Pressing Print_Screen writes 7361u to the terminal

[jamessan]

Describe the bug Press Print Screen key and part (7361u) of the escape code (CSI 57361u) is written to the terminal. How much seems to depend on the shell (zsh - 7361u, bash - 361u, dash - the entire thing), however I wouldn't expect anything by default.

Output from kitty --debug-input:

Press xkb_keycode: 0x6b clean_sym: Print composed_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: PRESS mods: none text: '' state: 0 sent encoded key to child
Release xkb_keycode: 0x6b clean_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event

Environment details

kitty 0.23.1 (3d59e4eac1) created by Kovid Goyal
Linux odin 5.15.0-2-amd64 #1 SMP Debian 5.15.5-1 (2021-11-26) x86_64
Debian GNU/Linux bookworm/sid odin pts3

Running under:X11
Frozen: False
Paths:
  kitty: /home/jamessan/src/github.com/kitty/kitty/launcher/kitty
  base dir: /home/jamessan/src/github.com/kitty
  extensions dir: /home/jamessan/src/github.com/kitty/kitty
  system shell: /bin/zsh
Loaded config files:
  /etc/xdg/kitty/kitty.conf
  /home/jamessan/.config/kitty/kitty.conf

Config options different from defaults:
enable_audio_bell     False
font_size             9.0
update_check_interval 0.0
Removed mouse actions:
     b1 -2 ungrabbed mouse_handle_click selection link prompt
Colors:
    background            #151515   
    color0                #151515   
    color15               #e8e8d3   
    foreground            #e8e8d3   

Additional context Try to reproduce the problem with kitty --config NONE if you cannot then post a minimal kitty.conf that reproduces the problem. If the problem involves interaction with some other terminal program post a minimal config for that program to reproduce the problem as well.

[kovidgoyal]

This is by design. Keys not representable in the traditional terminal encoding are now sent using the new kitty keyboard protocol, even in legacy mode. See discussion in https://github.com/kovidgoyal/kitty/issues/3248

[yangyingchao]

I know this is an old thread, but I wonder if it is possible to disable this behaviour: it is somewhat annoying to see these charactors in the terminal after "PrintScreen" is pressed..

Thanks.

[kovidgoyal]

Map it to discard_event in kitty.conf

[yangyingchao]

Map it to discard_event in kitty.conf

Thanks!

[jvasile]

Just in case anybody is looking in this thread for a solution, add this to your kitty.conf:

 map print_screen discard_event

[marckleinebudde]

Doesn't work for me:

$ grep print ~/.config/kitty/kitty.conf
map print_screen discard_event

$ kitty --version
kitty 0.21.2 created by Kovid Goyal
$ kitty --debug-keyboard
[151 10:39:07.514080] Ignoring unknown config key: open_url_modifiers
[151 10:39:07.514189] Ignoring unknown config key: rectangle_select_modifiers
[151 10:39:07.514219] Ignoring unknown config key: terminal_select_modifiers
Loading new XKB keymaps
Modifier indices alt: 0x3 super: 0x6 hyper: 0xffffffff meta: 0xffffffff numlock: 0x4 shift: 0x0 capslock: 0x1
Move mouse_button: -1 mods: none grabbed: 0
Press xkb_keycode: 0x6b clean_sym: Print composed_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: PRESS mods: none text: '' state: 0 sent key to child
Release xkb_keycode: 0x6b clean_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x6b clean_sym: Print composed_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: PRESS mods: none text: '' state: 0 sent key to child
Release xkb_keycode: 0x6b clean_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x85 clean_sym: Super_L composed_sym: Super_L mods: none glfw_key: 57444 (LEFT_SUPER) xkb_key: 65515 (Super_L)
on_key_input: glfw key: 0xe064 native_code: 0xffeb action: PRESS mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
on_key_input: glfw key: 0xe064 native_code: 0xffeb action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event

For each press of Print Screen it prints 361u to the new terminal window.

[kovidgoyal]

your version of kitty is too old

[marckleinebudde]

With the latest nightly ("Nightly release, generated on: 2022-05-29 21:26:02 UTC from commit: 581c388."), same result :cry:

$ grep print ~/.config/kitty/kitty.conf                                                                      
map print_screen discard_event

$ ./local/kitty/bin/kitty --version                               
kitty 0.25.1 created by Kovid Goyal

$ ./local/kitty/bin/kitty --debug-keyboard                        
[151 15:10:48.583923] Ignoring unknown config key: open_url_modifiers
[151 15:10:48.584279] Ignoring unknown config key: rectangle_select_modifiers
[151 15:10:48.584361] Ignoring unknown config key: terminal_select_modifiers
Loading new XKB keymaps
Modifier indices alt: 0x3 super: 0x6 hyper: 0xffffffff meta: 0xffffffff numlock: 0x4 shift: 0x0 capslock: 0x1
Move x: 751.0 y: 296.0 grabbed: 0
Press xkb_keycode: 0x6b clean_sym: Print composed_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: PRESS mods: none text: '' state: 0 sent encoded key to child
Release xkb_keycode: 0x6b clean_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x6b clean_sym: Print composed_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: PRESS mods: none text: '' state: 0 sent encoded key to child
Release xkb_keycode: 0x6b clean_sym: Print mods: none glfw_key: 57361 (PRINT_SCREEN) xkb_key: 65377 (Print)
on_key_input: glfw key: 0xe011 native_code: 0xff61 action: RELEASE mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x25 clean_sym: Control_L composed_sym: Control_L mods: none glfw_key: 57442 (LEFT_CONTROL) xkb_key: 65507 (Control_L)
on_key_input: glfw key: 0xe062 native_code: 0xffe3 action: PRESS mods: none text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x36 clean_sym: c composed_sym: c mods: ctrl glfw_key: 99 (c) xkb_key: 99 (c)
on_key_input: glfw key: 0x63 native_code: 0x63 action: PRESS mods: ctrl text: '' state: 0 sent encoded key to child
Release xkb_keycode: 0x36 clean_sym: c mods: ctrl glfw_key: 99 (c) xkb_key: 99 (c)
on_key_input: glfw key: 0x63 native_code: 0x63 action: RELEASE mods: ctrl text: '' state: 0 ignoring as keyboard mode does not support encoding this event
Press xkb_keycode: 0x28 clean_sym: d composed_sym: d mods: ctrl glfw_key: 100 (d) xkb_key: 100 (d)
on_key_input: glfw key: 0x64 native_code: 0x64 action: PRESS mods: ctrl text: '' state: 0 sent encoded key to child

[kovidgoyal]

Then you arent actually mapping what you think you are mapping.

kitty --config=NONE -o 'map print_screen discard_event'

will work.

[marckleinebudde]

This works. It seems to be relevant where in the config file that line is placed. Works now. Thanks for your patience, sorry for the noise!

[marckleinebudde]

your version of kitty is too old

For the record, now it works even with: kitty 0.21.2 created by Kovid Goyal

[marckleinebudde]

For the record, there are some more events you might want to discard:

map print_screen discard_event
map ctrl+print_screen discard_event
map alt+print_screen discard_event
map super+print_screen discard_event