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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [hsw] MST configuration not enabled automatically on boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87917">bug 87917</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<td style="text-align:right;">Component</td>
<td>Driver/intel
</td>
<td>DRM/Intel
</td>
</tr>
<tr>
<td style="text-align:right;">Assignee</td>
<td>chris@chris-wilson.co.uk
</td>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<td style="text-align:right;">Product</td>
<td>xorg
</td>
<td>DRI
</td>
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<td style="text-align:right;">Summary</td>
<td>MST not being enabled on Haswell host
</td>
<td>[hsw] MST configuration not enabled automatically on boot
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [hsw] MST configuration not enabled automatically on boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87917#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [hsw] MST configuration not enabled automatically on boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87917">bug 87917</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to Steven Noonan from <a href="show_bug.cgi?id=87917#c0">comment #0</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=111587" name="attach_111587" title="dmesg 3.18.1, unhappy MST">attachment 111587</a> <a href="attachment.cgi?id=111587&action=edit" title="dmesg 3.18.1, unhappy MST">[details]</a></span>
> dmesg 3.18.1, unhappy MST
>
> I've got a GIGABYTE Brix Pro i7-4770R box with a Mini DisplayPort output.
> Attached to that port I have a Dell UP2414Q 4K monitor, with DisplayPort 1.2
> mode enabled. On Windows I'm able to use the native MST-backed 60Hz 4K
> resolution without issues.
>
> On Linux (3.18.1), I'm having troubles getting that to happen.
>
> First of all, X11 is starting at 1024x768 resolution, and the kernel said
> this about it:
>
> [ 2.631515] [drm] Cannot find any crtc or sizes - going 1024x768</span >
This is the crux of the issue, just that the state readback for MST is not yet
perfect and so we fail to inherit the initial state, if any.
>
<span class="quote">> Once X11 is started, I'm able to see the two halves of the display in my KDE
> monitor preferences (DP1-8 and DP1-9, where DP1-9 is the left half of the
> display). I can also set both of them to 1920x2160 and configure the
> positioning such that the two halves are treated as separate monitor outputs
> side-by-side. But ideally this should be discovered as one 3840x2160
> monitor, on a single DisplayPort output. That would also make it so that my
> X11 WM would treat it as a single desktop.</span >
So long as you appreciate that it is a single logical monitor backed by two 2
Display Ports, work is in progress to provide that level of automatic
configuration to the display managers.
<span class="quote">> I've booted my kernel with drm.debug=6, and attached it for inspection.</span ></pre>
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