我有一个Elo触摸显示器。当我通过hdmi + usb将它连接到运行android-x86（4.4）的机器时，显示器正常工作，包括显示和触摸输入。
然而，当我将它连接到运行Android 4.3的电路板（我尝试使用Udoo Quard电路板和Utilite Pro迷你电脑）时，触控部分无效。 当我触摸屏幕时，一个圆形指针显示在屏幕中间（每次都是相同的位置），然后再次消失。
连接屏幕时，“dmesg”说：
<6>usb 2-1.4: USB disconnect, device number 7
<6>usb 2-1.4: new full speed USB device number 8 using fsl-ehci
<6>input: eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface as /devices/platform/fsl-ehci.1/usb2/2-1/2-1.4/2-1.4:1.0/input/input7
<6>cpufreq_interactive_input_connect: connect to eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface
<6>generic-usb 0003:0EEF:7200.0007: input,hidraw2: USB HID v2.10 Pointer [eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface] on usb-fsl-ehci.1-1.4/input0
“getevent”说：
add device 1: /dev/input/event3
name: "eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface"
could not get driver version for /dev/input/mouse1, Not a typewriter
could not get driver version for /dev/input/mice, Not a typewriter
add device 2: /dev/input/event2
name: "TG3 Electronics, Inc. TG82tp"
could not get driver version for /dev/input/mouse0, Not a typewriter
add device 3: /dev/input/event1
name: "TG3 Electronics, Inc. TG82tp"
add device 4: /dev/input/event0
name: "gpio-keys"
如果我执行“getevent -lt / dev / input / event3”并触摸屏幕上的两个不同位置，我会得到：
[ 2910.924823] EV_ABS ABS_Z 000002de
[ 2910.924840] EV_ABS ABS_RX 000005a2
[ 2910.924846] EV_SYN SYN_REPORT 00000000
[ 2910.925760] EV_MSC MSC_SCAN 00090001
[ 2910.925763] EV_KEY BTN_LEFT DOWN
[ 2910.925777] EV_SYN SYN_REPORT 00000000
[ 2910.990739] EV_ABS ABS_Z 000002dc
[ 2910.990744] EV_ABS ABS_RX 0000059e
[ 2910.990746] EV_SYN SYN_REPORT 00000000
[ 2911.031753] EV_ABS ABS_RX 0000059c
[ 2911.031756] EV_SYN SYN_REPORT 00000000
[ 2911.032736] EV_MSC MSC_SCAN 00090001
[ 2911.032739] EV_KEY BTN_LEFT UP
[ 2911.032752] EV_SYN SYN_REPORT 00000000
[ 2913.287761] EV_ABS ABS_Z 00000c0e
[ 2913.287767] EV_ABS ABS_RX 00000800
[ 2913.287771] EV_SYN SYN_REPORT 00000000
[ 2913.288744] EV_MSC MSC_SCAN 00090001
[ 2913.288748] EV_KEY BTN_LEFT DOWN
[ 2913.288762] EV_SYN SYN_REPORT 00000000
[ 2913.306747] EV_ABS ABS_Z 00000c0c
[ 2913.306756] EV_ABS ABS_RX 00000804
[ 2913.306757] EV_SYN SYN_REPORT 00000000
[ 2913.345738] EV_ABS ABS_Z 00000c0a
[ 2913.345742] EV_ABS ABS_RX 00000808
[ 2913.345744] EV_SYN SYN_REPORT 00000000
[ 2913.399744] EV_ABS ABS_Z 00000c04
[ 2913.399749] EV_ABS ABS_RX 0000080e
[ 2913.399751] EV_SYN SYN_REPORT 00000000
[ 2913.400735] EV_MSC MSC_SCAN 00090001
[ 2913.400738] EV_KEY BTN_LEFT UP
[ 2913.400751] EV_SYN SYN_REPORT 00000000
最后一部分应证明注意到不同的立场。
在（工作）x86 Android系统上插入触摸屏的USB连接器时执行logcat会产生：
I/EventHub( 1603): New device: id=15, fd=183, path='/dev/input/event14', name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface', classes=0x14, configuration='/system/usr/idc/GenericTouch.idc', keyLayout='', keyCharacterMap='', builtinKeyboard=false, usingSuspendBlockIoctl=true, usingClockIoctl=true
E/EventHub( 1603): could not get driver version for /dev/input/mouse2, Not a typewriter
I/EventHub( 1603): New device: id=16, fd=190, path='/dev/input/event15', name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface Pe', classes=0x4, configuration='/system/usr/idc/GenericTouch.idc', keyLayout='', keyCharacterMap='', builtinKeyboard=false, usingSuspendBlockIoctl=true, usingClockIoctl=true
I/InputReader( 1603): Device reconfigured: id=16, name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface Pe', size 1920x1080, orientation 0, mode 1, display id 0
I/InputReader( 1603): Device added: id=16, name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface Pe', sources=0x00005002
I/InputReader( 1603): Device reconfigured: id=15, name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface', size 1920x1080, orientation 0, mode 1, display id 0
I/InputReader( 1603): Device added: id=15, name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface', sources=0x00001002
在（不工作的）Android 4.3系统上插入触摸屏的usb连接器时执行logcat会产生：
I/EventHub( 2552): New device: id=4, fd=191, path='/dev/input/event0', name='eGalax Inc. Elo TouchSystems Projected-Capacitive USB Touchmonitor Interface', classes=0x105, configuration='/system/usr/idc/Vendor_0eef_Product_7200.idc', keyLayout='/system/usr/keylayout/qwerty.kl', keyCharacterMap='/system/usr/keychars/qwerty2.kcm', builtinKeyboard=true, usingSuspendBlockIoctl=true, usingClockIoctl=false
W/InputReader( 2552): Ignoring spurious device added event for deviceId 0.
I/ActivityManager( 2552): Config changes=1400 {1.0 ?mcc?mnc en_US ldltr sw1080dp w1920dp h1007dp 160dpi xlrg long land finger qwerty/v/v -nav/h s.7}
D/PhoneStatusBar( 2631): mSettingsPanelGravity = 8388661
我注意到的一个区别是，在工作的Android 4.4系统上，参数
builtinKeyboard=false
但是在不起作用的Android 4.3系统上，参数
builtinKeyboard=true
android 4.3是否认为我的触摸屏是键盘，我该怎么改变它？
此致 拉斯穆斯