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

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

[bugzilla-daemon]

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

            Bug ID: 217674
           Summary: Thunderbolt dock does not recognize displays connected
                    via DP->HDMI cable
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: planetmarshalluk@gmail.com
        Regression: No

Created attachment 304641
  --> https://bugzilla.kernel.org/attachment.cgi?id=304641&action=edit
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.

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

[bugzilla-daemon]

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

--- Comment #1 from Andew Marshall (planetmarshalluk@gmail.com) ---
Created attachment 304642
  --> https://bugzilla.kernel.org/attachment.cgi?id=304642&action=edit
journalctl --dmesg output

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

[bugzilla-daemon]

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

--- Comment #2 from Andew Marshall (planetmarshalluk@gmail.com) ---
Created attachment 304643
  --> https://bugzilla.kernel.org/attachment.cgi?id=304643&action=edit
kernel config

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

[bugzilla-daemon]

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

Bagas Sanjaya (bagasdotme@gmail.com) changed:

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

[bugzilla-daemon]

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

--- Comment #4 from Andew Marshall (planetmarshalluk@gmail.com) ---
(In reply to Bagas Sanjaya from comment #3)

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

I tried v6.1 and I get the same issue, although there are no drm errors in the
log. Just the one message:

```
[  214.332514] [drm] DMUB HPD callback: link_index=2
```

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

[bugzilla-daemon]

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

Mario Limonciello (AMD) (mario.limonciello@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mario.limonciello@amd.com

--- Comment #5 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
This is very likely a GPU driver or GPU microcode bug.  Can you please bring
the issue to https://gitlab.freedesktop.org/drm/amd/-/issues

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