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Help: Right alt is detecting as ISO_Level3_Shift. Fedora KDE (lemmy.dbzer0.com)
submitted 9 hours ago by mexicancartel@lemmy.dbzer0.com to c/linux@lemmy.ml
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The xev output for both left alt and right alt is given below. I could not use right alt for any purpose due to this. What could be the problem? Thanks in advance.

KeyPress event, serial 39, synthetic NO, window 0x1400001,
    root 0x409, subw 0x0, time 14963499, (139,64), root:(818,407),
    state 0x10, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 39, synthetic NO, window 0x1400001,
    root 0x409, subw 0x0, time 14964219, (139,64), root:(818,407),
    state 0x18, keycode 108 (keysym 0xfe03, ISO_Level3_Shift), same_screen YES,
    XKeysymToKeycode returns keycode: 92
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False
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[-] 2xsaiko@discuss.tchncs.de 1 points 2 hours ago

Yes, it depends on the layout. For example, I use the “English (Macintosh)” variant of the US layout. It has bindings for level 3 shift on all keys pretty much.

[-] mexicancartel@lemmy.dbzer0.com 1 points 2 hours ago

I also now set it to macintosh variant. But can I assign it to right shift instead of alt? I need the alt but there seems to be no option for using shift

[-] megane_kun@lemmy.dbzer0.com 1 points 9 minutes ago

As far as I understand those selectors work, using shift as the level 3 modifier is a bad idea since ....

level combination
1 key
2 SHIFT + key
3 L3 + key
4 SHIFT + L3 + key
5 L5 + key
6 L5 + SHIFT + key

I suppose customizing the keyboard layout such that SHIFT can be used as L3 modifier can be done. Otherwise, you might want to refer to /usr/share/X11/xkb/rules/evdev.lst.

Here's the relevant part(s):

option group:option description
lv2 Key to choose the 2nd level
lv2:lsgt_switch The "< >" key
lv3 Key to choose the 3rd level
lv3:switch Right Ctrl
lv3:menu_switch Menu
lv3:win_switch Any Win
lv3:lwin_switch Left Win
lv3:rwin_switch Right Win
lv3:alt_switch Any Alt
lv3:lalt_switch Left Alt
lv3:ralt_switch Right Alt
lv3:ralt_switch_multikey Right Alt; Shift+Right Alt as Compose
lv3:ralt_alt Right Alt never chooses 3rd level
lv3:enter_switch Enter on keypad
lv3:caps_switch Caps Lock
lv3:caps_switch_capslock_with_ctrl Caps Lock; Ctrl+Caps Lock for original Caps Lock action
lv3:bksl_switch Backslash
lv3:lsgt_switch The "< >" key
lv3:caps_switch_latch Caps Lock; acts as onetime lock when pressed together with another 3rd-level chooser
lv3:bksl_switch_latch Backslash; acts as onetime lock when pressed together with another 3rd level chooser
lv3:lsgt_switch_latch The "< >" key; acts as onetime lock when pressed together with another 3rd level chooser
lv5 Key to choose the 5th level
lv5:caps_switch Caps Lock chooses 5th level
lv5:lsgt_switch The "< >" key chooses 5th level
lv5:ralt_switch Right Alt chooses 5th level
lv5:menu_switch Menu chooses 5th level
lv5:rctrl_switch Right Ctrl chooses 5th level
lv5:lsgt_switch_lock The "< >" key chooses 5th level and acts as a one-time lock if pressed with another 5th level chooser
lv5:ralt_switch_lock Right Alt chooses 5th level and acts as a one-time lock if pressed with another 5th level chooser
lv5:lwin_switch_lock Left Win chooses 5th level and acts as a one-time lock if pressed with another 5th level chooser
lv5:rwin_switch_lock Right Win chooses 5th level and acts as a one-time lock if pressed with another 5th level chooser
[-] 2xsaiko@discuss.tchncs.de 2 points 2 hours ago

It doesn't seem to be available as part of the standard modifiers. You can probably have it as part of a custom layout, but I have no idea about how to do that.

this post was submitted on 24 Nov 2024
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