<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=110954#c20">Comment # 20</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=110954">bug 110954</a> from <a class="email" href="mailto:stanislav.lisovskiy@intel.com" title="Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>"> Stanislav Lisovskiy</a> <pre>(In reply to Nathan Ciobanu from <a href="show_bug.cgi?id=110954#c18">comment #18</a>) > On Wed, Aug 21, 2019 at 08:26:34AM +0000, <a href="mailto:bugzilla-daemon@freedesktop.org">bugzilla-daemon@freedesktop.org</a> > wrote: > > <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor" href="show_bug.cgi?id=110954">https://bugs.freedesktop.org/show_bug.cgi?id=110954</a> > > > > --- <a href="show_bug.cgi?id=110954#c17">Comment #17</a> from Stanislav Lisovskiy <<a href="mailto:stanislav.lisovskiy@intel.com">stanislav.lisovskiy@intel.com</a>> --- > > (In reply to Nathan Ciobanu from <a href="show_bug.cgi?id=110954#c16">comment #16</a>) > > > On Tue, Aug 20, 2019 at 10:02:48AM +0000, <a href="mailto:bugzilla-daemon@freedesktop.org">bugzilla-daemon@freedesktop.org</a> > > > wrote: > > > > <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor" href="show_bug.cgi?id=110954">https://bugs.freedesktop.org/show_bug.cgi?id=110954</a> > > > > > > > > --- <a href="show_bug.cgi?id=110954#c15">Comment #15</a> from Stanislav Lisovskiy <<a href="mailto:stanislav.lisovskiy@intel.com">stanislav.lisovskiy@intel.com</a>> --- > > > > (In reply to Nathan Ciobanu from <a href="show_bug.cgi?id=110954#c13">comment #13</a>) > > > > > (In reply to Stanislav Lisovskiy from <a href="show_bug.cgi?id=110954#c12">comment #12</a>) > > > > > > What do you mean by "that if you wait for the this reprobing to finish and > > > > > > then play the video the flash will not occur"? > > > > > > > > > > > > So it does not happen once you start playback, but at some point before this? > > > > > > > > > > The flash happens if you play the video (with audio) before the reprobe, If > > > > > you play the video after reprobe it doesn't occur. > > > > > > > > But when does reprobe occur? Does it occur on its own or after you replug it or > > > > some other action? > > > It always occurs regardless of my actions. > > > > That is weird then. It should occur only once you do hotplug/change display > > configuration. It should not happen on its own, probably that might be origin > > of this issue. > That is my suspicion as well. I don't know how hda behaves in MST situations > but maybe it isn't "ready" right away when the displays finish training but > may become "ready" a few seconds later and thus trigger a reprobe. To prove > this which register do I need to print? > > Thanks, > Nathan > > > > > > > > > > > > > -- > > > > You are receiving this mail because: > > > > You are on the CC list for the bug. > > > > -- > > You are receiving this mail because: > > You are on the CC list for the bug. The dmesg log looks flooded with hpd irq events like this "gen8_de_irq_handler] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040, long 0x00000000", I don't think this is even related to hda, most likely there is some issue with DP MST itself. The flash probably just happens as a result of constant reprobing and simultaneous modeset. Userspace starts reprobing after it gets uevent sent by the driver in response to hpd irq.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>