我在 Debian 10 上使用 Xfce 4.12，在 macOS Catalina 上运行的 Oracle VirtualBox 6.1 中运行。
我的所有按键映射在 macOS 上都设置为默认值。 （系统偏好设置 > 键盘 > 修饰键 > 恢复默认值 > 确定。）
转义上限效果很好
在 Debian VM 中，我运行：
$ setxkbmap -option
$ setxkbmap -query
rules: evdev
model: pc105
layout: us
$ setxkbmap -option caps:escape
$ setxkbmap -query
rules: evdev
model: pc105
layout: us
options: caps:escape
现在，大写锁定的行为类似于 Debian VM 中的转义，而大写锁定的行为类似于 macOS 系统上的大写锁定。这按预期工作。
这是xev我按下大写锁定键后的输出setxkbmap -option：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 128721870, (-31,207), root:(560,530),
state 0x0, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 128721874, (-31,207), root:(560,530),
state 0x2, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
这是xev我按下大写锁定键后的输出setxkbmap -option caps:escape：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 128844487, (163,5), root:(754,328),
state 0x0, keycode 66 (keysym 0xff1b, Escape), same_screen YES,
XKeysymToKeycode returns keycode: 9
XLookupString gives 1 bytes: (1b) "
mbLookupString gives 1 bytes: (1b) "
FilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 128844489, (163,5), root:(754,328),
state 0x0, keycode 66 (keysym 0xff1b, Escape), same_screen YES,
XKeysymToKeycode returns keycode: 9
XLookupString gives 1 bytes: (1b) "
FilterEvent returns: False
控制上限不起作用
在 Debian VM 中，我运行：
$ setxkbmap -option
$ setxkbmap -query
rules: evdev
model: pc105
layout: us
$ setxkbmap -option ctrl:nocaps
$ setxkbmap -query
rules: evdev
model: pc105
layout: us
options: ctrl:nocaps
现在 Caps Lock 的行为与 Debian VM 中的 Ctrl 修饰符不同。
这是xev我按下大写锁定键后的输出setxkbmap -option：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 129089370, (163,1), root:(754,324),
state 0x0, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 129089373, (163,1), root:(754,324),
state 0x2, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
这是xev我按下大写锁定键后的输出setxkbmap -option ctrl:nocaps：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 129117033, (163,5), root:(754,328),
state 0x2, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
XKeysymToKeycode returns keycode: 37
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 129117037, (163,5), root:(754,328),
state 0x6, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
XKeysymToKeycode returns keycode: 37
XLookupString gives 0 bytes:
XFilterEvent returns: False
什么地方出了错？
关于这个问题的更多 xev 输出。
如果您按照下面的评论部分进行操作，您会发现到目前为止我已经确定，在运行后setxkbmap -option ctrl:nocaps，caps lock+c键入字母c，但ctrl+c的行为正确（例如：取消 bash 中的当前命令）。
ctrl这是+的 xev 输出c：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176921083, (165,3), root:(756,326),
state 0x0, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176921220, (165,3), root:(756,326),
state 0x4, keycode 54 (keysym 0x63, c), same_screen YES,
XLookupString gives 1 bytes: (03) ""
XmbLookupString gives 1 bytes: (03) ""
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176921334, (165,3), root:(756,326),
state 0x4, keycode 54 (keysym 0x63, c), same_screen YES,
XLookupString gives 1 bytes: (03) ""
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176921336, (165,3), root:(756,326),
state 0x4, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
caps lock这是+的输出c：
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176819139, (165,5), root:(756,328),
state 0x0, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
XKeysymToKeycode returns keycode: 37
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176819141, (165,5), root:(756,328),
state 0x4, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
XKeysymToKeycode returns keycode: 37
XLookupString gives 0 bytes:
XFilterEvent returns: False
KeyPress event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176819251, (165,5), root:(756,328),
state 0x0, keycode 54 (keysym 0x63, c), same_screen YES,
XLookupString gives 1 bytes: (63) "c"
XmbLookupString gives 1 bytes: (63) "c"
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x3c00001,
root 0x3ac, subw 0x0, time 176819371, (165,5), root:(756,328),
state 0x0, keycode 54 (keysym 0x63, c), same_screen YES,
XLookupString gives 1 bytes: (63) "c"
XFilterEvent returns: False
这里的问题似乎是原始的ctrl+c按正确的顺序发送正确的按键事件：
- ctrl按
- c按
- c发布
- ctrl发布）
但是caps lock+c组合以错误的顺序发送关键事件：
- ctrl按
- ctrl发布
- c按
- c发布
我怎样才能解决这个问题？