[Bug 82102] 4k monitor edid rejected: EDID timing clock 297.00 exceeds claimed max 115MHz, fixing

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Sep 8 09:04:16 PDT 2014


--- Comment #8 from Roland Scheidegger <sroland at vmware.com> ---
(In reply to comment #7)
> (In reply to comment #6)
> > You GPU does not support 4k over HDMI.
> The specs at AMD claim this GPU does HDMI 1.4a 2 lanes of 340 Mhz dot clock
> each for a total of 640 Mhz.   Even if only one lane is populated on this
> card, that should still be 340 Mhz.   The modeline only asks for 297 Mhz.
Where to they claim that? I think you've been successfully fooled by the HDMI
forum, which allows anyone to implement some boring subfeatures noone is
interested in and leave out the only thing important, namely higher
frequencies, and still claiming newer standards (1.4 in this case) compliance
regardless (for receiver devices which don't have such a high resolution this
actually even makes sense). But don't worry AMD isn't the only one with "hdmi
1.4" and not supporting higher frequencies. In fact AMD clearly states max
resolution over hdmi is 1920x1200.
http://www.amd.com/en-gb/products/graphics/desktop/6000/6450# unless you've
found some other doc...
And yes low refresh rates are always a way around that, I think it's typically
not mentioned because it may not work (some monitors really might not like it).

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