[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 #8 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Alex Deucher from comment #7)
> I think it blocks modes that require 6Ghz timings if the platform isn't
> validated for them.
What does "platform isn't validated for 6Ghz timings" mean?

Both the RX 460 and the 4k TV I use are officially advertised as supporting 4k
@ 60Hz, and indeed they work just fine in that mode if commit
ebbf7337e2daacacef3e01114e6be68a2a4f11b4 is not part of the kernel.

> Does everything work correctly if you remove the modes
> from your monitor section?
Removing the (not really used) ModeLine statements from the X11 config does in
fact change the symptoms when commit ebbf7337e2daacacef3e01114e6be68a2a4f11b4
is present: X11 will start then, but only to use what xrandr says to be a
"3840x2160 @ 30Hz" mode, but which the display picks up as some
not-really-filling-the-whole-screen signal, with black borders on both sides
(so an image is shown but compressed horizontally - in the usually active "just
scan" mode and also even if the display is manually forced to a 16:9 aspect
ratio).

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