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SN65DP159: SN65DP159 HDMI black screen issue on Windows

İsrafil Ahmet Güler
Prodigy 10 points

Part Number: SN65DP159

Hi TI Support Team,

We are using the SN65DP159 on a custom COM Express Type-6 carrier board to provide an HDMI output.

Under Linux, the HDMI output works correctly at 1920×1080 resolution.
However, under Windows 10, when the Intel graphics driver (31.x) is installed, the HDMI output does not work.

What we see:

  • In Windows Safe Mode or when using the Microsoft Basic Display Adapter, video output works.

  • When the Intel graphics driver is active, windows does not detect any physical HDMI monitor. Only a virtual display (for example, TeamViewer virtual monitor) is shown.

  • Booting Windows with the HDMI cable disconnected does not change the behavior.

  • We bypassed the ferrite beads on the DDC lines for testing, but there was no change.

Questions:

  1. Have you seen cases where HDMI works on Linux but fails on Windows when using SN65DP159?

  2. During HDMI initialization, does the Intel Windows graphics driver expect any specific behavior from the redriver that differs from Linux drivers?

  3. Can SN65DP159 load or bias the TMDS lines in a way that may cause the GPU HDMI initialization to fail, even without a monitor connected?

  4. Can an incorrect TMDS lane order or polarity cause some operating systems to fail completely?

  5. Is there any recommended enable or power-up sequence for SN65DP159 that could affect HDMI initialization?

  6. For debugging, do you recommend bypassing the SN65DP159 to confirm whether it is the root cause?

We would like to know how to continue.

Best regards,
Ahmet

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  • 0
    TI__Mastermind 23141 points

    Hi Ahmet,

    DP159 is just a signal conditioner and cannot be impacted by different driver or OS. Because the display comes out in Linux and in Windows basic driver, I suggest to contact Intel for driver support as it does not seem there are any HW issues that relate to our device.

    Best,

    J