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I updated the Kernel to 3.13.0-34.60~precise1 and got the same freezes
at startup. I found the kernel parameters "debug ignore_loglevel
print_fatal_signals=1 LOGLEVEL=8 earlyprintk=vga,keep sched_debug" in
Archlinux Wiki [1]. When i boot with these Parameters and "console=tty
console=ttyS0,115200n8" for logging I get

[    8.853449] [drm] Memory usable by graphics device = 2048M
[    8.853452] checking generic (e0000000 500000) vs hw (e0000000 10000000)
[    8.853453] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
[    9.220645] Console: switching to colour dummy device 80x25

I googled the Error and found [2]. Disabling the framebuffer with the
parameter "video=vesafb:off" does not help. I get the same Error at
normal startups, too.

[1] https://wiki.archlinux.org/index.php/Boot_debugging#Extreme_Debug
[2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/614085/comments/1https://bugs.launchpad.net/ubuntu/+source/linux/+bug/614085/comments/1

** Attachment added: "startup.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1352358/+attachment/4180648/+files/startup.log

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https://bugs.launchpad.net/bugs/1352358

Title:
  Kernel 3.13 freezes sometimes at startup

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  We use Ubuntu 12.04 + 14.04 HWE. Sometimes the kernel freezes at
  startup. There is no kernelpanic. I can not use Systemrequest-Keys for
  restart. The only key that gives Feedback is the Numlock-Key (LED
  toggles). When i powercyle the Computer Grub has no countdown for
  booting the first Kernel. When I press Enter the Kernel starts
  normaly. I cannot find something in Syslog or somewhere else. I
  deactivated the bootparameter quiet und added the Parameter
  "console=tty0 console=ttyS0,115200n8". I connected the Computer via a
  Nullmodemcable with another computer and logged the bootprocess with
  minicom. The Logs are attached. I can not reproduce this Bug in Kernel
  linux-image-3.11.0-13-generic

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