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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - DP MST with WD15 Dock leads to inconsistent port number"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112136">bug 112136</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;">Status</td>
<td>NEW
</td>
<td>NEEDINFO
</td>
</tr>
<tr>
<td style="text-align:right;">Whiteboard</td>
<td>
</td>
<td>Triaged
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>stanislav.lisovskiy@intel.com
</td>
</tr>
<tr>
<td style="text-align:right;">i915 platform</td>
<td>
</td>
<td>CFL
</td>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>display/DP MST
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - DP MST with WD15 Dock leads to inconsistent port number"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112136#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - DP MST with WD15 Dock leads to inconsistent port number"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112136">bug 112136</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to p.pawit from <a href="show_bug.cgi?id=112136#c0">comment #0</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=145815" name="attach_145815" title="dmesg with "drm.debug=0x1e log_buf_len=1M"">attachment 145815</a> <a href="attachment.cgi?id=145815&action=edit" title="dmesg with "drm.debug=0x1e log_buf_len=1M"">[details]</a></span>
> dmesg with "drm.debug=0x1e log_buf_len=1M"
>
> I am using a Dell Latitude 5491 with the WD15 dockr over USB type-C. The
> Dock is a DP MST Dock which 3 ports: HDMI, mDP and VGA. I am using HDMI and
> mDP. The displays work correctly, however, when I unplug and replug the
> displays, they get new names leading them to reset to the default display
> configuration until I also configure displays with that name.
>
> Tested to be broken on 5.3.7 as well as 5.4-rc4.
>
> Attached dmesg and xrandr.
>
> 1) Booted up while connected to Dock. Displays show up as DP-2-1 (DP-4 in
> the kernel) and DP-5. DP-6 also shows up but is disconnected (this is
> probably the VGA work). The output of xrandr is in xrandr_before_verbose.txt
> 2) Detached dock from system. (See "XXXXXXXXXXXXXX unplug" in dmesg)
> 3) Replug dock to system. (See "XXXXXXXXXXXXXX replug" in demsg)
> 4) DP-2-1 and DP-5 show as disconnected. Monitors show as DP-6 and DP-7
> instead. DP-8 also shows up disconnected.
> 5) End of log (See "XXXXXXXXXXXXXX done" in dmesg)
>
> Expected behavior: Two monitors show up as DP-2-1 and DP-2-2 and remain that
> way consistently.
>
> The first time I unplug/replug after boot, this happens without fail.
> However, the later times sometimes the display port name changes sometimes
> it doesn't.
>
> Linux Distribution: Mint 19.2</span >
Can you please verify the issue with drmtip
(<a href="https://cgit.freedesktop.org/drm-tip">https://cgit.freedesktop.org/drm-tip</a>) with kernel parameters drm.debug=0x1e
log_buf_len=4M. If the problem persists attach the full dmesg from boot.
Also, cc'ing Stan.</pre>
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