<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [SKL Xeon DP-to-VGA] no hotplug signal from DP-to-VGA branch device after unplug/replug cycle" href="https://bugs.freedesktop.org/show_bug.cgi?id=101044#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [SKL Xeon DP-to-VGA] no hotplug signal from DP-to-VGA branch device after unplug/replug cycle" href="https://bugs.freedesktop.org/show_bug.cgi?id=101044">bug 101044</a> from <a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> Ville Syrjala</a> <pre>Long ago I came up with this to fix my dongle: <a href="https://lists.freedesktop.org/archives/intel-gfx/2015-July/070788.html">https://lists.freedesktop.org/archives/intel-gfx/2015-July/070788.html</a> I'll have to re-test to see if my dongle still needs that or not. Also there's a BRANCH_DEVICE_CTRL register in DPCD which supposedly allows you to select whether short or long pulses are used for HPD notifications. It should default to long pulse, but at least my dongle used to do short pulses by default back when I came up with that patch. I don't think I ever tried to play around with BRANCH_DEVICE_CTRL on my dongle to see if it made any difference. I should do that as well.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>