Some additional information and a workaround I found:
Grub is extremely slow. When I press a key, it takes more than 2 seconds
before I see the result on the screen. Another information that might be
important is that the Laptop has a high resolution (1920 x 1080) and grub
makes use of this.
The workaround I found is to either use a textual grub screen
GRUB_TERMINAL=console
GRUB_GFXPAYLOAD_LINUX=text
or to use a fixed and lower resolution like
GRUB_GFXMODE=800x600
or
GRUB_GFXMODE=1024x768
Setting either a textual screen or the fixed resolution solves the problem:
grub is more responsive and starting the default kernel via timeout works.
As this is only a workaround and grub should work without it, I am still
interested in a solution.
Regards,
Juergen
Am Mittwoch, 27. Dezember 2017, 22:22:16 CET schrieben Sie:
> I have a Xiaomi Air 12 with deiban stretch (amd64) installed. Grub
> (2.02~beta3-5) works in principle but I found out, that it hangs very often,
> if no key is pressed (timeout for selecting the boot option).
>
> In this case the default option is correctly selected. Then, the screen is
> cleared, the name of the selected kernel is displayed and the message
> "loading initial ram disk". Then the screen gets black and nothing happens
> anymore. It seems that the system is never started (nothing is written to
> the logs).
>
> If I select the default boot option by pressing <Enter> on the first grub
> screen, everything works fine and the system boots up normally.
>
> I have no idea how to debug this. Is there a debug option for grub that
> enables some output on the screen?
>
> Any other hints?
>
> Regards,
>
> Jürgen
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