[Bug 111553] Linux 4.10 and newer limit pixel clock to 165 MHz on Haswell-ULT laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111553

--- Comment #3 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Michael Hanselmann (hansmi) from comment #2)
> (In reply to Ville Syrjala from comment #1)
> > Is the connector on the laptop a DP/mini-DP or HDMI?
> 
> The electrical connector is an HDMI Type A, as is the connector on the
> monitor.
> 
> Would you like me to open the device to check whether there's any converter
> chip from DP to HDMI in the signal path (the mainboard pictures I found
> online were all of insufficient clarity)?

Nah. It's clearly there since we can talk to it.

So yeah, basically that means that you're trying to drive it out of spec, or
the manufacturer messed up and used a dual-mode chip that misreports its
maximum TMDS clock. We have to err on the side of caution and filter out modes
that look out of spec, doing otherwise would lead to some poor chap getting a
black screen.

However if you want you can still keep driving it out of spec with the custom
modeline. I guess the question is how would you add one under whatever wayland
compositor you use.

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