Bug#773250: linux-image-3.18.0-trunk-amd64: USB keyboard not recognized at the time cryptsetup prompt shows up

[Mike Hommey <mh@glandium.org>]

On Tue, Dec 16, 2014 at 09:22:42AM +0900, Mike Hommey wrote:
> Package: src:linux
> Version: 3.18-1~exp1
> Severity: important
> 
> Preliminary note: this works fine with linux-image-3.16.0-4-amd64 and all
> versions before that.
> 
> My setup involves a luks encrypted root file system, so I get a prompt
> during boot for the passphrase. When booting with the kernel from
> linux-image-3.18.0-trunk-amd64, I simply can't type that passphrase with
> a usb keyboard.
> 
> Note that before linux-image-3.18.0-trunk-amd64, it did work, but not
> immediately: at the time the prompt showed up, it would not actually
> work, and it would take a few seconds for the keyboard to be recognized,
> but it would eventually be useable to type the passphrase. This, in
> turn, may be related to the fact that the keyboard doesn't work in grub
> either, probably because the old bios compatibility doesn't work. If it
> did, I guess there would actually be no problem with the cryptsetup
> prompt.

So it turns out that legacy support was disabled in the bios, and that
made grub not recognize the keyboard... but that didn't solve the issue
with the cryptsetup prompt.

Mike