Hi Marcin,
I don't know exactly how that would be done in GRUB, but I'm afraid
that there's not an unique way to do this for all video card manufacturers.
Your laptop probably has a key combination to switch the video output
(usually Function key + F5), or maybe your BIOS has an option for that,
something like "iGPU Multi-Monitor".
If there's no BIOS option but they key combination works, maybe you
could get it working by using a hacky way, an usb keyboard emulator.
https://sewelldirect.com/learning-center/output-video-through-your-laptops-vga-connection
https://thehackerway.com/2017/09/05/get-back-the-low-cost-duck-now-squawks-like-an-original-usb-rubber-ducky/
Regards,
Jesus
El 7/4/19 a las 13:47, Marcin Snieg escribió:
> Dear developers,
>
> I would like a feature in Grub that instead of showing grub's menu only
> on laptop's monitor it would show grub's menu on HDMI monitor when
> laptop's lid is closed. I did not find a solution for my issue on the
> Internet. My configuration is dual boot, laptop's lid closed and
> external monitor attached through HDMI port. When I try to select which
> OS to boot I need to do it without any display.
>
> Please consider my needs,
>
> Best Regards,
>
> Marcin Snieg
>
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel
