[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

--- Comment #15 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
(In reply to Phil Hord from comment #14)
> 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.
There seems to be an actual thing with 60Hz as stated by
https://bugs.freedesktop.org/show_bug.cgi?id=101390#c12. Good to hear is
working now. And thanks for helping to improve the build guide. Regards.

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