[Intel-gfx] Is Skylake graphics completely broken with multiple monitors?

[Oskar Berggren]

Hi,

After trying two different machines I'm beginning to feel like Skylake is
completely unusable with multiple monitors connected. Is this a known
limitation? Am I the only one experiencing this?

First I tested on laptop Dell XPS 15 9550 with QHD display. Seems to work
fine with internal panel, though I haven't used it extensively. Immediately
or sometimes within a minute or two when I connect an external monitor
using HDMI the system freezes completely (ping reply stops). This is with
updated Fedora 23 with kernel from drm-intel-nigthly tested several times
during the last two months. I've reported this here:
https://bugs.freedesktop.org/show_bug.cgi?id=94625 with more details.


Now I've also got access to a Dell Precision Tower 3620. Being a tower,
this of course has no internal panel. Connecting one external monitor seems
to work, but again I've not used it extensively. The second I connect a
second monitor it freezes completely. Booting with two monitors connected
also doesn't work. This is with updated Fedora 23 and distribution kernel
4.4.6-300 (waiting for download/build of drm-intel-nigthly to finish). CPU
is i7-6700 stepping 3 microcode 0x74.

What else to do or test?

Both systems are using latest available BIOS from Dell.

Regards,
Oskar
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