[Bug 93578] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #59 from Sébastien Deleuze <seb at deleuze.fr> ---
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
(https://store.google.com/product/usb_type_c_to_displayport_cable).

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.

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