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[Federico Tello Gentile <1386973@xxxxxxxxxxxxxxxxxx>]

I can confirm the bug is fixed on today's Vivid daily image. I was able
to boot and play in the live session. I verified the radeon driver with
kernel mode setting was in use.

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https://bugs.launchpad.net/bugs/1386973

Title:
  Ubuntu 14.10 soft lockup with ATI Radeon R7 250 X

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Confirmed
Status in linux source package in Utopic:
  Confirmed
Status in linux source package in Vivid:
  Fix Released

Bug description:
  I have a VGA controller Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X].
  When I boot from the Utopic DVD I get to the language menu and I can select try ubuntu without installing, but after a few sencods I get "BUG: soft lockup - CPU#0 stuck for 22s!'" and the message just repeats every 22 secods forever.

  I tried setting nomodeset using the F6 menu, but I got exactly the
  same result.

  This is Ubuntu 14.10 64 bits which basically seems unable to boot with
  that hardware.

  The experience was the same with 14.04, but I thought 14.10 would be
  better. In 14.04 disabling the video card and booting off the
  integrated graphics let me set nomodeset in /etc/default/grub and I
  was able boot with the R7 250X with the VESA driver. Installed
  Catalyst afterwards.

  
  ===
  break-fix: - 16b036af31e1456cb69243a5a0c9ef801ecd1f17

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