I'm an end user that is affected by this on my HD 4570 :(

At the moment I'm running in SOFTWARE mode because this open source
driver doesn't work for me, and ATI's binary legacy driver is
incompatible with the version of Xorg in ubuntu stable.

What can I do to help sort this out?

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https://bugs.launchpad.net/bugs/1195425

Title:
  Corrupted screen using radeon drivers

Status in Mir:
  Triaged
Status in “xserver-xorg-video-ati” package in Ubuntu:
  Triaged

Bug description:
  So, here's what I've done:

  Step 0. Aquire a Toshiba Satellite C-660 noebook with (non-switchable, 512MB) 
Radeon HD5470M graphics and intel P6200 cpu.
  Step 1. Do a fresh install using a 64bit saucy daily iso and a USB pendrive. 
  Step 2. sudo apt-get update && sudo apt-get dist-upgrade
  Step 3. Follow the guide step by step to install Mir 
http://www.olli-ries.com/running-mir/
  Step 4. sudo restart lightdm

  This produced a black screen with a blinking cursor in the top left
  corner and an X shaped mouse cursor.

  Step 5. ctrl-alt-F2, login, sudo shutdown -r now
  Steo 6. let the system reboot itself

  This produced a corrupted screen, which reacts (flickers) to mouse
  movement, with ubuntu running fine in the background.

  Step 7. ctrl-alt-F2, login, check every possible log in /var/log/
  (boot.log, dmesg, Xorg.0.log, etc..), everything looks fine and dandy,
  no apparent errors.

  At this point the following message kept spamming randomly accross all
  virtual terminals:

  [drm:radeon_cs_ib_chunk] *ERROR* Invalid command stream !

  Step 8. Write down error message
  Step 9. Reboot to recovery.
  Step 10. Report bug launchpad.
  Step 11. (optional) Revert to X using ppa-purge

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