On Tue, Jan 21, 2014 at 12:26:52AM +0100, Jens Taprogge wrote:

Hello,

I have bisected the boot failure of a Lenovo Thinkpad X1 Carbon to the
merge ea4ebd1cb093c8ec5d7f4bf9070dc444184c3971.  What I call "boot
failure" refers to the fact that no console is shown, the machine only
reads from the disc for a very short time, and the machine does not
respond to Ctrl-Alt-Del, etc.

As it turns out reverting e696c68363740d3a8fe495e353de3ff26b86257a
(Input: serio - fix sysfs layout) on top of v3.13 makes the machine boot
again.  So far I have now clue how this commit can affect early boot
/ showing of the console.

Does it ring any bells for you?

No, not at all, I don't see how that patch could prevent booting,
especially as it is fixing a regression (i.e. putting things back the
way they originally were.)

very odd.

greg k-h