Comment # 13
on bug 102820
from Alex Deucher
(In reply to dwagner from comment #11) > > 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... It's pretty vague unfortunately regarding HDMI: "Latest Display Connections Ready for the latest displays Radeon™ GPUs with the Polaris architecture support HDMI® 2.0b and DisplayPort™ 1.3 for compatibility with a new generation of monitors that would make any gamer excited: • 1080p @ 240Hz • 1440p @ 240Hz • 4K @ 120Hz • 1440p ultra-wide @ 190Hz" It does not explicitly say 4K@60 on HDMI. The high refresh rates may only be available on DP. HDMI 2.0b does not imply 4K@60. > > (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. > Your board may work, but others might not depending on the board, cable, monitor, etc. > > 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.) The display features that are validated are stored in the vbios and the vbios is updated by the board vendor based on what features they validated on the board.
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