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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - r600: linux 3.11RC isn't booting with radeon.dpm=1 option in grub"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=66963#c11">Comment # 11</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - r600: linux 3.11RC isn't booting with radeon.dpm=1 option in grub"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=66963">bug 66963</a>
              from <span class="vcard"><a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
        <pre>(In reply to <a href="show_bug.cgi?id=66963#c10">comment #10</a>)
<span class="quote">> Tried last 4 patches from Alex. Didn't work for me. The issue remains.</span >

Does disabling mclk switching help?

comment out:

        r600_enable_mclk_control(rdev, true);

in r600_start_dpm()</pre>
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