General clipboard issue on cygwin (mintty, putclip, getclip, /dev/clipboard)

[Andrey Repin]

Greetings, Shun!

> Unfortunately cygwin 3.6.10-1 caused a regression on Windows 10 IoT LTSC
> 21H2 (OS Build 19044.7663), and I think the problematic commit is 
> 7fd670a (Cygwin: clipboard: Add workaround for 
> ERROR_CLIPBOARD_NOT_OPEN), related to this thread.

> echo AAAA > /dev/clipboard no longer works, it only empties the 
> clipboard without writing anything in it.

Happened to me on regular Windows 10; thankfully, putclip works fine.

> Only Windows 10 IoT LTSC 21H2 is affected. Windows 11 25H2 (OS Build 
> 26200.8655) is fine.


-- 
With best regards,
Andrey Repin
Sunday, September 20, 2026 13:53:57

Sorry for my terrible english...