Drive Intel(R) UHD Graphics 620

Graphics settings

Support information for Intel(R) UHD Graphics 620

Specifications	Details
Processor Graphics	Intel(R) UHD Graphics 620
Graphics Base Frequency	300 MHz
Graphics Max Dynamic Frequency	1.00 - 1.15 GHz
Graphics Video Max Memory	32 GB
Graphics Output	eDP / DP / HDMI / DVI
4K Support	Yes, at 60 Hz
Max Resolution (HDMI 1.4)	4096x2304 @ 24 Hz
Max Resolution (DP)	4096x2304 @ 60 Hz
Max Resolution (eDP-Integrated Flat Panel)	4096x2304 @ 60 Hz
Max Resolution (VGA)	N/A
DirectX Support	12
OpenGL Support	4.5
Intel Quick Sync Video	Yes
Intel InTru 3D Technology	Yes
Intel Clear Video HD Technology	Yes
Intel Clear Video Technology	Yes
# of Displays Supported	3
Device ID	0x5917

Recommended framebuffer for Intel(R) UHD Graphics 620 (Kaby Lake Refresh) card:

AAPL,ig-platform-id		[Data]		0500C087
device-id			[Data]		C0870005

Software sleep function works flawlessly with the above mentioned settings: during sleep state both CapsLock and Fn leds are off. During wake up phase display wakes up properly (no more split screen issue!).

KBL connectors AppleIntelKBLGraphicsFramebuffer.kext:

ID: 87C00005, STOLEN: 57 MB, FBMEM: 0 bytes, VRAM: 1536 MB, Flags: 0x00A30702
TOTAL STOLEN: 58 MB, TOTAL CURSOR: 1 MB (1572864 bytes), MAX STOLEN: 172 MB, MAX OVERALL: 173 MB (181940224 bytes)
Model name: Intel UHD Graphics 617
Camellia: CamelliaV3 (3), Freq: 1388 Hz, FreqMax: 1388 Hz
Mobile: 1, PipeCount: 3, PortCount: 3, FBMemoryCount: 3
[0] busId: 0x00, pipe: 8, type: 0x00000002, flags: 0x00000098 - ConnectorLVDS
[1] busId: 0x05, pipe: 9, type: 0x00000400, flags: 0x000003C7 - ConnectorDP
[2] busId: 0x04, pipe: 10, type: 0x00000400, flags: 0x000003C7 - ConnectorDP
00000800 02000000 98000000
01050900 00040000 C7030000
02040A00 00040000 C7030000

Intel(R) UHD Graphics 620 (Kaby Lake Refresh) card configuration:

<key>PciRoot(0x0)/Pci(0x2,0x0)</key>
	<dict>
		<key>AAPL,ig-platform-id</key>
		<data>BQDAhw==</data>
		<key>AAPL,slot-name</key>
		<string>Internal</string>
		<key>device-id</key>
		<data>wIcABQ==</data>
		<key>device_type</key>
		<string>VGA compatible controller</string>
		<key>disable-external-gpu</key>
		<data>AQAAAA==</data>
		<key>dpcd-max-link-rate</key>
		<data>FAAAAA==</data>
		<key>enable-dpcd-max-link-rate-fix</key>
		<data>AQAAAA==</data>
		<key>enable-hdmi20</key>
		<data>AQAAAA==</data>
		<key>force-online</key>
		<data>AQAAAA==</data>
		<key>framebuffer-con0-enable</key>
		<data>AQAAAA==</data>
		<key>framebuffer-con0-flags</key>
		<data>mAAAAA==</data>
		<key>framebuffer-con0-type</key>
		<data>AgAAAA==</data>
		<key>framebuffer-con1-enable</key>
		<data>AQAAAA==</data>
		<key>framebuffer-con1-flags</key>
		<data>xwMAAA==</data>
		<key>framebuffer-con1-type</key>
		<data>AAgAAA==</data>
		<key>framebuffer-con2-enable</key>
		<data>AQAAAA==</data>
		<key>framebuffer-con2-flags</key>
		<data>xwMAAA==</data>
		<key>framebuffer-con2-type</key>
		<data>AAgAAA==</data>
		<key>framebuffer-fbmem</key>
		<data>AACQAA==</data>
		<key>framebuffer-patch-enable</key>
		<data>AQAAAA==</data>
		<key>framebuffer-stolenmem</key>
		<data>AABgAg==</data>
		<key>framebuffer-unifiedmem</key>
		<data>AAAAgA==</data>
		<key>hda-gfx</key>
		<string>onboard-1</string>
		<key>model</key>
		<string>Intel UHD Graphics 620</string>
	</dict>

External Display support

According to ioregistryExplorer, Framebuffer@0 (Connector 0) is LVDS (Internal Display).
Framebuffer@1 (Connector 1), Framebuffer@2 (Connector 2) are pointing to DisplayPort and HDMI respectively.
Refer to gfxutil, path of iGPU is DevicePath = PciRoot(0x0)/Pci(0x2,0x0)
HDMI is working perfectly, video and audio output are both working flawlessly.

Digital Audio (HDMI / DVI / DP)

To enable digital audio it is necessary to set the necessary properties and, usually, patch the connectors. To enable audio in general and HDMI in particular use WEG along with AppleALC.kext. On 10.10.5 and above, WEG automatically changes the connector-type of DP (00040000) to HDMI (00080000) if no custom patches are used. The actual connection may be of any type (HDMI / DVI / DP), but for the digital audio to function the connector-type must explicitly be HDMI.

When HDMI plugged in, macOS would recognize as DP (busID: 0x05), not HDMI (busID: 0x04).

List of busID and ports recognized in macOS:

DP	HDMI	DVI
0x02	0x00	0x01
0x04	0x02	0x02
0x05	0x04	0x04
0x06	0x06	0x06

framebuffer-conX-enable
01000000 -> Enable, 00000000 -> Disable
framebuffer-conX-type 00000800 -> HDMI output, 00000400 -> DP output
framebuffer-conX-index fffffff -> Block
framebuffer-unifiedmem 00000080 -> VRAM to 2048M, 000000C0 -> VRAM to 3072M
framebuffer-fbmem 00009000 -> 9M for FHD, 00000003 -> 48M for QHD/UHD
All framebuffer values can be insert as NUMBER type, except ig-platform-id.

Display fixes

On macOS > 10.13.6, to enable higher HiDPI resolution, you need to set DVMT to 64 MB first: this, in general, means a CFG-unlocked machine.

Use xzhih's one-key-hidpi to improve quality of system UI. Script can be run in remote or local mode: I choose local one. My steps are the following:

download ZIP archive, decompressing it and double click hidpi.command to run
select Enable HIDPI (with EDID) [choice #2]
select MacBook Pro [choice #3]
select 3000x2000 for resolution config [choice #5]
reboot

After reboot, more HiDPI resolutions become available like 3000x2000, 2880x1920, 2250x1500, 1920x1280. The configuration file DisplayProductID-422a for our display (JDI422a) can be found in the path /System/Library/Displays/Contents/Resources/Overrides/ in DisplayVendorID-2889 folder. If you want to "identify" your actual "Display profile" in "System Preferences" -> "Display Preferences", do the following steps:

cd /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-2889
sudo nano DisplayProductID-422a

paste this code

<key>DisplayProductName</key>
<string>Huawei JDI422a Retina Display</string>

and press <Ctrl> + <X>, then respond with <Y> (for "Yes") and then press <Enter> to save the file and exit nano editor. Restart the laptop. For reference see here