[Bug 99908] [SKL][i915] driver crashes with dual 4k monitors on Intel HD 520

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99908

Phil Hord <phil at phord.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEEDINFO                    |RESOLVED

--- Comment #14 from Phil Hord <phil at phord.com> ---
I built the kernel from drm-tip:
    drm-intel-nightly @ 3cbfafbde5bb92b  (4.13.0+)

It is more stable for me.  
* I do not see any errors reported yet about FIFOs in syslog;
* Attempting to set the mode for 2 monitors to 4k at 60hz does not crash, but
neither does it succeed. 
* I am able to configure both monitors for 4k at 30hz, and this does seem to work
sometimes.

I often get some error reported from xrandr about being unable to apply this
configuration.  It's possible some Ubuntu configurator is responding to hotplug
events and fighting with me.  I can't quite tell; but I do get an error message
on the GUI sometimes about being unable to apply this requested mode.

After fighting with it via xrandr (for about 2 hours) I can eventually get
4k at 30Hz on two monitors at the same time.  So the display driver seems to be
doing the right thing now.

I don't know why 60Hz doesn't work, though. Should it work? Is there some video
card limitation that prevents it?

Thanks for your help, and thanks for updating the build guide.

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