-demo's "Touch and Drawing Tablets" module presents their extra axes (pressure, or pressure+tilt+distance, respectively). However using Wayland is not really a great workaround currently given how crashy it is (xwayland 2:1.18.4-1, pressing Alt kills Chromium, wow.)

The Genius tablet is well known as a horrid crashy mess generally, which is why I bought it. This behaviour is new even for that, however.

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Sep 18 03:17:32 spatula kernel: [50703.338856] usb 2-1: new low-speed USB device number 35 using xhci_hcd Sep 18 03:17:32 spatula kernel: [50703.532827] usb 2-1: New USB device found, idVendor=0458, idProduct=5010 Sep 18 03:17:32 spatula kernel: [50703.532834] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Sep 18 03:17:32 spatula kernel: [50703.532838] usb 2-1: Product: EasyPen i405X Sep 18 03:17:32 spatula kernel: [50703.532841] usb 2-1: Manufacturer: Genius Sep 18 03:17:32 spatula kernel: [50703.561689] input: Genius EasyPen i405X as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:0458:5010.0040/input/input175 Sep 18 03:17:32 spatula kernel: [50703.615183] kye 0003:0458:5010.0040: input,hiddev0,hidraw2: USB HID v1.11 Device [Genius EasyPen i405X] on usb-0000:00:14.0-1/input0 Sep 18 03:17:32 spatula mtp-probe: checking bus 2, device 35: "/sys/devices/pci0000:00/0000:00:14.0/usb2/2-1" Sep 18 03:17:32 spatula mtp-probe: bus: 2, device: 35 was not an MTP device Sep 18 03:17:33 spatula gnome-shell[29393]: Could not get tablet information for 'Genius EasyPen i405X': (null) Sep 18 03:17:33 spatula kernel: [50704.317185] gnome-shell[29393]: segfault at 10 ip 00007fd62869e844 sp 00007ffe16cebae0 error 4 in libwacom.so.2.5.0[7fd62869b000+9000]
Sep 18 03:17:33 spatula org.gnome.Shell.desktop[29393]: (EE)
Sep 18 03:17:33 spatula org.gnome.Shell.desktop[29393]: Fatal server error: Sep 18 03:17:33 spatula org.gnome.Shell.desktop[29393]: (EE) failed to dispatch Wayland events: Broken pipe
Sep 18 03:17:33 spatula org.gnome.Shell.desktop[29393]: (EE)
[... one more segfault ...]
Sep 18 03:17:35 spatula gdm3: Child process -29545 was already dead.
Sep 18 03:17:35 spatula gdm3: Child process 29534 was already dead.
Sep 18 03:17:35 spatula gdm3: Unable to kill session worker process
Sep 18 03:17:35 spatula systemd[1]: Started Session c22 of user Debian-gdm. Sep 18 03:17:35 spatula udev-acl.ck[29583]: g_slice_set_config: assertion 'sys_page_size == 0' failed Sep 18 03:17:35 spatula /usr/lib/gdm3/gdm-x-session[29582]: (--) Log file renamed from "/var/lib/gdm3/.local/share/xorg/Xorg.pid-29585.log" to "/var/lib/gdm3/.local/share/xorg/Xorg.0.log" Sep 18 03:17:35 spatula /usr/lib/gdm3/gdm-x-session[29582]: X.Org X Server 1.18.4 Sep 18 03:17:35 spatula /usr/lib/gdm3/gdm-x-session[29582]: Release Date: 2016-07-19 Sep 18 03:17:35 spatula /usr/lib/gdm3/gdm-x-session[29582]: X Protocol Version 11, Revision 0
[... starts up, then a stream of new segfaults ...]
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