[Bug 69301] no screen on update from 3.12.0

https://bugzilla.kernel.org/show_bug.cgi?id=69301

--- Comment #9 from Jan Outhuis jouthuis@dds.nl --- Moved on to 3.13.1. This time radeon.dpm=0 solves the problem, i.e. I'm getting full functionality on all screens, textconsole as well as graphic console. Without radeon.dpm=0 on the grub commandline: still same behaviour on boot, i.e. black screen, hardware reboot required.

On Thu, 2014-01-23 at 14:44 +0000, bugzilla-daemon@bugzilla.kernel.org wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=69301

        Bug ID: 69301
       Summary: no screen on update from 3.12.0
       Product: Drivers
       Version: 2.5
Kernel Version: 3.13.0
      Hardware: x86-64
            OS: Linux
          Tree: Mainline
        Status: NEW
      Severity: normal
      Priority: P1
     Component: Video(DRI - non Intel)
      Assignee: drivers_video-dri@kernel-bugs.osdl.org
      Reporter: jouthuis@dds.nl
    Regression: No

3.13.0 hangs on video initialisation for my Radeon HD7750 card. It worked on 3.12.0 and previous on 3.11.4.

After upgrading to 3.13.0, the bootprocess doesn't get past the video-initialisation and leaves me with a black screen and dead keyboard.

I'm running Debian testing on 64bit architecture.