Re: Grub hangs if no key is pressed

[Randy Goldenberg]

You mention that grub makes use of your laptop's native resolution, 1920x1080.  
Have you confirmed that that resolution is supported by the VESA BIOS video 
driver?  To do so, get a grub command prompt by typing "c" at the grub menu 
display, then type:

set pager=1
vbeinfo  

HTH,

Randy

On Friday December 29, 2017, Jürgen Bausa wrote: 

> Using
>
>         GRUB_GFXMODE=1920x1080
>
> I have the same behaviour as without the option: grub is slow and hangs after
> "loading initial ramdisk" if no key is pressed.
>
> In the meantime I found out that grub sometimes (not often, maybe 1 of 10)
> hangs with 1280x1024. I am now using 1024x768, which seems to work reliable.
>
> My system uses legacy mode, not uefi. I dont know if this is related.
>
> Juergen
>
> > Did you try with GRUB_GFXMODE=1920x1080 ?
> >
> > Am Donnerstag, 28. Dezember 2017, 20:06:41 CET schrieben Sie:
> > > 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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