I’ve two Samsung U28R552UQR shows. One is related through DisplayPort–to–USB-C, the opposite one through HDMI + Apple’s personal USB‑C Digital AV Multiport Adapter. The one related through HDMI appears significantly worse.
That is the output of ioreg -l -d0 -w 0 -r -c AppleDisplay, in case it’s useful:
+-o AppleDisplay <class AppleDisplay, id 0x10000ca40, registered, matched, energetic, busy 0 (0 ms), retain 9>
{
"IOClass" = "AppleDisplay"
"CFBundleIdentifier" = "com.apple.iokit.IOGraphicsFamily"
"IOProviderClass" = "IODisplayConnect"
"DisplayProductID" = 4119
"IODisplayEDID" = <00ffffffffffff004c2d17104e344530041f0103803f24782ac8b5ad50449e250f5054bfef80714f810081c081809500a9c0b300010108e80030f2705a80b0588a0078682100001e000000fd00324b1e873c000a202020202020000000fc004c5532385235350a2020202020000000ff00484e4d523130303130370a202001e4020335f04961120313041f10605f2309070783010000e305c0006b030c001000b8442000200167d85dc40178800be3060501e20f81023a801871382d40582c450078682100001e023a80d072382d40102c458078682100001e04740030f2705a80b0588a0078682100001e565e00a0a0a029503020350078682100001a000049>
"IODisplayPrefsKeyOld" = "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/EGP0@0/IOPP/EGP1@0/IOPP/GFX0@0/AMDRadeonX6000_AmdRadeonControllerNavi14/ATY,Boa@1/display0/AppleDisplay-4c2d-1017"
"IODisplayPrefsKey" = "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/EGP0@0/IOPP/EGP1@0/IOPP/GFX0@0-4c2d-1017-b38a4de4e70693f2"
"IOProbeScore" = 2000
"IOPowerManagement" = {"CapabilityFlags"=49152,"MaxPowerState"=3,"CurrentPowerState"=3}
"IODisplayParameters" = {"pscn"={"min"=7500,"max"=10000,"worth"=10000},"rgsc"={"min"=0,"max"=65536,"worth"=65536},"bgsc"={"min"=0,"max"=65536,"worth"=65536},"vblm"={"min"=0,"max"=196608,"worth"=65536},"ownr"=4294969174,"ggsc"={"min"=0,"max"=65536,"worth"=65536}}
"IOMatchCategory" = "IODefaultMatchCategory"
"IOPersonalityPublisher" = "com.apple.iokit.IOGraphicsFamily"
"IODisplayConnectFlags" = <00000000>
"CFBundleIdentifierKernel" = "com.apple.iokit.IOGraphicsFamily"
"IODisplayAttributes" = {"IODisplayAttributes"=<676174760000000073676c6600000000726c6f63110100006364670080808000676c666401000000>,"IODisplayVSDBD85DC4"=<0178800b>,"IODisplayVSDB030C00"=<1000b84420002001>}
"DisplayVendorID" = 19501
"DisplaySerialNumber" = 809841742
}
+-o AppleDisplay <class AppleDisplay, id 0x10000ca44, registered, matched, energetic, busy 0 (0 ms), retain 9>
{
"IOClass" = "AppleDisplay"
"CFBundleIdentifier" = "com.apple.iokit.IOGraphicsFamily"
"IOProviderClass" = "IODisplayConnect"
"DisplayProductID" = 4117
"IODisplayEDID" = <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>
"IODisplayPrefsKeyOld" = "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/EGP0@0/IOPP/EGP1@0/IOPP/GFX0@0/AMDRadeonX6000_AmdRadeonControllerNavi14/ATY,Boa@2/display0/AppleDisplay-4c2d-1015"
"IODisplayPrefsKey" = "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/EGP0@0/IOPP/EGP1@0/IOPP/GFX0@0-4c2d-1015-94aedcc7a848d252"
"IOProbeScore" = 2000
"IOPowerManagement" = {"CapabilityFlags"=49152,"MaxPowerState"=3,"CurrentPowerState"=3}
"IODisplayParameters" = {"pscn"={"min"=7500,"max"=10000,"worth"=10000},"rgsc"={"min"=0,"max"=65536,"worth"=65536},"bgsc"={"min"=0,"max"=65536,"worth"=65536},"vblm"={"min"=0,"max"=196608,"worth"=65536},"ownr"=4294969176,"ggsc"={"min"=0,"max"=65536,"worth"=65536}}
"IOMatchCategory" = "IODefaultMatchCategory"
"IOPersonalityPublisher" = "com.apple.iokit.IOGraphicsFamily"
"IODisplayConnectFlags" = <00000000>
"CFBundleIdentifierKernel" = "com.apple.iokit.IOGraphicsFamily"
"IODisplayAttributes" = {"IODisplayAttributes"=<676174760000000073676c6600000000726c6f63010000006364670080808000676c666401000000>}
"DisplayVendorID" = 19501
"DisplaySerialNumber" = 809841742
}
The primary one is the one that appears dangerous, the second is the one that appears good. Particularly, the primary one appears to have an 80 because the twentieth (counting from 0) EDID byte, which signifies digital output with undefined bit depth and video interface. The second appears to have a b5, which signifies digital output with 10-bit colour depth and a DisplayPort interface, as anticipated. Is that this a recognized challenge with Apple’s adapter? Ought to I attempt overriding the EDID?
I’m utilizing a 16-inch Intel MacBook Professional from 2019.
