Two identical Samsung LU28R55 connected. Only one can be controlled.

I'm seeing both Samsung LU28R55 monitors in probe.log, but only one presents a control section. Both are connected through a cable (samsung provided) directly to a Plugable thunderbolt 3 breakout hub.

I spent some time searching for similar issues, but no luck. Any pointers? Is this a known situation?

``` JSON [Date: 5/24/2024 10:06:59 AM Ver: 4.6.14.0] { "System": "Manufacturer: Dell Inc., Model: XPS 9320, OS: 10.0.22631.0", "Device Context - DeviceItems": [ { "DeviceInstanceId": "DISPLAY\\SHP1551\\4&255e004d&0&UID8388688", "Description": "Dell XPS 9320 SHP1551 Display", "DisplayIndex": 1, "MonitorIndex": 0 }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID4165", "Description": "Generic PnP Monitor", "DisplayIndex": 2, "MonitorIndex": 0 }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID20550", "Description": "Generic PnP Monitor", "DisplayIndex": 3, "MonitorIndex": 0 } ], "DisplayMonitor - DisplayItems": [ { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID20550", "DisplayName": "LU28R55", "NativeResolution": { "_height": 2160, "_width": 3840 }, "PhysicalSize": { "_height": 14.173228263854981, "_width": 24.881889343261719 }, "PhysicalDiagonalLength": 28.6354465, "IsInternal": false, "ConnectionDescription": "DisplayPort" }, { "DeviceInstanceId": "DISPLAY\\SHP1551\\4&255e004d&0&UID8388688", "DisplayName": "", "NativeResolution": { "_height": 2400, "_width": 3840 }, "PhysicalSize": { "_height": 7.08661413192749, "_width": 11.338582992553711 }, "PhysicalDiagonalLength": 13.3709974, "IsInternal": true, "ConnectionDescription": "Internal" }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID4165", "DisplayName": "LU28R55", "NativeResolution": { "_height": 2160, "_width": 3840 }, "PhysicalSize": { "_height": 14.173228263854981, "_width": 24.881889343261719 }, "PhysicalDiagonalLength": 28.6354465, "IsInternal": false, "ConnectionDescription": "DisplayPort" } ], "Display Config - DisplayItems": [ { "DeviceInstanceId": "DISPLAY\\SHP1551\\4&255e004d&0&UID8388688", "DisplayName": "", "IsInternal": true, "RefreshRate": 59.9939232, "ConnectionDescription": "Internal", "IsAvailable": true }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID4165", "DisplayName": "LU28R55", "IsInternal": false, "RefreshRate": 59.996624, "ConnectionDescription": "DisplayPort", "IsAvailable": true }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255e004d&0&UID20550", "DisplayName": "LU28R55", "IsInternal": false, "RefreshRate": 59.996624, "ConnectionDescription": "DisplayPort", "IsAvailable": true } ], "Device Installation - InstalledItems": [ { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255E004D&0&UID20550", "Description": "Generic PnP Monitor", "IsRemovable": true }, { "DeviceInstanceId": "DISPLAY\\SHP1551\\4&255E004D&0&UID8388688", "Description": "Dell XPS 9320 SHP1551 Display", "IsRemovable": false }, { "DeviceInstanceId": "DISPLAY\\SAM1015\\4&255E004D&0&UID4165", "Description": "Generic PnP Monitor", "IsRemovable": true } ], "Monitor Configuration - PhysicalItems": [ { "Key": { "DisplayIndex": 1, "MonitorRect": "Location:0,0, Size:3840,2400" }, "Value": [ { "Description": "Dell XPS 9320 SHP1551 Display", "MonitorIndex": 0, "Capability": { "IsHighLevelBrightnessSupported": false, "IsLowLevelBrightnessSupported": false, "IsContrastSupported": false, "IsPrecleared": false, "CapabilitiesString": null, "CapabilitiesReport": null, "CapabilitiesData": null }, "GetBrightness": "Success: False", "SetBrightness": "Success: False" } ] }, { "Key": { "DisplayIndex": 2, "MonitorRect": "Location:-1811,-2160, Size:3840,2160" }, "Value": [ { "Description": "Generic PnP Monitor", "MonitorIndex": 0, "Capability": { "IsHighLevelBrightnessSupported": false, "IsLowLevelBrightnessSupported": false, "IsContrastSupported": false, "IsPrecleared": false, "CapabilitiesString": null, "CapabilitiesReport": null, "CapabilitiesData": null }, "GetBrightness": "Success: True, Valid: True (Minimum: 0, Current: 100, Maximum: 100)", "SetBrightness": "Success: True, Match: True (Expected: 93, Actual: 93)" } ] }, { "Key": { "DisplayIndex": 3, "MonitorRect": "Location:2029,-2160, Size:3840,2160" }, "Value": [ { "Description": "Generic PnP Monitor", "MonitorIndex": 0, "Capability": { "IsHighLevelBrightnessSupported": false, "IsLowLevelBrightnessSupported": true, "IsContrastSupported": true, "IsPrecleared": false, "CapabilitiesString": "(prot(monitor)type(lcd)model(FALCON)cmds(01 02 03 07 0C 4E F3 E3)vcp(02 04 05 08 0B 0C 10 12 14(01 04 05 06 07 08 0A 0B) 16 18 1A 6C 6E 70 AC AE B6 C0 C6 C8 C9 CA CC(00 02 03 04 05 08 09 0A 0D) D6(01 04) DC(00 01 02 03 04) DF 60(01 03) 62 8D FF)mswhql(1)mccs_ver(2.0)asset_eep(32)mpu_ver(01))", "CapabilitiesReport": "Luminance: True, Contrast: True, Temperature: True, Input Source: True, Speaker Volume: True, Power Mode: True", "CapabilitiesData": null }, "GetBrightness": "Success: True, Valid: True (Minimum: 0, Current: 100, Maximum: 100)", "SetBrightness": "Success: True, Match: True (Expected: 94, Actual: 94)" } ] } ], "MSMonitorClass - DesktopItems": [ { "DeviceInstanceId": "DISPLAY\\SHP1551\\4&255E004D&0&UID8388688", "Description": "Dell XPS 9320 SHP1551 Display", "BrightnessLevels": "0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100" } ], "ElapsedTime": [ "DeviceItems -> 0.016", "DisplayMonitorItems -> 0.017", "DisplayConfigItems -> 0.016", "InstalledItems -> 0.030", "PhysicalItems -> 4.760", "DesktopItems -> 0.049" ] } ```

emoacht / Monitorian

Two identical Samsung LU28R55 connected. Only one can be controlled. #595