我正在将Qt应用程序部署到运行Stretch的beaglebone black。我正在尝试将linuxfb与libinput一起使用来处理触摸事件。触摸屏输入被反转，因此我使用.conf文件设置了坐标转换矩阵。触摸在桌面上可以正常使用，但是在我的Qt应用中仍然没有显示。
这是我对Qt的环境设置：
QT_LOGGING_RULES=*=true
QT_QPA_EGLFS_HEIGHT=600
QT_QPA_EGLFS_PHYSICAL_HEIGHT=92
QT_QPA_EGLFS_PHYSICAL_WIDTH=155
QT_QPA_EGLFS_WIDTH=1024
QT_QPA_FB_DRM=1
QT_QPA_PLATFORM=linuxfb
使用上述设置，该应用程序可以正确渲染并响应，但触摸输入被反转。
这是使用以下参数运行时的Qt控制台输出：
11:24:44: Checking available ports...
11:24:44: Found 101 free ports.
11:24:44: Starting /usr/bin/gdbserver...
11:24:44: Debugging starts
Listening on port 10000
Remote debugging from host 192.168.13.104
Process /home/debian/test created; pid = 1473
qt.qpa.eglfs.kms: Using backend-provided DRM device /dev/dri/card0
qt.qpa.fb: DRM device /dev/dri/card0 opened
qt.qpa.eglfs.kms: Found 1 planes
qt.qpa.eglfs.kms: plane 0: id = 18 countFormats = 2 possibleCrtcs = 0x1 supported formats = XR24 AR24
qt.qpa.eglfs.kms: property 0: id = 5 name = 'type'
qt.qpa.eglfs.kms: type is ENUM, value is 1, possible values are:
qt.qpa.eglfs.kms: enum 0: Overlay - 0
qt.qpa.eglfs.kms: enum 1: Primary - 1
qt.qpa.eglfs.kms: enum 2: Cursor - 2
qt.qpa.eglfs.kms: "LVDS1" mode count: 1 crtc index: 0 crtc id: 19
qt.qpa.eglfs.kms: mode 0 1024 x 600 @ 45 hz
qt.qpa.eglfs.kms: Selected mode 0 : 1024 x 600 @ 45 hz for output "LVDS1"
qt.qpa.eglfs.kms: Physical size is QSizeF(155, 92) mm for output "LVDS1"
qt.qpa.eglfs.kms: Output LVDS1 can use 1 planes: 18
qt.qpa.fb: Got a new output: LVDS1
qt.qpa.eglfs.kms: Sorted screen list: QVector()
qt.qpa.fb: Got a dumb buffer for size 1024x600 and bpp 32: handle 1, pitch 4096, size 2457600
qt.qpa.fb: FB is 25 (DRM format 0x34325258), mapped at 0xb364d000
qt.qpa.fb: Got a dumb buffer for size 1024x600 and bpp 32: handle 2, pitch 4096, size 2457600
qt.qpa.fb: FB is 26 (DRM format 0x34325258), mapped at 0xb33f5000
qt.qpa.fb: QRect(0,0 1024x600) QSizeF(155, 92) 24 4
qt.qpa.input: libinput: input device 'gpio_keys', /dev/input/event2 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'gpio_keys', /dev/input/event2 is a keyboard
qt.qpa.input: libinput: input device 'tps65217_pwr_but', /dev/input/event0 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'tps65217_pwr_but', /dev/input/event0 is a keyboard
qt.qpa.input: libinput: input device 'DELL Dell USB Entry Keyboard', /dev/input/event3 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'DELL Dell USB Entry Keyboard', /dev/input/event3 is a keyboard
qt.qpa.input: libinput: input device 'SIGMACHIP Usb Mouse', /dev/input/event4 is tagged by udev as: Mouse
qt.qpa.input: libinput: input device 'SIGMACHIP Usb Mouse', /dev/input/event4 is a pointer caps
qt.qpa.input: libinput: input device 'EP0790M09', /dev/input/event1 is tagged by udev as: Touchscreen
qt.qpa.input: libinput: input device 'EP0790M09', /dev/input/event1 is a touch device
qt.qpa.input: Using xkbcommon for key mapping
我还尝试了以下环境设置：
DISPLAY=:0
QT_LOGGING_RULES=*=true
QT_QPA_EGLFS_HEIGHT=600
QT_QPA_EGLFS_INTEGRATION=eglfs_x11
QT_QPA_EGLFS_PHYSICAL_HEIGHT=92
QT_QPA_EGLFS_PHYSICAL_WIDTH=155
QT_QPA_EGLFS_WIDTH=1024
XAUTHORITY=/home/debian/.Xauthority
使用此配置，仅当beaglebone运行了裸露的xsession时，我才能运行该应用程序。该应用程序可以正确渲染，但是很滞后，触摸效果仍然不佳。
以下是此配置的Qt控制台输出：
11:26:52: Checking available ports...
11:26:52: Found 101 free ports.
11:26:52: Starting /usr/bin/gdbserver...
11:26:52: Debugging starts
Listening on port 10001
Remote debugging from host 192.168.13.104
Process /home/debian/test created; pid = 1893
qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_emu", "eglfs_kms_egldevice", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: EGL device integration plugin keys (sorted): ("eglfs_x11", "eglfs_emu", "eglfs_kms_egldevice", "eglfs_kms")
qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_x11"
qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_x11"
libEGL warning: DRI2: failed to authenticate
qt.qpa.input: libinput: input device 'gpio_keys', /dev/input/event2 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'gpio_keys', /dev/input/event2 is a keyboard
qt.qpa.input: libinput: input device 'tps65217_pwr_but', /dev/input/event0 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'tps65217_pwr_but', /dev/input/event0 is a keyboard
qt.qpa.input: libinput: input device 'DELL Dell USB Entry Keyboard', /dev/input/event3 is tagged by udev as: Keyboard
qt.qpa.input: libinput: input device 'DELL Dell USB Entry Keyboard', /dev/input/event3 is a keyboard
qt.qpa.input: libinput: input device 'SIGMACHIP Usb Mouse', /dev/input/event4 is tagged by udev as: Mouse
qt.qpa.input: libinput: input device 'SIGMACHIP Usb Mouse', /dev/input/event4 is a pointer caps
qt.qpa.input: libinput: input device 'EP0790M09', /dev/input/event1 is tagged by udev as: Touchscreen
qt.qpa.input: libinput: input device 'EP0790M09', /dev/input/event1 is a touch device
qt.qpa.input: Using xkbcommon for key mapping
Running on a software rasterizer (LLVMpipe), expect limited performance.
qt.opengl.diskcache: GL_ARB_get_program_binary support = 1
qt.opengl.diskcache: Supported binary format count = 0
qt.opengl.diskcache: Shader cache supported = 0
这是我的.conf应用于触摸屏：
Section "InputClass"
Identifier "calibration"
MatchProduct "EP0790M09"
MatchDevicePath "/dev/input/event*"
Driver "libinput"
Option "TransformationMatrix" "-1.0 0.0 1.0 0.0 -1.0 1.0 0.0 0.0 1.0"
EndSection
以下是xinput列出的设备属性：
Device 'EP0790M09':
Device Enabled (115): 1
Coordinate Transformation Matrix (116): -1.000000, 0.000000, 1.000000, 0.000000, -1.000000, 1.000000, 0.000000, 0.000000, 1.000000
libinput Calibration Matrix (270): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Calibration Matrix Default (271): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Send Events Modes Available (272): 1, 0
libinput Send Events Mode Enabled (273): 0, 0
libinput Send Events Mode Enabled Default (274): 0, 0
Device Node (236): "/dev/input/event1"
Device Product ID (235): 0, 0
版本信息：
$lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.5 (stretch)
Release: 9.5
Codename: stretch
$ uname -a
Linux beaglebone 4.4.9 #2 SMP Thu Mar 22 13:59:11 CDT 2018 armv7l GNU/Linux
如何在qt应用程序内反转触摸输入？
答案 0 :(得分：1)
解决方案最终是在我的应用中使用evdev touch并使用QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS来修复输入事件。
我的最终运行环境最终是：
QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event1:rotate=180
QT_QPA_FB_NO_LIBINPUT=1
QT_QPA_PLATFORM=linuxfb