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<body><span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86377">bug 86377</a>
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<td>przanoni@gmail.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86377#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86377">bug 86377</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>Well there's nothing really indicating an error (beyond the fifo underrun) in
the 3.16 dmesg. Grabbing a new one (with drm.debug=0xe from boot until the mode
should be set) can't hurt, but probably won't help.
It really looks like the fifo underrun kills the screen, which usually means
the watermarks are bonkers. Which is expected somewhat since we haven't yet
tried 4k@60Hz, ever.</pre>
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