My goal: 3840x2160 @ 60Hz AND 2560x1440 scaled @ 60Hz on MBP Mid-2014 with Integrated Intel Graphics, Macos High Sierra -> MDP-HDMI -> Samsung MU7000 4K TV. The HiDPI scaled resolutions are important for my application. Please review my test results below before responding.
* “MBP with IG”: Mid-2014 Macbook Pro Retina with Integrated Intel Iris Pro graphics, High Sierra
* “MBP with DG”: Mid-2015 Macbook Pro Retina with Dual Intel Iris Pro + AMD Radeon R9 M370X Graphics, El Capitan
* Samsung UN49MU7000 49” 4K HDR TV, with HDMI UHD Color: ON
* Dell P2715Q 27" 4K Monitor
* Pluggable MDP-HDMI adapter bought Nov 5, 2018
* AmazonBasics High-Speed HDMI Cable, 10 Feet (https://www.amazon.com/gp/product/B014I8T0YQ)
MBP with DG -> MDP-HDMI -> HDMI cable -> Samsung MU7000(HDMI UHD Color: ON): Success. 3840x2160 @ 60Hz AND 2560x1440 scaled @ 60Hz (as well as other scaled resolutions). No SwitchResX or other hacks required. Works right out of the box.
MBP with IG -> MDP-HDMI -> HDMI cable -> Samsung MU7000(HDMI UHD Color: ON): Failure. TV display is garbled, mostly all orange with horizontal strip of garbage on top. This is my “goal” hardware configuration described above.
MBP with IG -> MDP-HDMI -> HDMI cable -> Samsung MU7000(HDMI UHD Color: OFF): Stuck at 30 Hz. 3840x2160 @ 30Hz works, but there is no option for anything higher in Display Preferences. 2560x1440 @ 30Hz works, but is is obviously blurry and not scaled. No SwitchResX or other hacks required. 30 Hz is not useable for me.
MBP with IG -> Dell-supplied mDP to DP cable -> Dell P2715Q: Success. 3840x2160 @ 60Hz AND 2560x1440 scaled @ 60Hz (as well as other scaled resolutions). No SwitchResX or other hacks required. Works right out of the box.
Scenario #1 proves that the MDP-HDMI adapter, HDMI cable, and Samsung TV all “work” and that the “MDP-HDMI -> HDMI cable -> Samsung MU7000” combination is in fact capable of displaying 4K and scaled 4K resolutions @ 60Hz - at least with the MBP with Dual Graphics as the source.
Scenario #4 proves that the MBP with IG “works” and that it is in fact capable of outputting 4K and scaled 4K resolutions @ 60Hz via displayport - at least with a 4K displayport monitor such as the Dell P2715Q.
Every individual component of scenario #2 has been proven to achieve the 4k@60Hz goal, yet this combination, fails. It would be easy to conclude that the Macbook Pro with Integrated Graphics doesn’t support 4k@60Hz output and scaled resolutions, except that #4 disproves this.
It should be noted that the MBP with DG is running El Capitan versus High Sierra for the MBP with IG. I would suspect this as a factor if it were not for the fact that this does not prevent #4 from working.
Other stuff I tried:
* Custom SwitchResX resolution with #2 above: This *did* produce 3840x2160@60Hz, but all attempts at a scaled 2560x1440 failed. * Enabling HiDPI mode and creating a custom plist file as described here: https://github.com/Floris497/mac-pixel-clock-patch-V2/issues/217. No change.
* Why doesn't scenario #2 work? What am I missing here? * Does the Pluggable MDP-HDMI adapter simply not support MBP with Integrated Graphics at 60Hz? If so, why not? * Is there a firmware update that might help me out?
I would appreciate any help anyone can provide. Thanks.