[Bug 102820] [bisected][DC] commit ebbf7337e2daacacef3e01114e6be68a2a4f11b4 prevents X11 from starting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102820

--- Comment #11 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Alex Deucher from comment #9)
> Harry or Jordan can verify, but I think it means the board maker did not
> validate the HDMI connector for 6Ghz timings.  The asic may support it, but
> the board has to be validated to make sure the physical connector supports
> it and the traces are not too long, etc.  Some boards only support 4k at 60
> over DP.

This is the manufacturers page advertising my graphics board:

http://www.xfxforce.com/en-us/products/amd-radeon-rx-400-series/rx-460-4gb-heatsink-rx-460p4hfg5-

It couldn't be more affirmative regarding support of HDMI 2.0b and high refresh
rates for 4k modes...

(And practical experience during the last months also tells me: Yes, HDMI 4k @
60Hz output is stable - even when using a 4m length HDMI cable.

> The driver drops the higher bandwidth modes for HDMI connectors if the board
> does not support them.

I have looked if there are any firmware upgrades for this card or any hints
from others regarding lack of 4k 60 Hz support, but found neither. (I only
found unofficial firmware that switches on shader units the manufacturer keeps
dormant, but I am not using that.)

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