Number pad issues when using nano in PuTTY

Question

I'm using PuTTY on an old Windows laptop to communicate with Ubuntu.

When using the terminal everything is fine and I can use Numpad normally. However, when I open anything in nano all these keys have functions instead of numbers.

I did a search about this and found a few solutions to change PuTTY settings but they had no effect. Is this an issue with PuTTY or with nano?

Answer 1

For anyone else with this problem- this is PuTTY specific, and is caused by the application keypad mode sending escape sequences to nano.

To Solve: From an open PuTTY terminal:

• ctlr+right click to bring up context menu
• Select "Change Settings..."
• Select Terminal -> Features in the left-hand navigation tree
• Check "Disable application keypad mode"

Ref: Description of bug on the Vim (FANDOM.com??) wiki

Answer 2

nano uses the curses keypad function, turning it on (so that curses handles cursor-keys). The terminal description turns on application mode for both the cursor-keys and the numeric keypad, which with PuTTY makes it send the non-numeric stuff.

You could modify the terminal description to remove the numeric-keypad part of the smkx capability:

infocmp -1 >foo
vi foo
... look for smkx=\E[?1h\E=,
... change that to smkx=\E[?1h,
tic foo