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It turned out the problem was enabling "Locate Pointer" under "Universal Access" in GNOME settings. (This highlights the mouse pointer when you press and release the left Control key.) Apparently, while it interoperates correctly with other applications, it doesn't play nice with the NICE DCV client. DCV developers might want to look into this.
Technical information: I diagnosed this using xev
; it was reporting a different, more cryptic message for left control than for right control.
Right control:
KeyPress event, serial 37, synthetic NO, window 0x4400001,
root 0x9f3, subw 0x0, time 71454338, (89,89), root:(2416,2117),
state 0x0, keycode 105 (keysym 0xffe4, Control_R), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 37, synthetic NO, window 0x4400001,
root 0x9f3, subw 0x0, time 71454914, (89,89), root:(2416,2117),
state 0x4, keycode 105 (keysym 0xffe4, Control_R), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
Left control:
KeymapNotify event, serial 37, synthetic NO, window 0x0,
keys: 4294967283 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
已回答 6 個月前
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