Comment # 8
on bug 102820
from dwagner
(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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