Re: Strange USB behaviour; Grub fails to read disks when no USB keyboard is connected

[Steve]

Please specify the USB port type (USB 2 or 3) and the USB type (USB 2 or 3)
for both the USB keyboard and the drive.
Also, what is the host system chipset?


On Mon, 13 May 2019 at 15:11, Matschek <address@hidden> wrote:

> Hi Grub Folks,
>
> I am using Grub (2.02) to boot a Debian (OpenMediaVault) installed on an
> USB
> stick.
> This is working fine as long as a USB keyboard is connected. Sound stange,
> but please read on. As soon as I try to start the machine with no other USB
> devices (only the USB key) connected Grub fails after reading the config
> file and before starting the OS loader:
>
> -----
> Error: failure reading sector 0x802 from 'hd0'.
> Error: no such partition.
> Error: no such partition.
> Error: no such partition.
> Error: no such partition.
> Error: no such partition.
> Press any key to continue...
>   Failed to boot both default and fallback entries.
> Press any key to continue...
> -----
>
>
> I edited the boot options via "e" and tried several variants but with no
> luck. Grub is not able to find its own resources, even an "ls" command
> fails, like all internal commands shown with [TAB]:
>
> -----
> grub> ls
> no such partition.
> -----
>
>
> If I reboot with connected USB keyboard, everything is fine again. Reboot
> with a PS/2 keyboard - boot fails again.
> If seems grub loses the USB device access somewhere in stage2 (as far as I
> understand the config file is read in stage2, which is shown correctly)
>
> What can I do? Is there some debugging/verbose option I can set so see
> what's going wrong? Any extra option I should use for grub-install in my
> scenario?
>
> Regards,
> Matthias Philipp
>
>
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