<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - 4K @ 60Hz over HDMI 2.0 not working with AMDGPU-DAL" href="https://bugs.freedesktop.org/show_bug.cgi?id=98333#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 4K @ 60Hz over HDMI 2.0 not working with AMDGPU-DAL" href="https://bugs.freedesktop.org/show_bug.cgi?id=98333">bug 98333</a> from <a class="email" href="mailto:smoki00790@gmail.com" title="smoki <smoki00790@gmail.com>"> smoki</a> <pre>(In reply to wiak from <a href="show_bug.cgi?id=98333#c9">comment #9</a>) > 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." <a href="http://www.hdtvtest.co.uk/news/ue55hu7500-201405083761.htm">http://www.hdtvtest.co.uk/news/ue55hu7500-201405083761.htm</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>