Hello, 

DDM is not recognizing my Dell U2717D over HDMI connection.

Latest Dell drivers are installed. DDC/CI is enabled in monitor settings.

Here is the log

Diagnostic Report, generated 30.11.2020 г. (10.0.19041)
Copyright (c) 1995-2020, EnTech Taiwan.
Version = 1.51.0.2015
OS = 10.0.19041.2 x64
Mechanism = 3
Account = Standard
Command line = "C:\Program Files (x86)\Dell\Dell Display Manager\ddm.exe"
////////////////////////////////////////
Configuration settings:
DriverError = Dell U2717D=Intel
LastCheck = 0x0000AC85
HintShown = 0x00000001
AutoRestoreWindowLayout = 0x00000000
EApolicy = 2000 2000 2000 2000 2000 2000
EnumErrorCount = 0x00000000
////////////////////////////////////////
09:17:40.827...Log opened
09:17:40.832...WinOS = 19041
09:17:40.867...LanguageID = 00000409 00000409 00000402
09:17:40.876...Build = 1.51.0.2015
09:17:40.877...Windows handles = 000201A6 00010150 000101AA
09:17:40.878...OS monitor sleep timeout value = 0 ms.
09:17:40.879...Applied DPI = 96-96
09:17:40.879...VM = 0
09:17:40.880...Registered DDM popup hotkey = Shift+Ctrl+D 6044
09:17:40.880...Registered EA layout MRU hotkey = Shift+Ctrl+Home 6024
09:17:40.881...Registered application window hotkey = Shift+Ctrl+Ins 602D
09:17:40.882...Remote asset management = 1
09:17:40.882...Remote registry service state = 4
09:17:40.939...WMI service state (unless firewalled) = 1
09:17:41.113...DMA = 3
09:17:41.128...Starting enumeration
09:17:41.143...Skipping unsupported device MONITOR\AUO323D\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:17:41.147...1. DEL40EB.J0XYN93UEZJS on Intel(R) UHD Graphics
09:17:41.148......Monitor assignment = 1
09:17:41.149......Adapter name = \\.\DISPLAY1
09:17:41.151......Monitor name = Dell U2717D (HDMI)
09:17:41.151......Vendor ID = 8086
09:17:41.152......GPU driver = igdumdim64 26.20.100.7870
09:17:41.153......Flags = 00000005.00000003
09:17:41.153......Display tag = 345680EA
09:17:41.154......Monitor handle = 00030129
09:17:41.154......Monitor screen area = 0,0 x 2560,1440 2560x1440
09:17:41.155......Monitor work area = 0,0 x 2560,1400 2560x1400
09:17:41.155......Monitor scaling factor = 100%
09:17:41.155......Raw EDID = 00FFFFFFFFFFFF0010ACEB40534A5A450D1D0103803C22782AEE95A3544C99260F5054A54B00714FA9408180D1C00101010101010101565E00A0A0A029503020350055502100001A000000FF004A3058594E393355455A4A530A000000FC0044454C4C205532373137440A20000000FD00324B1E5819000A2020202020200134
09:17:41.365......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:17:41.366......Error: failed to obtain output mask from display driver
09:17:44.083......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:17:44.084......Error: failed to obtain output mask from display driver
09:17:49.296......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:17:49.299......Error: failed to obtain output mask from display driver
09:17:49.301......Discarding unsupported display: DEL40EB.J0XYN93UEZJS on Intel(R) UHD Graphics
09:17:49.308......Check: monitor and connection to monitor to ensure DDC/CI is supported and enabled
09:17:49.319......Status = 00000000
09:17:49.320...Ending enumeration
09:17:49.323...New=DEL40EB.0003
09:17:49.333...Video power down timeout = 0
09:17:49.336...Display powered ON
09:17:49.337...User session connect
09:17:54.347...Refreshing screen object
09:18:17.057...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
09:18:17.058...Dump: Windows device enumeration
09:18:17.066...Display adapters:
09:18:17.069.....1.NVIDIA GeForce MX250
09:18:17.069.....2.Intel(R) UHD Graphics
09:18:17.069...Monitors:
09:18:17.071.....1.Generic PnP Monitor
09:18:17.071.....2.Dell U2717D (HDMI)
09:18:17.071...Visible monitors = 1
09:18:17.071...1.DeviceName = \\.\DISPLAY1
09:18:17.072.....DeviceFlags = 00000005
09:18:17.072.....DeviceString = Intel(R) UHD Graphics
09:18:17.072.....DeviceID = PCI\VEN_8086&DEV_9B41&SUBSYS_150F1043&REV_02
09:18:17.072.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{C4E301F6-F765-11EA-9DCA-98AF651ACAB6}\0000
09:18:17.073.....a.MonitorName = \\.\DISPLAY1\Monitor0
09:18:17.073.......MonitorFlags = 00000002
09:18:17.073.......MonitorString = Generic PnP Monitor
09:18:17.073.......MonitorID = MONITOR\AUO323D\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.073.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.074.......Raw EDID = 00FFFFFFFFFFFF0006AF3D3200000000331C0104A51F117802F415A356529D280A505400000001010101010101010101010101010101143780B87038244010103E0035AE100000180000000F0000000000000000000000000020000000FE0041554F0A202020202020202020000000FE004231343048414E30332E32200A009B
09:18:17.074.....b.MonitorName = \\.\DISPLAY1\Monitor1
09:18:17.074.......MonitorFlags = 00000003
09:18:17.075.......MonitorString = Dell U2717D (HDMI)
09:18:17.075.......MonitorID = MONITOR\DEL40EB\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:18:17.075.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:18:17.075.......Raw EDID = 00FFFFFFFFFFFF0010ACEB40534A5A450D1D0103803C22782AEE95A3544C99260F5054A54B00714FA9408180D1C00101010101010101565E00A0A0A029503020350055502100001A000000FF004A3058594E393355455A4A530A000000FC0044454C4C205532373137440A20000000FD00324B1E5819000A2020202020200134
09:18:17.076...2.DeviceName = \\.\DISPLAY2
09:18:17.076.....DeviceFlags = 00000000
09:18:17.076.....DeviceString = Intel(R) UHD Graphics
09:18:17.076.....DeviceID = PCI\VEN_8086&DEV_9B41&SUBSYS_150F1043&REV_02
09:18:17.076.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{C4E301F6-F765-11EA-9DCA-98AF651ACAB6}\0001
09:18:17.077.....a.MonitorName = \\.\DISPLAY2\Monitor0
09:18:17.077.......MonitorFlags = 00000002
09:18:17.078.......MonitorString = Generic PnP Monitor
09:18:17.079.......MonitorID = MONITOR\AUO323D\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.079.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.080.......Raw EDID = 00FFFFFFFFFFFF0006AF3D3200000000331C0104A51F117802F415A356529D280A505400000001010101010101010101010101010101143780B87038244010103E0035AE100000180000000F0000000000000000000000000020000000FE0041554F0A202020202020202020000000FE004231343048414E30332E32200A009B
09:18:17.081...3.DeviceName = \\.\DISPLAY3
09:18:17.081.....DeviceFlags = 00000000
09:18:17.081.....DeviceString = Intel(R) UHD Graphics
09:18:17.081.....DeviceID = PCI\VEN_8086&DEV_9B41&SUBSYS_150F1043&REV_02
09:18:17.082.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{C4E301F6-F765-11EA-9DCA-98AF651ACAB6}\0002
09:18:17.082.....a.MonitorName = \\.\DISPLAY3\Monitor0
09:18:17.082.......MonitorFlags = 00000002
09:18:17.082.......MonitorString = Generic PnP Monitor
09:18:17.083.......MonitorID = MONITOR\AUO323D\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.083.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
09:18:17.083.......Raw EDID = 00FFFFFFFFFFFF0006AF3D3200000000331C0104A51F117802F415A356529D280A505400000001010101010101010101010101010101143780B87038244010103E0035AE100000180000000F0000000000000000000000000020000000FE0041554F0A202020202020202020000000FE004231343048414E30332E32200A009B
09:18:17.084...Total number of monitors enumerated = 4
09:18:17.084...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\