DP1.4 硬件配置2lane无法上4K分辨率

Robotics & Edge Computing Jetson Systems Jetson Thor
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请教一下，就是我们当前硬件为 DP1.4 2Lane 配置（Thor T4000），从理论带宽来看，是可以满足4K@60Hz输出要求的；但目前实际外接测试只能识别到 1080P@60Hz，无法上到 4K 分辨率，麻烦帮忙看一下是什么原因；

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当前软件默认配置为4Lane，验证2Lane是硬件直接断开，保留Lane0/1

539794d0a9c78a6a2871e058fad9d5f7
539794d0a9c78a6a2871e058fad9d5f71920×1440 193 KB

789f32399809cc59f6b062a60aa57913
789f32399809cc59f6b062a60aa579131920×1440 83.7 KB

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display_20260519_uart.log (118.1 KB)

xrandr_verbose.log (3.9 KB)

display_dmesg.log (106.8 KB)

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image1231×418 194 KB

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image1231×418 194 KB

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Hi @liuhaojie1,

From the current attachments, we cannot confirm this is a DP 2-lane bandwidth or link-training issue yet. There are two items we need to clarify first:

  1. Please confirm the actual platform and BSP version

    The attached boot logs show t234 / NVIDIA Jetson AGX Orin Developer Kit, and the DTB/BIOS information points to JP6.2.2 / L4T R36.5 related software. This does not match the Thor T4000 platform mentioned in the topic.

    If the failing test is on Thor T4000, please provide logs from that same Thor device, including:

    cat /etc/nv_tegra_release
dmesg > dmesg.log

  2. Please retest with a confirmed 4K-capable DP monitor

    In the attached xrandr --verbose log, the EDID/mode list only advertises 1920x1080 and lower resolutions. There is no 3840x2160 mode listed, so the system will not expose 4K resolution from that EDID.

    Please connect a monitor that is confirmed to support 4K@60 over DP, then collect:

    export DISPLAY=:0
xrandr --verbose

Also, if the hardware keeps only Lane0/Lane1 while software is still using the default 4-lane display configuration, please confirm whether the Thor display/DCB configuration has been updated to match the actual 2-lane hardware design.

Recommendation:

Please first provide matching logs from the actual Thor T4000 test setup with a confirmed 4K-capable DP sink. If 3840x2160 is present in the EDID but still cannot be selected, then we can continue checking the DP lane/link configuration.

Official display configuration reference:

Hope this helps!