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    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [bisected] Black screen on boot with Radeon HD 6670"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=59614">59614</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[bisected] Black screen on boot with Radeon HD 6670
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>markus.ka.rinne@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86 (IA32)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Radeon
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>At boot, the screen goes blank.  This happens at the moment when the screen
would normally change from VGA text console to framebuffer text console.  I
can't make an ssh connection to the box after screen goes blank.

Motherboard: MSI K9AGM3
Video card: Radeon HD 6670

lspci -vvv gives: 

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks
[Radeon HD 6670] (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 03e0
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 43
        Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at fe9e0000 (64-bit, non-prefetchable) [size=128K]
        Region 4: I/O ports at c000 [size=256]
        Expansion ROM at fe9c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon

I bisected this.  The first bad commit is:
0ecebb9e0d14e9948e0b1529883a776758117d6f drm/radeon: switch to a finer grained
reset for evergreen

Reverting this commit on top of v3.8-rc4 results in a working system.</pre>
        </div>
      </p>
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