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Help troubleshooting thunderbolt 3 on Dell

mx flag

I have a Dell XPS 9370 and many people have had issues with the left two USB type C thunderbold 3 ports. No aforelinked solutions quite worked.

In my case, the two left side type C ports charge the laptop and can connect to an external monitor but seem to not connect any flash drives, keyboards or webcams. I know that the flash drive, keyboard and webcam work because they do so in the single USB 3 port on the right hand of the XPS.

The only command that shows anything thunderbolt related is lsmod | grep thunderbolt

intel_wmi_thunderbolt    20480  0
wmi                    32768  5 intel_wmi_thunderbolt,dell_wmi,wmi_bmof,dell_smbios,dell_wmi_descriptor

I tried updating the firmware as given here but it compained about not finding any compatible device. I don't even have a thunderbolt folder in /sys/bus/. boltctl domains also does not return anything. I am on kernel 5.11.0-31-generic x86_64 in Ubuntu 21.04. I am hoping this is not a hardware issue because I ran Dell Pre-boot diagnostics and everything was fine there.

If someone could help me troubleshoot this, I'd be grateful!

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