01-27-2020, 11:54 AM
(01-14-2020, 11:11 PM)brownbike Wrote: NigelT, have you made any headway on this? I'm in the same boat, where I'm connection to a 4K monitor over USB-C and I'm only getting 1080 resolution.
I didn't manage to get 4k output directly USB-C to USB-C, but I managed to get 4k output via a USB-C to HDMI adapter (adapter in the PBP's USB-C port then an HDMI cable to an HDMI port on the monitor). Although I found the right third of the external 4k screen to be corrupted if running dual (internal panel + external 4k) displays, but fine if I turned off the internal panel.
The adapter I'm using is https://www.ebuyer.com/797322-xenta-usb-...chdmiadptr
lsusb shows the device ids as 9636:9300
I can't fully recommend that adapter though as I have access to a few other monitors with different native resolutions, 1600x1200 and 1920x1200, and it was unable to run those monitors at their native resolutions (running a 1920x1200 monitor at a sub-optimal 1920x1080) when using the default Debian 9 based OS. Interestingly I tried the Debian Buster OS (newer kernel) and could use those 1600x1200 and 1920x1200 resolutions (as well as 4k) with the same PBP and same USB-C 9636:9300 adapter - but still no 4k using just a USB-C adapter.
