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[Launchpad Bug Tracker <1530384@xxxxxxxxxxxxxxxxxx>]

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I ports Ubuntu touch to LG L90 Dual. When I upgraded my device from
20151218.1 to 20151221 (channel rc-proposed), the touchscreen stopped
working. A discussion in IRC with @anpok_ suggesting that it may come
from changing input system to udev/libevdev/libinput.

The following udevadm output is most likely from the Touch Screen:

$ udevadm test-builtin input_id /devices/virtual/input/input0/
calling: test-builtin
=== trie on-disk ===
tool version:          219
file size:         6711498 bytes
header size             80 bytes
strings            1721914 bytes
nodes              4989504 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /etc/systemd/network/00-rmnet-kernel.link
Created link configuration context.
ID_INPUT=1
capabilities/ev raw kernel attribute: b
capabilities/ev decoded bit map:
  bit    0: 0000000B
capabilities/abs raw kernel attribute: 6718000 0
capabilities/abs decoded bit map:
  bit    0: 00000000
  bit   32: 06718000
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 400 0 0 2000000 0 1000 40000800 100000 0 10000000 0
capabilities/key decoded bit map:
  bit    0: 00000000
  bit   32: 10000000
  bit   64: 00000000
  bit   96: 00100000
  bit  128: 40000800
  bit  160: 00001000
  bit  192: 00000000
  bit  224: 02000000
  bit  256: 00000000
  bit  288: 00000000
  bit  320: 00000400
properties raw kernel attribute: 0
properties decoded bit map:
test_key: checking bit block 0 for any keys; found=0
test_key: checking bit block 32 for any keys; found=1
test_key: checking bit block 64 for any keys; found=1
test_key: checking bit block 96 for any keys; found=1
test_key: checking bit block 128 for any keys; found=1
test_key: checking bit block 160 for any keys; found=1
test_key: checking bit block 192 for any keys; found=1
test_key: checking bit block 224 for any keys; found=1
ID_INPUT_KEY=1
Unload module index
Unloaded link configuration context.

The driver claims that is provides the multi touch axis touch major,
touch minor, tracking id, x, y, tool type and slot id. So apart from
missing properties like DIRECT it seems to be a normal touch screen, but
udev clearly does not detect it properly.


----------------------------------------------------------
The other devices are probably not the touchscreen...

$ udevadm test-builtin input_id /devices/gpio_keys.70/input/input2/
calling: test-builtin
=== trie on-disk ===
tool version:          219
file size:         6711498 bytes
header size             80 bytes
strings            1721914 bytes
nodes              4989504 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /etc/systemd/network/00-rmnet-kernel.link
Created link configuration context.
ID_INPUT=1
capabilities/ev raw kernel attribute: 3
capabilities/ev decoded bit map:
  bit    0: 00000003
capabilities/abs raw kernel attribute: 0
capabilities/abs decoded bit map:
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 4000000 0 0 0 c0040 0 0 0
capabilities/key decoded bit map:
  bit    0: 00000000
  bit   32: 00000000
  bit   64: 00000000
  bit   96: 000C0040
  bit  128: 00000000
  bit  160: 00000000
  bit  192: 00000000
  bit  224: 04000000
properties raw kernel attribute: 0
properties decoded bit map:
test_key: checking bit block 0 for any keys; found=0
test_key: checking bit block 32 for any keys; found=0
test_key: checking bit block 64 for any keys; found=0
test_key: checking bit block 96 for any keys; found=1
test_key: checking bit block 128 for any keys; found=1
test_key: checking bit block 160 for any keys; found=1
test_key: checking bit block 192 for any keys; found=1
test_key: checking bit block 224 for any keys; found=1
ID_INPUT_KEY=1
Unload module index
Unloaded link configuration context.


$ udevadm test-builtin input_id /devices/virtual/input/input1/
calling: test-builtin
=== trie on-disk ===
tool version:          219
file size:         6711498 bytes
header size             80 bytes
strings            1721914 bytes
nodes              4989504 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /etc/systemd/network/00-rmnet-kernel.link
Created link configuration context.
ID_INPUT=1
capabilities/ev raw kernel attribute: 3
capabilities/ev decoded bit map:
  bit    0: 00000003
capabilities/abs raw kernel attribute: 0
capabilities/abs decoded bit map:
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 100000 0 0 0
capabilities/key decoded bit map:
  bit    0: 00000000
  bit   32: 00000000
  bit   64: 00000000
  bit   96: 00100000
properties raw kernel attribute: 10
properties decoded bit map:
  bit    0: 00000010
test_key: checking bit block 0 for any keys; found=0
test_key: checking bit block 32 for any keys; found=0
test_key: checking bit block 64 for any keys; found=0
test_key: checking bit block 96 for any keys; found=1
test_key: checking bit block 128 for any keys; found=1
test_key: checking bit block 160 for any keys; found=1
test_key: checking bit block 192 for any keys; found=1
test_key: checking bit block 224 for any keys; found=1
ID_INPUT_KEY=1
Unload module index
Unloaded link configuration context.

$ udevadm test-builtin input_id /devices/sound-9302.42/sound/card0/input3/
calling: test-builtin
=== trie on-disk ===
tool version:          219
file size:         6711498 bytes
header size             80 bytes
strings            1721914 bytes
nodes              4989504 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /etc/systemd/network/00-rmnet-kernel.link
Created link configuration context.
ID_INPUT=1
capabilities/ev raw kernel attribute: 3
capabilities/ev decoded bit map:
  bit    0: 00000003
capabilities/abs raw kernel attribute: 0
capabilities/abs decoded bit map:
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 7a 4 0 0 0 c0000 0 0 0
capabilities/key decoded bit map:
  bit    0: 00000000
  bit   32: 00000000
  bit   64: 00000000
  bit   96: 000C0000
  bit  128: 00000000
  bit  160: 00000000
  bit  192: 00000000
  bit  224: 00000004
  bit  256: 0000007A
properties raw kernel attribute: 0
properties decoded bit map:
test_key: checking bit block 0 for any keys; found=0
test_key: checking bit block 32 for any keys; found=0
test_key: checking bit block 64 for any keys; found=0
test_key: checking bit block 96 for any keys; found=1
test_key: checking bit block 128 for any keys; found=1
test_key: checking bit block 160 for any keys; found=1
test_key: checking bit block 192 for any keys; found=1
test_key: checking bit block 224 for any keys; found=1
ID_INPUT_KEY=1
Unload module index
Unloaded link configuration context.

$ udevadm test-builtin input_id /devices/sound-9302.42/sound/card0/input4/
calling: test-builtin
=== trie on-disk ===
tool version:          219
file size:         6711498 bytes
header size             80 bytes
strings            1721914 bytes
nodes              4989504 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /etc/systemd/network/00-rmnet-kernel.link
Created link configuration context.
ID_INPUT=1
capabilities/ev raw kernel attribute: 21
capabilities/ev decoded bit map:
  bit    0: 00000021
capabilities/abs raw kernel attribute: 0
capabilities/abs decoded bit map:
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 0
capabilities/key decoded bit map:
properties raw kernel attribute: 0
properties decoded bit map:
test_key: no EV_KEY capability
Unload module index
Unloaded link configuration context.

** Affects: canonical-devices-system-image
     Importance: Undecided
         Status: Confirmed

** Affects: mir
     Importance: Undecided
         Status: Invalid

** Affects: udev
     Importance: Undecided
     Assignee: Andreas Pokorny (andreas-pokorny)
         Status: Confirmed

** Affects: systemd (Ubuntu)
     Importance: Medium
         Status: Fix Committed


** Tags: input regression
-- 
[regression] Touchscreen stop working on LG L90 Dual
https://bugs.launchpad.net/bugs/1530384
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