[bug #36740] FTDI USB Serial Device not recognized and "insmod ehci" freezes grub

[Ales Nesrsta]

Follow-up Comment #6, bug #36740 (project grub):

Hm, it was bad idea - You have really USB 2.0 version of serial converter.

So, from my point of view there are these possible reasons:

1.
Your serial converter is not fully compatible with GRUB USB serial driver
which is related to Prolific PL2303.
It might be pssible because Your converter has little bit another
configuration of endpoints (e.g. there is missing interrupt endpoint according
to my device).
But I don't expect it too much.

2.
You are using ATEN KVM switch instead of "normal" keyboard, mouse and monitor.
KVM switch is some compound USB device possibly not compatible with GRUB yet -
it could be the reason why GRUB freezes when EHCI driver is loaded.

Could You try boot GRUB without ATEN KVM switch?
I.e., try to start PC in this way: Connect to PC only "normal" USB keyboard
and some monitor, nothing else.
Does it help?

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