USB C video out not working
Expected Behavior
Oneplus 9 pro should be able to use hdmi/dp alt mode via the usb c port on the bottom to mirror screen to an external display.
I have tested this on a stock, OxygenOS op9 pro, and it works plug and play.
Current Behavior
Using Lineage 20 or 21, plugging the phone into a usb c dock does nothing.
The only thing that happens is an external display icon pops up momentarily on the top right of the notification bar, then disappears. After this only a notification about the phone providing power to an external device. No output to the external screen.
I have tried this on two different op9 pros running lineage, but not on earlier versions than 20.
EDIT: downgraded to LOS 19, 19-20221227-NIGHTLY-lemonadep, and the functionality is restored.
Steps to Reproduce
- Plug device into a usb c dock connected to an external screen.
- External screen icon pops up momentarily in notification bar and then disappears.
- Nothing happens on the second screen, no output.logcat.txt
Device information
/device lemonadep /version lineage-21 /date 2024-02-16 /kernel 5.4.268-qgki-gbadcf67e7720 #1 Fri Feb 16 03:51:20 UTC 2024 /baseband Q_V1_P14 /mods Google Apps
I have read the directions.