‎Linux, U2520D, U2515H, daisy chain, issue with DDC/CI

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kgizdov

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5 years ago

kgizdov

12 Posts

1637

June 11th, 2020 10:00

Linux, U2520D, U2515H, daisy chain, issue with DDC/CI

Hi,

I have two monitors:
- main: U2520D (DP 1.4 into NVidia GeForce 1070 Ti)
- chained: U2515H (DP 1.2 into U2520D DP-out)

I want to use DDC/CI to control my brightness on both monitors. However, so far I can only do it on the main monitor. This is to mean that if I set the brightness it only changes on the main monitor which is directly connected to the GPU and the monitor that is daisy chained remains unaffected. I've tested them individually and if each one is directly connected to the GPU, then setting the brightness works. But it doesn't when daisy chaining. Does anyone know if this is possible? And if so, how? If not, what are my alternatives - I would like to minimize the number of cables going to the PC.

DC
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Posted June 11th, 2020 11:00
Thank you! We have received the required details. We will work towards a resolution via private messages to ensure the security of your information. In the meanwhile, you may receive assistance or suggestions from the community members as well.

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swamped207
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426 Posts
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Posted June 11th, 2020 12:00
Yes it definitely is possible; I have a P24 chained to a U2520, although it is driven by Intel gfx rather than NVidia. While holding down the SHIFT key, right-click on the DDM system tray icon and select "Save diagnostic report" from the popup menu; then post the report here. It should show where the issue lies.
K
kgizdov
12 Posts
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Posted June 11th, 2020 13:00
I cannot do that because I am not using DDM not Windows. I am on Linux.
K
kgizdov
12 Posts
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Posted June 11th, 2020 14:00
Actually, I connected a different PC with Windows on and installed DDM - it works fine for both monitors like that. Unfortunately, that probably means either the NVIDIA driver for Linux is bad or the i2c interface tools on Linux cannot do it correctly.... it's a shame
K
kgizdov
12 Posts
1268
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Posted June 11th, 2020 14:00
Diagnostic Report, generated 12/06/2020 (10.0.18363)
Copyright (c) 1995-2020, EnTech Taiwan.
Version = 1.50.0.1996
OS = 10.0.18363.2 x64
Mechanism = 3
Account = Standard
Command line = "C:\Program Files (x86)\Dell\Dell Display Manager\ddm.exe" ExpandConstant
////////////////////////////////////////
PCa.DELA14E.7K8NGZ2 = 0x0000000F
PCb.DELA14E.7K8NGZ2 = 0x00000011
PC2.DELA14E.7K8NGZ2 = 0x00000011
LastCheck = 0x0000ABDA
HintShown = 0x00000001
AutoRestoreWindowLayout = 0x00000000
GlassBorder.DELA14E.7K8NGZ2 = 0x00000100
AppScan.DELD06F.9X2VY563088L = 0x00000004
AppScan.DELA14E.7K8NGZ2 = 0x00000004
DELD06F = 0x00000001
FW.DELD06F.9X2VY563088L = 0x00000100
DELA14E = 0x00000001
FW.DELA14E.7K8NGZ2 = 0x00004101
EnumErrorCount = 0x00000000
Metro.DELD06F.9X2VY563088L = 0x00000001
D3D.DELD06F.9X2VY563088L = 0x00000004
Metro.DELA14E.7K8NGZ2 = 0x0000000B
D3D.DELA14E.7K8NGZ2 = 0x00000004
DELD06F.9X2VY563088L\C:\Program Files (x86)\Dell\Dell Display Manager\ddm.d3d = 0x00000004
DELD06F.9X2VY563088L\C:\Program Files (x86)\Microsoft Office\Root\Office16\OUTLOOK.EXE = 0x00000000
DELD06F.9X2VY563088L\C:\Program Files (x86)\Microsoft Office\Root\Office16\WINWORD.EXE = 0x00000000
DELD06F.9X2VY563088L\C:\Program Files (x86)\Microsoft Office\Root\Office16\POWERPNT.EXE = 0x00000001
DELD06F.9X2VY563088L\C:\Program Files (x86)\Microsoft Office\Root\Office16\EXCEL.EXE = 0x00000000
DELD06F.9X2VY563088L\C:\Program Files\Windows NT\Accessories\WORDPAD.EXE = 0x00000000
DELD06F.9X2VY563088L\C:\WINDOWS\system32\mspaint.exe = 0x00000001
DELD06F.9X2VY563088L\C:\Program Files (x86)\Windows Media Player\wmplayer.exe = 0x00000002
DELD06F.9X2VY563088L\C:\Program Files\Internet Explorer\IEXPLORE.EXE = 0x00000001
DELD06F.9X2VY563088L\C:\WINDOWS\SysNative\ApplicationFrameHost.exe*Microsoft Edge = 0x00000001
DELD06F.9X2VY563088L\C:\WINDOWS\SysNative\ApplicationFrameHost.exe = 0x00000001
DELD06F.9X2VY563088L\C:\Program Files (x86)\Dell\Dell Display Manager\ddm.exe = 0x00000000
DELA14E.7K8NGZ2\C:\Program Files (x86)\Dell\Dell Display Manager\ddm.exe = 0x00000000
DELA14E.7K8NGZ2\C:\Program Files (x86)\Dell\Dell Display Manager\ddm.d3d = 0x00000004
DELA14E.7K8NGZ2\C:\Program Files (x86)\Microsoft Office\Root\Office16\OUTLOOK.EXE = 0x00000000
DELA14E.7K8NGZ2\C:\Program Files (x86)\Microsoft Office\Root\Office16\WINWORD.EXE = 0x00000000
DELA14E.7K8NGZ2\C:\Program Files (x86)\Microsoft Office\Root\Office16\POWERPNT.EXE = 0x0000000B
DELA14E.7K8NGZ2\C:\Program Files (x86)\Microsoft Office\Root\Office16\EXCEL.EXE = 0x00000000
DELA14E.7K8NGZ2\C:\Program Files\Windows NT\Accessories\WORDPAD.EXE = 0x00000000
DELA14E.7K8NGZ2\C:\WINDOWS\system32\mspaint.exe = 0x0000000B
DELA14E.7K8NGZ2\C:\Program Files (x86)\Windows Media Player\wmplayer.exe = 0x00000002
DELA14E.7K8NGZ2\C:\Program Files\Internet Explorer\IEXPLORE.EXE = 0x0000000B
DELA14E.7K8NGZ2\C:\WINDOWS\SysNative\ApplicationFrameHost.exe*Microsoft Edge = 0x0000000B
DELA14E.7K8NGZ2\C:\WINDOWS\SysNative\ApplicationFrameHost.exe = 0x0000000B
////////////////////////////////////////
00:31:19.204...Log opened
00:31:19.207...WinOS = 18363
00:31:19.241...LanguageID = 00000809 00000809 00000809
00:31:19.247...Build = 1.50.0.1996
00:31:19.247...Windows handles = 00020124 000100A8 00010128
00:31:19.248...OS monitor sleep timeout value = 600 ms.
00:31:19.248...Applied DPI = 96-120
00:31:19.249...VM = 0
00:31:19.249...Registered DDM popup hotkey = Shift+Ctrl+D 6044
00:31:19.249...Registered EA layout MRU hotkey = Shift+Ctrl+Home 6024
00:31:19.250...Registered application window hotkey = Shift+Ctrl+Ins 602D
00:31:19.252...Remote asset management = 1
00:31:19.252...Remote registry service state = 4
00:31:19.300...WMI service state (unless firewalled) = 1
00:31:20.752...Starting enumeration
00:31:20.824......U2520 notified of pending communication
00:31:21.164...1. DELA14E.7K8NGZ2 on NVIDIA GeForce GTX 1070 Ti
00:31:21.164......Monitor assignment = 1
00:31:21.165......Adapter name = \\.\DISPLAY1
00:31:21.166......Monitor name = Generic PnP Monitor
00:31:21.166......Vendor ID = 10DE
00:31:21.168......GPU driver = c:\windows\system32\driverstore\filerepository\nvmdsi 26.21.14.4292
00:31:21.169......Flags = 00080005.00000003
00:31:21.169......Display tag = 2E56A54E
00:31:21.170......Monitor handle = 00010001
00:31:21.171......Monitor screen area = 0,0 x 2560,1440 2560x1440
00:31:21.171......Monitor work area = 0,0 x 2560,1400 2560x1400
00:31:21.172......Monitor scaling factor = 100%
00:31:21.172......Raw EDID = 00FFFFFFFFFFFF0010AC4EA14C344B30041E0104A5371F783E5095AF4F45A9260F5054A54B00714F8180A9C0A940D1C0E100D1000101565E00A0A0A029503020350029372100001A000000FF00374B384E475A320A2020202020000000FC0044454C4C205532353230440A20000000FD00304B0A7828010A202020202020012E
00:31:21.268......VCP10 = 0064000A
00:31:21.270......OS device handle = 00010001.00000000
00:31:21.271......Capabilities string = (prot(monitor)type(lcd)model(u2520d)cmds(01 02 03 07 0c e3 f3)vcp(02 04 05 08 10 12 14(01 04 05 06 08 09 0b 0c) 16 18 1a 52 60(1b 0f 11 ) aa(01 02 04 ) ac ae b2 b6 c6 c8 c9 ca cc(02 0a 03 04 08 09 0d 06 ) d6(01 04 05) dc(00 03 05 ) df e0 e1 e2(00 1d 02 04 0c 0d 0f 10 11 13 0b 1b 14 27 23 24 3a ) ea(fe00 fe01 fc01 fc02 ) f0(0a 0c 31 32 34 36 ) f1 f2 fd)mswhql(1)asset_eep(40)mccs_ver(2.1)) (cached)
00:31:21.620......Configuration = FFFF000B.FF0062.1E04
00:31:21.643......Model = Dell U2520D
00:31:21.670......Model year = FY20
00:31:21.698......Capabilities = (prot(monitor)type(lcd)model(u2520d)cmds(01 02 03 07 0c e3 f3)vcp(02 04 05 08 10 12 14(01 04 05 06 08 09 0b 0c) 16 18 1a 52 60(1b 0f 11 ) aa(01 02 04 ) ac ae b2 b6 c6 c8 c9 ca cc(02 0a 03 04 08 09 0d 06 ) d6(01 04 05) dc(00 03 05 ) df e0 e1 e2(00 1d 02 04 0c 0d 0f 10 11 13 0b 1b 14 27 23 24 3a ) ea(fe00 fe01 fc01 fc02 ) f0(0a 0c 31 32 34 36 ) f1 f2 fd)mswhql(1)asset_eep(40)mccs_ver(2.1)) (cached)
00:31:21.701......Opcodes supported = 02,04,05,08,10,12,14,16,18,1A,52,60,AA,AC,AE,B2,B6,C6,C8,C9,CA,CC,D6,DC,DF,E0,E1,E2,EA,F0,F1,F2,FD
00:31:21.842......Timing = 88.80 kHz (-), 60.00 Hz (-)
00:31:21.843......Status = 0140001D
00:31:21.854...2. DELD06F.9X2VY563088L on NVIDIA GeForce GTX 1070 Ti
00:31:21.855......Monitor assignment = 2
00:31:21.856......Adapter name = \\.\DISPLAY2
00:31:21.856......Monitor name = Generic PnP Monitor
00:31:21.857......Vendor ID = 10DE
00:31:21.859......GPU driver = c:\windows\system32\driverstore\filerepository\nvmdsi 26.21.14.4292
00:31:21.860......Flags = 00080001.00000003
00:31:21.860......Display tag = BF56A56E
00:31:21.861......Monitor handle = 00010003
00:31:21.862......Monitor screen area = -2560,0 x 0,1440 2560x1440
00:31:21.863......Monitor work area = -2560,0 x 0,1400 2560x1400
00:31:21.863......Monitor scaling factor = 100%
00:31:21.864......Raw EDID = 00FFFFFFFFFFFF0010AC6FD04C38383017190104A5371F783E4455A9554D9D260F5054A54B00B300D100714FA9408180778001010101565E00A0A0A029503020350029372100001A000000FF0039583256593536333038384C0A000000FC0044454C4C205532353135480A20000000FD0038561E711E010A20202020202001BF
00:31:22.035......VCP10 = 0064000A
00:31:22.036......OS device handle = 00010003.00000000
00:31:22.038......Capabilities string = (prot(monitor)type(lcd)model(u2515h)cmds(01 02 03 07 0c e3 f3)vcp(02 04 05 08 10 12 14(04 0b 05 06 08 09 0c) 16 18 1a 52 60(0f 10 11 12) aa(01 02 04) ac ae b2 b6 c6 c8 c9 d6(01 04 05) dc(00 02 03 05) df e0 e1 e2(00 01 02 04 14 19 0c 0d 0f 10 11 13) f0(00 08) f1(01 02) f2 fd)mswhql(1)asset_eep(40)mccs_ver(2.1)) (cached)
00:31:22.570......Configuration = FF0003.FF0063.1917
00:31:22.571......Model = Dell U2515H
00:31:22.571......Model year = FY15
00:31:22.571......Capabilities = (prot(monitor)type(lcd)model(u2515h)cmds(01 02 03 07 0c e3 f3)vcp(02 04 05 08 10 12 14(04 0b 05 06 08 09 0c) 16 18 1a 52 60(0f 10 11 12) aa(01 02 04) ac ae b2 b6 c6 c8 c9 d6(01 04 05) dc(00 02 03 05) df e0 e1 e2(00 01 02 04 14 19 0c 0d 0f 10 11 13) f0(00 08) f1(01 02) f2 fd)mswhql(1)asset_eep(40)mccs_ver(2.1)) (cached)
00:31:22.572......Opcodes supported = 02,04,05,08,10,12,14,16,18,1A,52,60,AA,AC,AE,B2,B6,C6,C8,C9,D6,DC,DF,E0,E1,E2,F0,F1,F2,FD
00:31:22.786......Timing = 89.10 kHz (-), 60.10 Hz (-)
00:31:22.787......Status = 0040000D
00:31:22.788...Ending enumeration
00:31:22.804...New=DELA14E.0000 DELD06F.0002
00:31:22.964...Creating VCP table on DELD06F.9X2VY563088L
00:31:23.134......Opcode 0x12 = 0064004B
00:31:23.342......Opcode 0x60 = 00120010
00:31:23.566......Opcode 0xAA = 00FF0001
00:31:23.811......Opcode 0xC8 = 00111109
00:31:24.037......Opcode 0xE2 = 00190000
00:31:24.090...Creating VCP table on DELA14E.7K8NGZ2
00:31:24.186......Opcode 0x12 = 0064004B
00:31:24.320......Opcode 0x60 = 12120F0F
00:31:24.451......Opcode 0xAA = 00040001
00:31:24.582......Opcode 0xC8 = 00271709
00:31:24.713......Opcode 0xE2 = 00FF0000
00:31:25.579...Video power down timeout = 600
00:31:25.584...User session connect
00:31:25.589...Display powered ON
00:31:25.603...Auto-saving window layout...
00:31:37.012...Refreshing Dell U2520D on NVIDIA GeForce GTX 1070 Ti
00:33:02.238...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
00:33:02.238...Dump: complete Windows device enumeration
00:33:02.238...1.DeviceName = \\.\DISPLAY1
00:33:02.239.....DeviceFlags = 00080005
00:33:02.239.....DeviceString = NVIDIA GeForce GTX 1070 Ti
00:33:02.239.....DeviceID = PCI\VEN_10DE&DEV_1B82&SUBSYS_C3071462&REV_A1
00:33:02.239.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{D346B863-87E4-11EA-9D35-001A7DDA7104}\0000
00:33:02.241.....a.MonitorName = \\.\DISPLAY1\Monitor0
00:33:02.242.......MonitorFlags = 00000003
00:33:02.242.......MonitorString = Generic PnP Monitor
00:33:02.242.......MonitorID = MONITOR\DELA14E\{4d36e96e-e325-11ce-bfc1-08002be10318}\0000
00:33:02.242.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0000
00:33:02.243.......Raw EDID = 00FFFFFFFFFFFF0010AC4EA14C344B30041E0104A5371F783E5095AF4F45A9260F5054A54B00714F8180A9C0A940D1C0E100D1000101565E00A0A0A029503020350029372100001A000000FF00374B384E475A320A2020202020000000FC0044454C4C205532353230440A20000000FD00304B0A7828010A202020202020012E
00:33:02.245...2.DeviceName = \\.\DISPLAY2
00:33:02.245.....DeviceFlags = 00080001
00:33:02.245.....DeviceString = NVIDIA GeForce GTX 1070 Ti
00:33:02.245.....DeviceID = PCI\VEN_10DE&DEV_1B82&SUBSYS_C3071462&REV_A1
00:33:02.246.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{D346B863-87E4-11EA-9D35-001A7DDA7104}\0001
00:33:02.248.....a.MonitorName = \\.\DISPLAY2\Monitor0
00:33:02.248.......MonitorFlags = 00000003
00:33:02.248.......MonitorString = Generic PnP Monitor
00:33:02.249.......MonitorID = MONITOR\DELD06F\{4d36e96e-e325-11ce-bfc1-08002be10318}\0002
00:33:02.249.......MonitorKey = \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0002
00:33:02.249.......Raw EDID = 00FFFFFFFFFFFF0010AC6FD04C38383017190104A5371F783E4455A9554D9D260F5054A54B00B300D100714FA9408180778001010101565E00A0A0A029503020350029372100001A000000FF0039583256593536333038384C0A000000FC0044454C4C205532353135480A20000000FD0038561E711E010A20202020202001BF
00:33:02.251...3.DeviceName = \\.\DISPLAY3
00:33:02.252.....DeviceFlags = 00080000
00:33:02.252.....DeviceString = NVIDIA GeForce GTX 1070 Ti
00:33:02.252.....DeviceID = PCI\VEN_10DE&DEV_1B82&SUBSYS_C3071462&REV_A1
00:33:02.252.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{D346B863-87E4-11EA-9D35-001A7DDA7104}\0002
00:33:02.254...4.DeviceName = \\.\DISPLAY4
00:33:02.255.....DeviceFlags = 00080000
00:33:02.255.....DeviceString = NVIDIA GeForce GTX 1070 Ti
00:33:02.255.....DeviceID = PCI\VEN_10DE&DEV_1B82&SUBSYS_C3071462&REV_A1
00:33:02.255.....DeviceKey = \Registry\Machine\System\CurrentControlSet\Control\Video\{D346B863-87E4-11EA-9D35-001A7DDA7104}\0003
00:33:02.257...Total number of monitors enumerated = 2
00:33:02.258...\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
00:33:02.258...Dumping VCP table on DELD06F.9X2VY563088L
00:33:02.417......Opcode 0x02 = 00020002
00:33:02.622......Opcode 0x10 = 0064000A
00:33:02.829......Opcode 0x12 = 0064004B
00:33:03.032......Opcode 0x14 = 000C0005
00:33:03.235......Opcode 0x16 = 00640064
00:33:03.440......Opcode 0x18 = 00640064
00:33:03.648......Opcode 0x1A = 00640064
00:33:03.852......Opcode 0x52 = 00FF00F2
00:33:04.076......Opcode 0x60 = 00120010
00:33:04.282......Opcode 0xAA = 00FF0001
00:33:04.501......Opcode 0xAC = 00015C0C
00:33:04.707......Opcode 0xAE = FFFF177A
00:33:04.909......Opcode 0xB2 = 00010001
00:33:05.116......Opcode 0xB6 = 00050003
00:33:05.321......Opcode 0xC6 = FFFF45CC
00:33:05.526......Opcode 0xC8 = 00111109
00:33:05.753......Opcode 0xC9 = FFFF0100
00:33:05.958......Opcode 0xD6 = 00050001
00:33:06.162......Opcode 0xDC = 00050000
00:33:06.368......Opcode 0xDF = FFFF0201
00:33:06.572......Opcode 0xE2 = 00190000
00:33:06.779......Opcode 0xF0 = 00FF0000
00:33:06.999......Opcode 0xF1 = 00FF0003
00:33:07.204......Opcode 0xF2 = 00FF0000
00:33:07.410......Opcode 0xFD = 00FF0063
00:33:07.462......VCP table dumped
00:33:07.472...Dumping VCP table on DELA14E.7K8NGZ2
00:33:07.579......Opcode 0x02 = 00FF0001
00:33:07.710......Opcode 0x10 = 0064000A
00:33:07.840......Opcode 0x12 = 0064004B
00:33:07.972......Opcode 0x14 = 0064004B
00:33:08.123......Opcode 0x16 = 00640064
00:33:08.256......Opcode 0x18 = 00640064
00:33:08.386......Opcode 0x1A = 00640064
00:33:08.518......Opcode 0x52 = 00FF0010
00:33:08.650......Opcode 0x60 = 12120F0F
00:33:08.781......Opcode 0xAA = 00040001
00:33:08.928......Opcode 0xAC = 00015AE0
00:33:09.062......Opcode 0xAE = FFFF1770
00:33:09.192......Opcode 0xB2 = 00010001
00:33:09.324......Opcode 0xB6 = 00050003
00:33:09.476......Opcode 0xC6 = FFFF45CC
00:33:09.627......Opcode 0xC8 = 00271709
00:33:09.759......Opcode 0xC9 = FFFF4101
00:33:09.889......Opcode 0xCA = 00020002
00:33:10.021......Opcode 0xCC = 000D0002
00:33:10.169......Opcode 0xD6 = 00050003
00:33:10.299......Opcode 0xDC = 00050000
00:33:10.429......Opcode 0xDF = FFFF0201
00:33:10.579......Opcode 0xE2 = 00FF0000
00:33:10.727......Opcode 0xEA = FFFFFC02
00:33:10.859......Opcode 0xF0 = 00FF0000
00:33:10.989......Opcode 0xF1 = FFFF000B
00:33:11.121......Opcode 0xF2 = 00FF0000
00:33:11.253......Opcode 0xFD = 00FF0062
00:33:11.310......VCP table dumped
P
pneves
2 Posts
755
0
Posted February 27th, 2022 12:00
It works since kernel 5.10

https://gitlab.freedesktop.org/drm/intel/-/issues/37

Linux, U2520D, U2515H, daisy chain, issue with DDC/CI

Dell Support Resources

Latest Solutions

Dell Inspiron 15 5000 Series

Which port on the Alienware X14 R1 RTX 3060 allows direct connection of the NVIDIA graphic card to a monitor?

System Configuration

xps 8900 will not boot and Epsa Successful

[GUIDE / FIX] Solved: Dell G15 5511 High Battery Drain (28W–35W -> 11W–13W) & RTX dGPU Stuck in D0 State (6–7+ Hours Battery Life)