[Bug 98333] 4K @ 60Hz over HDMI 2.0 not working with AMDGPU-DAL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98333

--- Comment #15 from smoki <smoki00790 at gmail.com> ---
(In reply to wiak from comment #9)
> Hey i got the exact same issue with a Samsung HU7505 4k60 television using
> amdgpu on xubuntu 16.04.1/16.10, amdgpu-pro-16.50-362463 drivers work in
> 4k60 until the display is turned off and then it gives "mode not supported"
> 

 On pro it might be just DPMS on/off issue or some monitors (this is actually
TV where DPMS is usually off by default) or specific issues/customizations
like:

 "Samsung offers a new user-accessible control called [HDMI UHD Color] on its
2014 range of UHDTVs. Instead of expanding the TV’s gamut to fulfil Rec.2020
colour space (we wished), it serves to provide support for up to 4:4:4 chroma
resolution with 4K at 60p/50p sources, indicating that the 55HU7500′s onboard HDMI
2.0 chip is a full-bandwidth, Level A version. [HDMI UHD Color] has to be
enabled manually for each HDMI port where 4K res with 4:2:2 or 4:4:4
reproduction is required, because the chroma information is not auto-detected
by the chip Samsung is using."

 http://www.hdtvtest.co.uk/news/ue55hu7500-201405083761.htm

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