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[luke <lukefromdc@xxxxxxxxxxxx>]

This is confirmed also resolved for the Radeon HD 5570 as of last night
(March 8, 2014) by  update to linux-firmware_1.126

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https://bugs.launchpad.net/bugs/1288040

Title:
  Radeon dpm causes failure to modeset with Linux 3.14 and r600

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Using the "daily" mainline PPA versions of Linux, from
  http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current ,  both
  linux-image-3.14.0-999-generic_3.14.0-999.201403040405_amd64.deb
  (linux 3.14-rc5-43-g0c0bd34) and the earlier linux 3.14-rc1 fail to
  modeset with both the Radeon 5770 and the Radeon 6750 graphics cards.
  In most cases the card simply shuts off at the attempt to modeset
  unless booted with kernel paramenter radeon.dpm=0 to disable dynamic
  GPU power management.  At least once the 5770 gave a text mode after a
  considerable delay, and the boot messages indicated that Plymouth had
  crashed, which also crashed my script for unlocking the encrypted boot
  volume.

  Not sure if this is the right place to report this given it is a PPA,
  if not, where would be the correct place?

  I cannot send the lspiv-vnvn.log to a public forum because the
  publication of exact hardware information could benefit adversaries
  seeking to attack my encrypted computers by means of firmware-based
  attacks. I can report that both computers use AMD processors (Phenom
  II x4 and FX-8120), one a Radeon HD5770, the other a Radeon 6750.

  Here is the version.log for the offending kernel, however.

  Linux version 3.14.0-999-generic (apw@gomeisa) (gcc version 4.6.3
  (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201403040405 SMP Tue Mar 4 09:06:13
  UTC 2014

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