It's a long existing problem. Usually, when you can't use keyboard with grub, you also can't use said keyboard with UEFI\BIOS on same PC, so I don't think it's a grub bug. I've noticed that behavior mostly with modern multimedia keyboards, that have extra function keys\scroll wheel, etc. They are detected by Linux as 2 or even 3 USB devices in one, and usually first device enumerated is "multimedia" key section not the actual keyboard section. So, basically, keyboard works, just not the device with QWERTY-section of it. This is probably a bug of keyboard firmware or design, more than anything else.
On 19.11.2019 14:03, bonushenricus wrote: > Hello. > I have a problem with grub 2 debian 10 in a dual boot installation in a > DELL VENUE 11: the keyboard (usb) is not responding: I tried all the > various solutions of GRUB_TERMINAL_INPUT but nothing. > Thanks
