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<body><span class="vcard"><a class="email" href="mailto:saml@supermicro.com" title="Sam <saml@supermicro.com>"> <span class="fn">Sam</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [KBL LSPCON] Linux will reboot when installing with connect HDMI monitor (include PS175 LSPCON)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105325">bug 105325</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">CC</td>
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<td>AnW@supermicro.com, saml@supermicro.com
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [KBL LSPCON] Linux will reboot when installing with connect HDMI monitor (include PS175 LSPCON)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105325#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [KBL LSPCON] Linux will reboot when installing with connect HDMI monitor (include PS175 LSPCON)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105325">bug 105325</a>
from <span class="vcard"><a class="email" href="mailto:saml@supermicro.com" title="Sam <saml@supermicro.com>"> <span class="fn">Sam</span></a>
</span></b>
<pre>Hi Elizabeth,
I found something looks not usual in the log. Check those below:
============================================================================
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID: (err -6)
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:drm_helper_hpd_irq_event
[drm_kms_helper]] [CONNECTOR:63:HDMI-A-1] status updated from unknown to
disconnected
============================================================================
DP dual mode HDMI ID: err -6 and I checked the error code in the kernel and -6
means /* No such device or address */
I tried to find the root cause and found the following logs
=============================================================================
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpc] /ENX for addr: 0050 w(1)
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpc] NAK on first message, retry
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpc] NAK for addr: 0050 w(1)
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:drm_do_probe_ddc_edid [drm]]
drm: skipping non-existent adapter i915 gmbus dpc
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpc] NAK for addr: 0040 w(1)
三 05 09:31:11 supermicro-X11SSN-E kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpc] NAK on first message, retry
============================================================================
It seems like the system keeps probing the addr 0050 and 0040 but failed to get
ack ( NAK received ) which causes the failure of HDMI connection in the end.
I am not sure why system failed to get ack. Please let me know if you may have
any thinking.
Thanks
Sam</pre>
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