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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Dock with builtin DP/VGA "dongle" fails cycling through modes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87319#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Dock with builtin DP/VGA "dongle" fails cycling through modes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87319">bug 87319</a>
from <span class="vcard"><a class="email" href="mailto:chih.ho@canonical.com" title="Chih-Hsyuan Ho <chih.ho@canonical.com>"> <span class="fn">Chih-Hsyuan Ho</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=110893" name="attach_110893" title="drm debug messages while doing hot-plugging with the VGA port in the docking station">attachment 110893</a> <a href="attachment.cgi?id=110893&action=edit" title="drm debug messages while doing hot-plugging with the VGA port in the docking station">[details]</a></span>
drm debug messages while doing hot-plugging with the VGA port in the docking
station
On the VGA port on the Dock, there is no hotplug event after the DP-2 port
output state is set to NOCRTC.
Investigation:
After we compare the drm debug message of the VGA ports (the VGA port on the
machine and on the dock).
1. The VGA port on the machine:
After we turn off the DP-2 (output state was set to NOCRTC.), the drm
driver receives the hot plug event from DP-2 port.
The drm driver will probe the port.
At 2032.729660 second in the dmesg_vga_port_on_the_machine.log in the
attached compressed file, DP-2 output state is set to NOCRTC.
At 2032.755454 second, drm driver receive a hot-plug event.
2. The VGA port on the dock:
After we turn off the DP-2 (output state was set to NOCRTC.), there is no
the hot plug event from DP-2 port.
At 1721.038377 second in the dmesg_vga_port_on_the_dock.log in the
attached compressed file, DP-2 output state is set to NOCRTC.
After that, there is no hot plug event.</pre>
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