On Sat, Nov 6, 2021 at 12:52 AM Andreas Kemnade [off-list ref] wrote:

Hallo Alistair,

my Xorg (debian buster installation) does not like that:
[  3112.462] (**) cyttsp5: Applying InputClass "evdev touchscreen catchall"
[  3112.462] (**) cyttsp5: Applying InputClass "libinput touchscreen catchall"
[  3112.462] (II) Using input driver 'libinput' for 'cyttsp5'
[  3112.463] (**) cyttsp5: always reports core events
[  3112.463] (**) Option "Device" "/dev/input/event1"
[  3112.463] (**) Option "_source" "server/udev"
[  3112.496] (II) event1  - cyttsp5: is tagged by udev as: Touchscreen
[  3112.498] (EE) event1  - cyttsp5: kernel bug: device has min == max on ABS_X
[  3112.498] (II) event1  - cyttsp5: was rejected
[  3112.498] (II) event1  - not using input device '/dev/input/event1'.
[  3112.499] (EE) libinput: cyttsp5: Failed to create a device for /dev/input/event1

# evtest /dev/input/event1
Input driver version is 1.0.1
Input device ID: bus 0x0 vendor 0x0 product 0x0 version 0x0
Input device name: "cyttsp5"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 2 (EV_REL)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value      0
      Min        0
      Max        0 <-- upsets xorg
    Event code 1 (ABS_Y)
      Value      0
      Min        0
      Max        0
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max       31
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
    Event code 49 (ABS_MT_TOUCH_MINOR)
      Value      0
      Min        0
      Max      255
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1447
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     1071
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
    Event code 58 (ABS_MT_PRESSURE)
      Value      0
      Min        0
      Max      255

I specified touchscreen-size-x and touchscreen-size-y in my devicetree.
No idea why it is like this yet.

Thanks! I see the same problem on my side as well. I'm not using X so
I don't see a crash and didn't notice the error.

I'll work on fixing this.

Alistair