[Bug 110308] [KBL]Screen black with some specific refresh rate due to "out of frequency scope"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110308

--- Comment #12 from Clinton Taylor <clinton.a.taylor at intel.com> ---
(In reply to Lakshmi from comment #10)
> (In reply to Ren Chenglei from comment #0)
> > Hardware: KBL NUC7i5BNH and display ViewSonic TD2230 
> > System: Ubuntu 18.04.2 LTS
> > Kernel: Linux 5.1.0-rc3+ x86_64
> > Description: When switch to some specific refresh rate, screen black and
> > show with "out of frequency scope", wait for some time it will return to
> > last working mode.
> > Steps to reproduce: Setting -> Devices -> Displays -> Refresh Rate ->
> > 30.00Hz -> Apply.
> > Expect results: UI is normal and refresh rate change to 30Hz
> > Actual results: Screen black and show with "out of frequency scope", wait
> > for some time, it will return to last working mode.
> 
> How is the display connected? e.g HDMI?
> 
> @Clint, any comments from you?

I don't see anything in the dmesg log that would show a failure. The HDMI
output on the NUC is using LS/PCON and everything looks normal during the set
mode. Did this work prior to Kernel 5.1?

-Clint

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