It’s quite a long post as I had some trouble signing up on the forum somehow.
I have kept a log of my troubles connecting my 4k screen at 60Hz with the CAC-1070 but I am making subtle progress.
The situation is as follows:
- Win10 x64
- AMD R390 (Gigabyte GV-R939G1 GAMING-8GD)
- HDMI 2.0 certified cables (bought a shorter one of 1meter to rule out cable lenght)
- sharkoon HDMI 2.0 “supports 4K x 2K 60Hz” 1.0m
- Sandberg HDMI 2.0 “[email protected]/60 2160p” 5.0m
- TV Samsung UE48JU6650S
- External Display HPw2207h (Via HDMI 1650*1050)
Output is maximum of 4k @ 30Hz.
I have tried to resolve the issue as follows:
- Disconnect cable from TV
- Installed latest firmware updates TV (v1443)
- Apply UHD Color setting to ‘ON’ on HDMI 1 port (STB/DVI)
- Note: Tv reports: “This mode is optimized for UHD 50p/60p 4:4:4 and 4:2:2 signals”
- TV resets
- On TV label input source HDMI 1 as: ‘DVI PC’
- Connect HDMI 2.0 cable to HDMI 1 port (STB/DVI)
- Installed latest Crimson Drivers 16.1.1
- Configure 8 bit video output through ‘Radeon Additional Settings’
- Reported Display Name: SAMSUNG
- (In Windows>Advanced display settings > display adapter properties > Monitor, the monitor type is reported as: Generic PnP Monitor)
- Max reported resolution: 4096×2160
- Max reported refreshrate: 75 Hz
- Multi-streamtransport capable: No
- Current color depth 8 bpc
- Restart PC
- Via Windows advanced display setting, select 4096×2160 (recommended) resolution
- Tried via display adapter properties / tab ‘monitor’ to select 60Hz. Not there.
- Repeated proces above with second cable, not working.
- Adjusted screenresolution to 1080p 24Hz as suggested, restarted; 4k @ 60Hz still not listed
- Updated firmware of CAC 1070 to 0x07 0x23
- Updated AMD drivers to 16.3.1.
- Retried adjusting screenresolution to 1080p 24Hz as suggested, restarted; 4k @ 60Hz still not listed
- Set custom resolution at 3840 X 2160 progressive CVT-reduced blanking
- This partially resulted in success. I noticed the refreshrate was 60Hz but there was a Haze or pixelarity throughout the screen which resulted in unreadable texts (see picture).
This is the result of custom resolution with reduced blanking. The image size on screen suggests 4k resolution, however the TV reports 1080P @60Hz.
The pixels are sharp so the image is in focus. However, the text is unreadable.
- Retried custom resolution under following circumstances:
|Label Source input||Gamemode||UHD Color||Outcome|
|PC||Of||Off||clear, but TV indicates 30p, youtube 24p, MSIafterburner 30p
- Noticed that after each try at custom resolution, the timing standard was put back to CVT, rather than CVT-reduced blanking.
- TV reported the hazed 4k image as 1920x1080p @60 Hz
- Reselected custom resolution 3840×2160 @ 60 Hz in mode DVI PC, Game Mode ON, UHD Color ON, I accepted the hazed image (no revertion) and rebooted in order to see if TV recognized and accepted new forced 4k signal. Failed, after reboot TV saw signal as HD. Hazed image remains
- Started Advanced display settings in windows, to check status. It reported 3840×2160, @75Hz. Downgraded this to 60Hz, screen then it automatically resized to 640×480 @60Hz (according to TV). Reselecting custom resolution through windows 3840*2160 resulted in non-hazed 30Hz non-fullscreen image.
- Next fase to reinstall windows10 as suggested, however, skeptical of relevance. Has this reportedly been effective for others?
Two weeks later:
- Before reïnstalling windows I went with my CAC 1070 to the store (Thanks, MediaMarkt), connected my cable to a gaminglaptop displayport 1.2 and identical Samsung ju6650 TV on settings: UHD ON, Labelsource PC (just as https://insights.club-3d.com/thread/working-mini-display-port-1-2-to-hdmi-2-0-2013-mac-pro-trashcan/ )
- This worked instantaneously. This rules out the fault is within
- the cable
- the CAC-1070 adapter
- So it must be either
- AMD R390 Gigabyte GV-R939G1 GAMING-8GD
- Windows 10 64x
- Samsung HDMI-port.
- At home I reïnstalled windows 10 64 bit: by resetting this PC, delete all files (get rid of old windows 7 files)
- Installed Crimson 16.4.1, reset television (to English language like in the store), UHD ON, input source labelled as PC,
- Power off PC and Television, connect cables. Power up.
- Got Error message from Radeon that “there is a problem with my Displayport preventing me from using the highest resolution”. Effective resolution 3840*2160 @30Hz
- Configured 8 bit, tried all three displayports, custom resolutions hazed. No success yet.
Next step is to bring home another device with displayport 1.2, to make sure the television accepts a 4k60Hz signal. That would narrow down the root cause to the computer’s end.
I wonder if you have any more suggestions or things I overlooked.
I’ll keep you posted,