<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] Intel HD 520 failed to train DP when connected with a external monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=93578#c101">Comment # 101</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] Intel HD 520 failed to train DP when connected with a external monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=93578">bug 93578</a> from <a class="email" href="mailto:mads@ab3.no" title="Mads <mads@ab3.no>"> Mads</a> <pre>(In reply to Mads from <a href="show_bug.cgi?id=93578#c100">comment #100</a>) > (In reply to Mads from <a href="show_bug.cgi?id=93578#c95">comment #95</a>) > > Tested DP MST with a fresh drm-tip today (commit > > 0a03ea9496b49746b4964d05cc1f483385d1df8a), and it seems like daisy chaining > > triggers the same kind of behaviour as with the DA200 dongle, so maybe the > > error is related. > > > > When Daisy chaining two Dell U2715H monitors through DisplayPort, the last > > monitor in the chain cannot get a resolution higher than the range > > previously mentioned here (1024x768 works, 1600x1200 does not, 1920x1080 > > does not). > > It just dawned on me that I tested this through a Dell WD15 docking, maybe > DP MST works if you don't use that (maybe the WD15 got the same data link > issue as DA200). > > I got a standard non-Dell USB-C to DP dongle that I know works with 4k @ > 60Hz, I can try if DP MST works with that on monday. My suspicions were correct, with a standard non-dell USB-C to DP dongle, DP MST works like a charm. Writing this reply with two Dell U2715H monitors connected, both with 2560x1440@60Hz. So, making DA200 work with Linux might fix lots of docking issues :)</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>