I've looked at other posts about this issue and I haven't been able to find a working solution.

I'm running a Dell XPS 8940 computer with two monitors. One is a generic Samsung and the other is the Dell U2715H. I'm on Windows 11. DDC/CI worked fine until recently when the Dell stopped responding to commands while the Samsung still works fine. 

The Dell Display Monitor shows a warning

 

I have an NVIDIA GeForce 3060 Ti card. It's running Driver v30.0.15.1179. The Dell Monitor is running v1.0.0.0. I have installed the latest Dell Monitor Installer as well. 

The monitor is connected to the NVIDIA card via DisplayPort and connects to the monitor via a mini-DisplayPort connector. I have ordered a full DisplayPort cable and I'll see if that helps when it arrives. 

Should I be upgrading the Intel Display Drivers when notified?

I've created a report from DDM. Here are the results.  Any help is appreciated. 

Diagnostic Report, generated 2022-04-02 (10.0.22000)
Copyright (c) 1995-2022, EnTech Taiwan.
Version = 1.55.0.2090
OS = 10.0.22000.2 x64
Mechanism = 3
Account = Standard
Command line = "C:\Program Files (x86)\Dell\Dell Display Manager\ddm.exe"
////////////////////////////////////////
Configuration settings:
DriverError = Dell U2715H=NVidia
LastRC = ExpandConstant = Invalid command
EApolicy = 2028 2028 2028 2028 2028 2028
LastCheck = 0x0000AE6D
LCID = 0x00000409
EnumErrorCount = 0x00000000
HintShown = 0x00000001
////////////////////////////////////////
09:28:00.118...Log opened
09:28:00.127...WinOS = 0
09:28:00.167...LanguageID = 0409 0409 1009
09:28:00.188...Build = 1.55.0.2090
09:28:00.189...Windows handles = 00010164 00030048 0001016E
09:28:00.192...OS monitor sleep timeout value = 900 ms.
09:28:00.193...Applied DPI = 96-96
09:28:00.194...VM = 0
09:28:00.206...VD = {3E999E2A-FBF8-4579-9A29-EF60C6D352D1}
09:28:00.209...Registered DDM popup hotkey = Shift+Ctrl+D 6044
09:28:00.211...Registered EA layout MRU hotkey = Shift+Ctrl+Home 6024
09:28:00.212...Registered application window hotkey = Shift+Ctrl+Ins 602D
09:28:00.216...Remote asset management = 1
09:28:00.217...Remote registry service state = 4
09:28:00.353...WMI service state (unless firewalled) = 1
09:28:00.410...DMA = 0x03
09:28:00.418...Starting enumeration
09:28:00.485...Skipping unsupported device MONITOR\SAM0D1A\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:28:00.487......Status = 00000000
09:28:00.490...2. DELD066.H7YCC53K16ZL on NVIDIA GeForce RTX 3060 Ti
09:28:00.492......Monitor model = Dell U2715H
09:28:00.493......Monitor assignment = 1
09:28:00.493......Adapter name = \\.\DISPLAY2
09:28:00.494......Monitor name = DELL U2715H(miniDisplayPort)
09:28:00.495......Vendor ID = 10DE
09:28:00.496......GPU driver = c:\windows\system32\driverstore\filerepository\nvddi 30.0.15.1179
09:28:00.497......Flags = 00000005.00000003
09:28:00.497......Display tag = 4156A566
09:28:00.497......Monitor handle = 00010001
09:28:00.498......Monitor screen area = 0,0 x 2560,1440 2560x1440
09:28:00.498......Monitor work area = 0,0 x 2560,1392 2560x1392
09:28:00.499......Monitor scaling factor = 100%
09:28:00.499......Raw EDID = 00FFFFFFFFFFFF0010AC66D04C5A36310C190104A53C22783E4455A9554D9D260F5054A54B00B300D100714FA9408180778001010101565E00A0A0A029503020350055502100001A000000FF00483759434335334B31365A4C0A000000FC0044454C4C205532373135480A20000000FD0038561E711E010A2020202020200141
09:28:00.704......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:28:00.798......NVidia device handle = 80061086
09:28:00.964......Error: failed to obtain capabilities string from display driver
09:28:03.664......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:28:03.733......NVidia device handle = 80061086
09:28:03.853......Error: failed to obtain capabilities string from display driver
09:28:09.153......Error: communicating via DDC/CI (0xC0262582) = An error occurred while transmitting data to the device on the I2C bus
09:28:09.231......NVidia device handle = 80061086
09:28:09.355......Error: failed to obtain capabilities string from display driver
09:28:09.356......Discarding unsupported display: DELD066.H7YCC53K16ZL on NVIDIA GeForce RTX 3060 Ti
09:28:09.358......Check the OSD, cables, and the NVidia 30.0.15.1179 display driver for DDC/CI support (0xC0262582)
09:28:09.369......Status = 00000000
09:28:09.369...Ending enumeration
09:28:09.370...New=SAM0D1A.0003 DELD066.0004
09:28:09.379...Video power down timeout = 900
09:28:09.380...Display powered ON
09:28:09.380...User session connect
09:28:43.342...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
09:28:43.342...Dump: Windows device enumeration
09:28:43.348...Display adapters:
09:28:43.350.....1.Intel(R) UHD Graphics 750 - PCI\VEN_8086&DEV_4C8A&SUBSYS_09C51028&REV_04\{4d36e968-e325-11ce-bfc1-08002be10318}\0001
09:28:43.350.....2.NVIDIA GeForce RTX 3060 Ti - PCI\VEN_10DE&DEV_2489&SUBSYS_C9761028&REV_A1\{4d36e968-e325-11ce-bfc1-08002be10318}\0000
09:28:43.350...Monitors:
09:28:43.352.....1.DELL U2715H(miniDisplayPort) - MONITOR\DELD066\{4d36e96e-e325-11ce-bfc1-08002be10318}\0004
09:28:43.352.....2.Generic PnP Monitor - MONITOR\SAM0D1A\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:28:43.352...Visible monitors = 2
09:28:43.352...1.DeviceName = \\.\DISPLAY1
09:28:43.352.....DeviceFlags = 00000001
09:28:43.352.....DeviceString = NVIDIA GeForce RTX 3060 Ti
09:28:43.352.....DeviceID = PCI\VEN_10DE&DEV_2489&SUBSYS_C9761028&REV_A1
09:28:43.353.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787A-7BC2-11EC-A9D8-806E6F6E6963}\0000
09:28:43.353.....a.MonitorName = \\.\DISPLAY1\Monitor0
09:28:43.353.......MonitorFlags = 00000003
09:28:43.353.......MonitorString = Generic PnP Monitor
09:28:43.353.......MonitorID = MONITOR\SAM0D1A\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:28:43.353.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0003
09:28:43.353.......Raw EDID = 00FFFFFFFFFFFF004C2D1A0D554C5A5A261A010380301B782A5295A556549D250E5054BFEF80714F81C0810081809500A9C0B3000101023A801871382D40582C4500DD0C1100001E000000FD00324B1E5111000A202020202020000000FC00533232463335300A2020202020000000FF0048345A483931393232310A202001E8
09:28:43.353...2.DeviceName = \\.\DISPLAY2
09:28:43.354.....DeviceFlags = 00000005
09:28:43.354.....DeviceString = NVIDIA GeForce RTX 3060 Ti
09:28:43.354.....DeviceID = PCI\VEN_10DE&DEV_2489&SUBSYS_C9761028&REV_A1
09:28:43.354.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787A-7BC2-11EC-A9D8-806E6F6E6963}\0001
09:28:43.354.....a.MonitorName = \\.\DISPLAY2\Monitor0
09:28:43.354.......MonitorFlags = 00000003
09:28:43.354.......MonitorString = DELL U2715H(miniDisplayPort)
09:28:43.354.......MonitorID = MONITOR\DELD066\{4d36e96e-e325-11ce-bfc1-08002be10318}\0004
09:28:43.354.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0004
09:28:43.355.......Raw EDID = 00FFFFFFFFFFFF0010AC66D04C5A36310C190104A53C22783E4455A9554D9D260F5054A54B00B300D100714FA9408180778001010101565E00A0A0A029503020350055502100001A000000FF00483759434335334B31365A4C0A000000FC0044454C4C205532373135480A20000000FD0038561E711E010A2020202020200141
09:28:43.355...3.DeviceName = \\.\DISPLAY3
09:28:43.355.....DeviceFlags = 00000000
09:28:43.355.....DeviceString = NVIDIA GeForce RTX 3060 Ti
09:28:43.355.....DeviceID = PCI\VEN_10DE&DEV_2489&SUBSYS_C9761028&REV_A1
09:28:43.355.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787A-7BC2-11EC-A9D8-806E6F6E6963}\0002
09:28:43.355...4.DeviceName = \\.\DISPLAY4
09:28:43.355.....DeviceFlags = 00000000
09:28:43.355.....DeviceString = NVIDIA GeForce RTX 3060 Ti
09:28:43.355.....DeviceID = PCI\VEN_10DE&DEV_2489&SUBSYS_C9761028&REV_A1
09:28:43.355.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787A-7BC2-11EC-A9D8-806E6F6E6963}\0003
09:28:43.356...5.DeviceName = \\.\DISPLAY5
09:28:43.356.....DeviceFlags = 00000000
09:28:43.356.....DeviceString = Intel(R) UHD Graphics 750
09:28:43.356.....DeviceID = PCI\VEN_8086&DEV_4C8A&SUBSYS_09C51028&REV_04
09:28:43.356.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787C-7BC2-11EC-A9D8-806E6F6E6963}\0000
09:28:43.356...6.DeviceName = \\.\DISPLAY6
09:28:43.356.....DeviceFlags = 00000000
09:28:43.356.....DeviceString = Intel(R) UHD Graphics 750
09:28:43.356.....DeviceID = PCI\VEN_8086&DEV_4C8A&SUBSYS_09C51028&REV_04
09:28:43.356.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787C-7BC2-11EC-A9D8-806E6F6E6963}\0001
09:28:43.357...7.DeviceName = \\.\DISPLAY7
09:28:43.357.....DeviceFlags = 00000000
09:28:43.357.....DeviceString = Intel(R) UHD Graphics 750
09:28:43.357.....DeviceID = PCI\VEN_8086&DEV_4C8A&SUBSYS_09C51028&REV_04
09:28:43.357.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{B234787C-7BC2-11EC-A9D8-806E6F6E6963}\0002
09:28:43.357...Total number of monitors enumerated = 2
09:28:43.357...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\