Comment # 15
on bug 98333
from smoki
(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@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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