<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Screen is frozen on second connection of DP MST dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=107546#c41">Comment # 41</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Screen is frozen on second connection of DP MST dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=107546">bug 107546</a> from <a class="email" href="mailto:bward@redhat.com" title="Brian Ward <bward@redhat.com>"> Brian Ward</a> <pre>Hi, I have a Lenovo T460s that has exhibited similar behaviors. I think there are also many others with similar problems who have mistakenly looked at this bugzilla under xorg: <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1470960">https://bugzilla.redhat.com/show_bug.cgi?id=1470960</a> I am not on the latest (currently 4.19.3-200.fc28.x86_64) but I'm happy to build to suit. I'll review the existing comments and attempt to build the drm-tip shortly to see if I can reproduce on that. In my case, I notice this when booting from dock or not booting from dock, always with two monitors. The first docking both monitors work fine. The first undock followed by the second docking, I get errors like others have noted. I've tested docking with one monitor, either DVI or HDMI, and each one alone works fine with multiple docks. One interesting note of difference I can add is that I've noticed my problem only exhibits when I'm docked at the office with one monitor that is DVI and one monitor that is HDMI. When I have two displayports docked at home and undock, I never have this problem. Another interesting note I've found is that when I set drm.debug=14 and log_buf_len=16M on the drm module in the boot options, I found that the behavior did not always reproduce. If anything stands out as distinctly different from the original post let me know and I can file another bug if I reproduce on drm-tip. Sergey's config looks like they are both displayports. T460S thinkpad ultra dock P/N SD20A06046 Type 40A2 S/N M3-A0AC8E 16/11</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> </ul> </body> </html>