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kfix / ddcctl

DDC monitor controls (brightness) for Mac OSX command line
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Dell U2412M Unable to Switch Back From Source 3 to 15 #103

Open pranavanmaru opened 3 years ago

pranavanmaru commented 3 years ago

Pre-Conditions:

  1. Dell U2412M is Display 2
  2. Display 2 Connected via Display Port (15) to a Macbook Pro
  3. Display 2 Connected via DVI Port (3) to a PC
  4. Display 2 Currently Active on Mac (via 15).

Reproduction Steps:

  1. Run ddcctl -d 2 -i 3 on Mac to Switch Display 2 over to DVI Port.
    • Monitor switches input source as expected.
  2. Run ddcctl -d 2 -i 15 on Mac to Switch Display 2 back over to Display Port.
    • Expected: Monitor switches input source to display port
    • Actual: No change observed. Monitor remained active with DVI Port (Input Source 3)

Logs

ddcctl -d 2 -i 3
D: CGDisplay FD7794D8-FEB4-3C97-894E-A41FAD6C76FE dispID(#722484499) (2560x1440 0°) HiDPI
D: CGDisplay D039A244-01A3-A446-3225-76AF1E2F22F9 dispID(#724061848) (1920x1200 0°) 94.00 DPI
I: found 2 external displays
I: polling EDID for #2 (ID 724061848 => IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/GFX0@0/ATY,Longavi@2/AMDFramebufferVIB)
I: got edid.serial: 7WFG151G0BPS
I: got edid.name: DELL U2412M
D: action: i: 3
D: setting VCP control #96 => 3
itxch commented 3 years ago

What is the output when running ddcctl -d 2 -i 15 Also, try ddcctl -d 2 -i 16

kfix commented 3 years ago

I think the Input Values that were contributed to the README are more what you'd call guidelines than actual rules. Seconding @itxchh 's suggestion to try some other numbers (but at your own risk). Welcome to ddcctl 🏴‍☠️!