** Changed in: unity-2d
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/968840
Title:
HUD gets activated by Thinkpad USB Keyboard's back and forward buttons
Status in Unity 2D:
Fix Released
Status in “unity-2d” package in Ubuntu:
New
Status in “unity-2d” source package in Precise:
New
Bug description:
Test case:
1. Download attachment foo.c
(https://bugs.launchpad.net/ubuntu/+source/unity-2d/+bug/968840/+attachment/3088438/+files/foo.c)
2. Compile the code with
g++ foo.c -o XFakeKey `pkg-config --libs --cflags x11 xtst`
3. Run ./XFakeKey Alt_L Left
-> The HUD should not appear
===
This is on Ubuntu 12.04 beta using unity-2d 5.8.0-0ubuntu1.
I use a Thinkpad USB Keyboard on my desktop, which has "back" and
"forward" buttons just above the arrow keys (as found on Thinkpad
laptops). They seem to act a bit differently to the keyboards found
on laptops though, since instead of generating their own scan codes,
they generate "Alt+Left" and "Alt+Right" key presses.
For instance, pressing the "back" button in xev results in the
following events:
KeyPress event, serial 30, synthetic NO, window 0x3a00001,
root 0x15f, subw 0x0, time 434986370, (445,143), root:(512,231),
state 0x0, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyPress event, serial 30, synthetic NO, window 0x3a00001,
root 0x15f, subw 0x0, time 434986370, (445,143), root:(512,231),
state 0x8, keycode 113 (keysym 0xff51, Left), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
And releasing the key results in:
KeyRelease event, serial 33, synthetic NO, window 0x3a00001,
root 0x15f, subw 0x0, time 434986498, (445,143), root:(512,231),
state 0x8, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 33, synthetic NO, window 0x3a00001,
root 0x15f, subw 0x0, time 434986498, (445,143), root:(512,231),
state 0x0, keycode 113 (keysym 0xff51, Left), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
If I press and release the key quick enough, this often has the effect
of bringing up the HUD as well as causing my web browser to navigate
to the previous page.
This behaviour is surprising to me: there is clearly a second key
press in the event stream between the "Alt" key press and release,
which I would have thought would be enough to inhibit the HUD from
popping up.
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