Re: TB 5 Dock DP-Out non-functional

[Mika Westerberg <mika.westerberg@linux.intel.com>]

Hi,

On Mon, Nov 03, 2025 at 12:01:06PM +0100, Frederik Schwan wrote:
> Whole log attached.

Great, thanks!

From that log the last BW allocation done by i915 is 12.5G:

[   51.572497] thunderbolt 0000:8a:00.0: 0:13 <-> 1:12 (DP): bandwidth allocation changed to 0/12500 Mb/s

> > Regarding the script, that's odd too but it could be that you have more
> > than one host router there (it is not clear from the truncated log). You
> > need to build the tbtools binaries though.
> 
> I do package tbtools for Arch so these are available.
> 
> tblist gives me:
> Domain 0 Route 0: 8087:7eb2 Intel Gen14
> Domain 1 Route 0: 17ef:a583 Lenovo ThinkPad P1 Gen8 / T1g Gen8
> Domain 1 Route 1: 0108:234d Lenovo ThinkPad Thunderbolt 5 Smart Dock 7500 - 40BA

Okay this has discrete Barlow Ridge TB5 host router.

> tbadapters --domain 1 --route 1:
>  1: Lane 0 (upstream)             CL0
>  2: Lane 1                        CL0
>  3: Lane 0                        CLd
>  4: Lane 1                        CLd
>  5: Lane 0                        CLd
>  6: Lane 1                        CLd
>  7: Lane 0                        CLd
>  8: Lane 1                        CLd
>  9: PCIe Up                       L1
> 10: PCIe Down                     Disabled
> 11: DisplayPort OUT               Disabled
> 12: DisplayPort OUT               Enabled

And this confirms that the DP tunnel is up.

That tb-bandwidth.sh script should work too (or tbtunnels -d1 -vv).

Anyways, from TB perspective this looks okay. Not sure about graphics. Imre
do you see anything?