我有一台 Dell Latitude 7200 2-in-1，这是一款可转换笔记本电脑，上面装有 Ubuntu 16.04。触摸屏被正确识别，我可以使用它来移动窗口并在终端仿真器中选择文本。
然而，在 Qt 应用程序中，触摸行为确实很奇怪：单击可以正常工作，但拖放工作就像我单击两次一样，一次在开始，一次在结束。
经过一些调查并与外部工作触摸屏（与 evdev 配合使用）进行比较，我发现通过运行 xinput test-xi2，集成触摸屏会产生常规的“鼠标事件”（ButtonPress、Motion 和 ButtonRelease）而不是触摸事件（TouchBegin、TouchUpdate 和 TouchEnd）。
我能做些什么 ？
xinput 集成触摸屏设置：
Device 'Wacom HID 48CC Finger touch':
Device Enabled (140): 1
Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (266): 0
Device Accel Constant Deceleration (267): 1.000000
Device Accel Adaptive Deceleration (268): 1.000000
Device Accel Velocity Scaling (269): 10.000000
Device Node (262): "/dev/input/event13"
Wacom Tablet Area (312): 0, 0, 10368, 6912
Wacom Rotation (313): 0
Wacom Pressurecurve (314): 0, 0, 100, 100
Wacom Serial IDs (315): 18636, 1, 3, 0, 0
Wacom Serial ID binding (316): 0
Wacom Pressure Threshold (317): 0
Wacom Sample and Suppress (318): 2, 4
Wacom Enable Touch (319): 1
Wacom Enable Touch Gesture (321): 1
Wacom Touch Gesture Parameters (322): 455, 202, 250
Wacom Tool Type (323): "TOUCH" (330)
Wacom Button Actions (324): "Wacom button action 0" (325), "Wacom button action 1" (326), "Wacom button action 2" (327)
Wacom button action 0 (325): 1572865
Wacom button action 1 (326): 1572866
Wacom button action 2 (327): 1572867
Device Product ID (261): 1386, 18636
Wacom Debug Levels (329): 0, 0
外部触摸屏，用于比较：
Device 'Weida Hi-Tech CoolTouchR System ':
Device Enabled (140): 1
Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (266): 0
Device Accel Constant Deceleration (267): 1.000000
Device Accel Adaptive Deceleration (268): 1.000000
Device Accel Velocity Scaling (269): 10.000000
Device Product ID (261): 9589, 266
Device Node (262): "/dev/input/event20"
Evdev Axis Inversion (661): 0, 0
Evdev Axis Calibration (662): <no items>
Evdev Axes Swap (663): 0
Axis Labels (664): "Abs MT Position X" (580), "Abs MT Position Y" (581), "None" (0), "None" (0)
Button Labels (665): "Button Unknown" (660), "Button Unknown" (660), "Button Unknown" (660), "Button Wheel Up" (146), "Button Wheel Down" (147)
Evdev Scrolling Distance (666): 0, 0, 0
Evdev Middle Button Emulation (667): 0
Evdev Middle Button Timeout (668): 50
Evdev Middle Button Button (669): 2
Evdev Third Button Emulation (670): 0
Evdev Third Button Emulation Timeout (671): 1000
Evdev Third Button Emulation Button (672): 3
Evdev Third Button Emulation Threshold (673): 20
Evdev Wheel Emulation (674): 0
Evdev Wheel Emulation Axes (675): 0, 0, 4, 5
Evdev Wheel Emulation Inertia (676): 10
Evdev Wheel Emulation Timeout (677): 200
Evdev Wheel Emulation Button (678): 4
Evdev Drag Lock Buttons (679): 0
集成触摸屏xinput test-xi2事件示例：
EVENT type 15 (RawButtonPress)
device: 14 (14)
detail: 1
flags:
valuators:
0: 5688.00 (5688.00)
1: 550.00 (550.00)
2: 0.00 (0.00)
3: 0.00 (0.00)
4: 0.00 (0.00)
5: 0.00 (0.00)
EVENT type 4 (ButtonPress)
device: 14 (14)
detail: 1
flags:
root: 1053.23/101.84
event: 98.23/49.84
buttons:
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 5688.00
1: 550.00
2: 0.00
3: 0.00
4: 0.00
5: 0.00
windows: root 0x194 event 0x3c00001 child 0x0
EVENT type 17 (RawMotion)
device: 14 (14)
detail: 0
flags:
valuators:
0: 5665.00 (5665.00)
1: 762.00 (762.00)
2: 0.00 (0.00)
3: 0.00 (0.00)
4: 0.00 (0.00)
5: 0.00 (0.00)
EVENT type 6 (Motion)
device: 14 (14)
detail: 0
flags:
root: 1048.97/140.09
event: 93.97/88.09
buttons: 1
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 5665.00
1: 762.00
2: 0.00
3: 0.00
4: 0.00
5: 0.00
windows: root 0x194 event 0x3c00001 child 0x3c00002
EVENT type 16 (RawButtonRelease)
device: 14 (14)
detail: 1
flags:
valuators:
EVENT type 5 (ButtonRelease)
device: 14 (14)
detail: 1
flags:
root: 1048.97/141.09
event: 93.97/89.09
buttons: 1
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
windows: root 0x194 event 0x3c00001 child 0x3c00002
工作外部触摸屏事件样本，用于比较：
EVENT type 22 (RawTouchBegin)
device: 20 (20)
detail: 121
valuators:
0: 20730.00 (20730.00)
1: 5477.00 (5477.00)
EVENT type 6 (Motion)
device: 20 (20)
detail: 0
flags: emulated
root: 1237.65/67.95
event: 1172.65/43.95
buttons:
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 20730.00
1: 5477.00
windows: root 0x194 event 0x3c00001 child 0x0
EVENT type 18 (TouchBegin)
device: 20 (20)
detail: 121
flags: emulating
root: 1214.65/213.95
event: 1149.65/189.95
buttons:
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 20730.00
1: 5477.00
windows: root 0x194 event 0x3c00001 child 0x3c00001
EVENT type 23 (RawTouchUpdate)
device: 20 (20)
detail: 119
valuators:
0: 12568.00 (12568.00)
1: 11399.00 (0.00)
EVENT type 19 (TouchUpdate)
device: 20 (20)
detail: 119
flags: emulating
root: 736.41/445.27
event: 671.41/421.27
buttons:
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 12568.00
1: 11399.00
windows: root 0x194 event 0x3c00001 child 0x3c00001
EVENT type 24 (RawTouchEnd)
device: 20 (20)
detail: 119
valuators:
0: 12568.00 (0.00)
1: 11399.00 (0.00)
EVENT type 20 (TouchEnd)
device: 20 (20)
detail: 119
flags: emulating
root: 736.41/445.27
event: 671.41/421.27
buttons:
modifiers: locked 0 latched 0 base 0 effective: 0
group: locked 0 latched 0 base 0 effective: 0
valuators:
0: 12568.00
1: 11399.00
windows: root 0x194 event 0x3c00001 child 0x3c00001
答案1
将 wacom 驱动程序从 0.34.0 升级到 0.39.0，通过构建https://github.com/linuxwacom/xf86-input-wacom解决了这个问题。