Raspberry Pi 5 Display Issue with 120mm HDMI Cable

• simonk

  Posts: 1

  Joined: 2025-03-01 9:37

  2025-03-01 9:58

  Hi everyone,
  
  I'm facing a strange issue with my Raspberry Pi 5 and a 10.1" HD touchscreen display. When using a standard HDMI cable, everything works flawlessly. However, when I switch to a 120mm HDMI cable, the connection appears to be active, but the screen remains blank.
  
  OS / uname -a: Linux raspberrypi 6.6.74+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.74-1+rpt1 (2025-01-27) aarch64 GNU/Linux
  
  What I’ve Tried So Far:
  I added the following parameter to cmdline.txt:

  Code: Select all

  video=HDMI-A-2:1024x600M@60

  To check if the monitor is detected, I ran kmsprint, which returned:
  

  Code: Select all

  Connector 0 (32) HDMI-A-1 (disconnected)
    Encoder 0 (31) TMDS
  Connector 1 (42) HDMI-A-2 (connected)
    Encoder 1 (41) TMDS
      Crtc 3 (105) 1024x600@59.82 50.250 1024/44/88/188/- 600/3/6/16/+ 60 (59.82) P|U|D
        Plane 3 (94) fb-id: 683 (crtcs: 3) 0,0 1024x600 -> 0,0 1024x600 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
          FB 683 1024x600 XR24
        Plane 55 (667) fb-id: 684 (crtcs: 3) 0,0 64x64 -> 98,98 64x64 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
          FB 684 64x64 AR24

  It looks like the display is being recognized, but no image is showing. Previously, the following settings from this manual (https://wiki.luckfox.com/Display/10.1in ... uchscreen/) worked:

  Code: Select all

  hdmi_group=2
  hdmi_mode=87
  hdmi_cvt 1024 600 60 6 0 0 0

  However, they no longer seem to have any effect.
  
  The Big Question:
  Why does the display work perfectly with a standard HDMI cable, but not with the 120mm HDMI cable? Could it be a signal integrity issue, power limitation, or something else?
  
  Any insights would be greatly appreciated!
  
  Thanks in advance!

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