<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] replug HDMI/DP cable does not light up screen sometimes" href="https://bugs.freedesktop.org/show_bug.cgi?id=89461#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] replug HDMI/DP cable does not light up screen sometimes" href="https://bugs.freedesktop.org/show_bug.cgi?id=89461">bug 89461</a> from <a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> Ville Syrjala</a> <pre>(In reply to Jeff Zheng from <a href="show_bug.cgi?id=89461#c14">comment #14</a>) > Created <a href="attachment.cgi?id=116342" name="attach_116342" title="dmesg with i915.disable_power_well=0">attachment 116342</a> <a href="attachment.cgi?id=116342&action=edit" title="dmesg with i915.disable_power_well=0">[details]</a> > dmesg with i915.disable_power_well=0 > > This dmesg is generated with: > 1. Boot with both eDP and DP connected > 2. xinit & > 3. unplug DP > 4. Plug in DP cable, DP monitor is black screen. You have no userspace to react to the HPDs so the link remains up even if the cable gets disconnected. I suppose there are two options a) the sink went into D3, although IIRC this would be against the spec (sink is required to enter D0 on full HPD). b) the sink just doesn't feel that the link is up and running. Can't recall if there's anything in the spec about what should happen on the sink end when the cable is disconnected. So while the test scenario is a bit bogus it would be interesting to see what the sink is thinking in this case. I'll attach a debug patch for that...</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>