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Update Docked mode authored by Chris Vogel's avatar Chris Vogel
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Troubleshooting/Docked-mode.md
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......@@ -209,8 +209,12 @@ In some cases you might find output like the following in your `sudo dmesg`:
That means: PD contract was successfully negotiated, DP alt-mode was negotiated, the imx8mq's DP core is up and running, DP Aux communication works (via the SBU lanes on the USB-C plug, so muxing works as well) but the calibration of the actual data lanes (which are muxed on the TX/RX pairs of the USB-C plug) failed.
## Check TX/RX line pairs
This can be a cable issue, a problem with the attached monitor/dock or though unlikely a hw problem with the L5. You can check the TX/RX line pairs by testing some USB-3 devices as they use those as well.
## Check Display Port Firmware Version
If it is not a hardware problem it could also be an outdated u-boot software as the the DP firmware contained therein is responsible for the link training and early firmwares where pretty bad at that.
You can find the firmware version for your Display Port using the following command:
......@@ -270,7 +274,12 @@ purism@pureos:~/docked_mode$ diff lsusb_undocked.txt lsusb_docked-no-monitor.txt
In this case you'd report the vendor:product number of "USB C Video Adaptor" "25a4:9311" along with your findings and experiences for including into the list of [tested hardware](#information-about-setups-that-are-known-to-work).
Further information for the list of tested adapters is the firmware version of the Display Port firmware used (see #training-error) and the firmware version of the TPS65982 controller (see #firmware-version-of-your-tps65982-controller-chip).
## Firmware Versions to report
To make your results reproducible you need to provide the firmware versions used.
* Firmware version of the Display Port firmware used (see section [Check Display Port Firmware Version](#check-display-port-firmware-version))
* Firmware version of the TPS65982 controller (see section about [Firmware version of TPS65982](#firmware-version-of-your-tps65982-controller-chip)).
## Where to report your findings
......