[Bug 95392] Trying to set mode 3840x2160 at 60 Hz results in a crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95392

--- Comment #7 from Oli <b52 at reaktor42.de> ---
(In reply to Ville Syrjala from comment #3)
> [   12.914535] [drm:intel_update_cdclk] Current CD clock rate: 450000 kHz
> [   91.861529] [drm:intel_dump_crtc_timings] crtc timings: 533280 3840 3848
> 3992 4000 2160 2214 2219 2222, type: 0x0 flags: 0x9
> 
> Your cdclk is too low for that mode. I have a branch which has the required
> bits to adjust cdclk dynamically on SKL:
> git://github.com/vsyrjala/linux.git skl_bxt_cdclk_part_2
> 
> Can you test with that branch?

I did and it seems to works, at least the display didn't blank and xrandr
reports 60 Hz. Though, I have no way to tell if this is really the case,
because my display won't show this information.

See the attached dmesg output for more information. I used the same drm.debug
settings as before.

PS: Is this fix going upstream some time?

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