[Bug 217674] Thunderbolt dock does not recognize displays connected via DP->HDMI cable

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217674

Bagas Sanjaya (bagasdotme@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |bagasdotme@gmail.com

--- Comment #3 from Bagas Sanjaya (bagasdotme@gmail.com) ---
(In reply to Andew Marshall from comment #0)
> Created attachment 304641 [details]
> lspci -v output
> 
> Summary
> -------
> 
> When using a thunderbolt dock with 2x DisplayPort connectors, the displayys
> are not recognized when connected with DP->HDMI cables. Connecting over
> DP->DP cables work as expected.
> 
> Expected Behaviour
> ------------------
> 
> Displays connected to the dock via DP->HDMI cables should be recognized.
> 
> Actual Behaviour
> ----------------
> 
> Displays connected to the dock via DP->HDMI cables are not recognized. The
> following messages are reported in `dmesg`
> 
> ```
> [68022.156971] thunderbolt 0-2: new device found, vendor=0x6f device=0x12
> [68022.156977] thunderbolt 0-2: StarTech.com TB3CDK2DP
> ...various USB connection messages...
> [68139.834086] [drm] DMUB HPD callback: link_index=2
> [68139.834859] [drm] DPIA AUX failed on 0x0(1), error 3
> [68139.836167] [drm] DPIA AUX failed on 0x0(1), error 3
> (etc)
> ```
> USB ports and network connection functions as expected.
> 
> 
> Steps to Reproduce
> ------------------
> 
> Laptop used is Asus G14 (2023) model GA402NV
> Dock is Startech TB3CDK2DP
> Reproduced on Linux Kernel 6.4.3 from stable repo
> 
> 1. Connect laptop to dock over USB-C
> 2. Connect an external display with DP->HDMI cable
> 3. Open appropriate display settings to see if external display is
> recognized.

Do you have this issue on v6.1 stable series?

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