<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Intel HD 520 failed to train DP when connected with a external monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=93578#c59">Comment # 59</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 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:seb@deleuze.fr" title="Sébastien Deleuze <seb@deleuze.fr>"> Sébastien Deleuze</a> <pre>With latest Fedora 25 preview (kernel 4.8.3-300) and Wayland, there is some progress: my 4K screen display something but is still flickering every minute approximatively. In logs I can read: [ 137.523334] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun Reminder: I have a Dell XPS 13 9350 with 1.4.4 bios and A04 USB-C firmware + Google USB Type-C to DisplayPort Cable (<a href="https://store.google.com/product/usb_type_c_to_displayport_cable">https://store.google.com/product/usb_type_c_to_displayport_cable</a>). Please fix that, on a lot of laptop like mine USB-C is the only way to connect an external monitor. Also on latest kernel there is "just" the flickering to fix, so I guess we are not very far from getting that working correctly.</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 QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>