Re: cygwin and xwin and super and hyper

[Jon TURNEY <jon.turney@dronecode.org.uk>]

On 21/06/2013 16:56, J. David Boyd wrote:
> Jon TURNEY writes:
>> On 19/06/2013 22:27, J. David Boyd wrote:
>>> I can get my capslock key to be super with the command line 'setxkbmap -option
>>> caps:super', but I can't get 'setxkbmap -option altwin:hyper_win' to do
>>> anything.
>>>
>>> Running 'setxkbmap -print' shows both options as being set, but the win keys
>>> still act as the win key.
>>>
>>> Is there something else I need to do so windows lets go of these keys?
>>
>> Yes.
>>
>> Again, let me refer you to [1].  The operative sentence is:
>>
>>> (Note that mapping the Windows keys to hyper also requires the -keyhook
>>> option, so that the X server sees those keys before the Windows shell)
>>
>> One thing I failed to mention there is that without any keymap options the
>> keymap should give you super on the windows keys, but you will still need
>> -keyhook X server option to enable the X server to see the key.
>>
>> [1] http://cygwin.com/ml/cygwin/2012-03/msg00427.html
> 
> 
> I can get everything working up to the point I start emacs.
> 
> The output from 'setxkbmap -print' is:
> 
> xkb_keymap {
>         xkb_keycodes  { include "xfree86+aliases(qwerty)"       };
>         xkb_types     { include "complete"      };
>         xkb_compat    { include "complete"      };
>         xkb_symbols   { include "pc+us+inet(pc105)+altwin(alt_super_win)+capslock(hyper)"       };
>         xkb_geometry  { include "pc(pc105)"     };
> };
> 
> and if I run XEV, and press capslock I get:
> 
> KeyPress event, serial 32, synthetic NO, window 0xc00001,
>     root 0x131, subw 0x0, time 8145997, (504,324), root:(2162,400),
>     state 0x0, keycode 66 (keysym 0xffed, Hyper_L), same_screen YES,
>     XLookupString gives 0 bytes: 
>     XmbLookupString gives 0 bytes: 
>     XFilterEvent returns: False
> 
> KeyRelease event, serial 32, synthetic NO, window 0xc00001,
>     root 0x131, subw 0x0, time 8146122, (504,324), root:(2162,400),
>     state 0x40, keycode 66 (keysym 0xffed, Hyper_L), same_screen YES,
>     XLookupString gives 0 bytes: 
>     XFilterEvent returns: False
> 
> 
> and if I press Left Windows key I get:
> 
> KeyPress event, serial 32, synthetic NO, window 0xc00001,
>     root 0x131, subw 0x0, time 8148993, (504,324), root:(2162,400),
>     state 0x0, keycode 115 (keysym 0xffeb, Super_L), same_screen YES,
>     XLookupString gives 0 bytes: 
>     XmbLookupString gives 0 bytes: 
>     XFilterEvent returns: False
> 
> KeyRelease event, serial 32, synthetic NO, window 0xc00001,
>     root 0x131, subw 0x0, time 8149102, (504,324), root:(2162,400),
>     state 0x40, keycode 115 (keysym 0xffeb, Super_L), same_screen YES,
>     XLookupString gives 0 bytes: 
>     XFilterEvent returns: False
> 
> 
> 
> All perfect so far.
> 
> So, when I start up emacs, and press C-h k, then, for example, Capslock-d,
> (hyper-d) I get 'H-d is undefined'. Yeah.
> 
> Then I press C-h k, then Left-Win-d, (super-d), I get 'H-d is undefined', and
> not 's-d is undefined', which is what I expected to see.
> 
> Any ideas how I might resolve this?

Looking at the xev output for Hyper-d and Super-d, it seems they have the same
state (modifier) value.

This is because xkeyboard-config seems to place super and hyper on the same
modifier, mod4, as can be seen looking at the output of 'xmodmap -pm'

> $ xmodmap -pm
> xmodmap:  up to 5 keys per modifier, (keycodes in parentheses):
> 
> shift       Shift_L (0x32),  Shift_R (0x3e)
> lock
> control     Control_L (0x25),  Control_R (0x6d)
> mod1        Alt_L (0x40),  Alt_R (0x74),  Meta_L (0x9c)
> mod2        Num_Lock (0x4d)
> mod3
> mod4        Hyper_L (0x42),  Super_L (0x73),  Super_R (0x75),  Super_L (0x7f),  Hyper_L (0x80)
> mod5        Mode_switch (0x8),  ISO_Level3_Shift (0x7c)

And it seems that emacs only looks at the modifier state, not the actual
proceeding keypress.

A workaround for this is to move Hyper_L to the unused mod3 modifier.

> $ xmodmap -e "remove mod4 = Hyper_L"
> 
> $ xmodmap -e "add mod3 = Hyper_L"
> 
> $ xmodmap -pm
> xmodmap:  up to 3 keys per modifier, (keycodes in parentheses):
> 
> shift       Shift_L (0x32),  Shift_R (0x3e)
> lock
> control     Control_L (0x25),  Control_R (0x6d)
> mod1        Alt_L (0x40),  Alt_R (0x74),  Meta_L (0x9c)
> mod2        Num_Lock (0x4d)
> mod3        Hyper_L (0x42),  Hyper_L (0x80)
> mod4        Super_L (0x73),  Super_R (0x75),  Super_L (0x7f)
> mod5        Mode_switch (0x8),  ISO_Level3_Shift (0x7c)

It's probably a bug that this doesn't work as expected, but I'm not sure in what.

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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