09-23-2020, 01:44 AM
I am seeing the same problem. I have a new Pinebook Pro running Manjaro 5.7.19-1-MANJARO-ARM #1 SMP Wed Sep 2 20:43:09 +03 2020 aarch64 GNU/Linux. I am unable to get it to detect a Dell UltraSharp 27 4K USB-C Monitor - U2720Q external display plugged in via the included USB-C cable. Charging works, but video out does not.
The user manual says the monitor supports: 1 x USB Type-C (Alternate mode with DisplayPort 1.4, USB 3.0 upstream port, Power Delivery PD up to 90 W).
When I plug the cable into the Pinebook Pro, dmesg shows the following:
I have tried rotating the cable and also booting with it plugged in. The monitor works in a Macbook Air (2018) but not with the Pinebook. As this is still on the 5.7 kernel, it seems unrelated to the regression in the 5.8 kernel. I posted on the Manjaro forums but they didn't know how to debug it. Any suggestions?
The user manual says the monitor supports: 1 x USB Type-C (Alternate mode with DisplayPort 1.4, USB 3.0 upstream port, Power Delivery PD up to 90 W).
When I plug the cable into the Pinebook Pro, dmesg shows the following:
Code:
[Mon Sep 21 10:39:06 2020] usb 7-1.5: USB disconnect, device number 11
[Mon Sep 21 10:39:06 2020] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
[Mon Sep 21 10:39:06 2020] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
[Mon Sep 21 10:39:30 2020] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
[Mon Sep 21 10:39:30 2020] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
[Mon Sep 21 10:39:30 2020] typec_displayport port0-partner.0: No compatible pin configuration found:0000 -> 0014, 001c <- 0000
[Mon Sep 21 10:39:30 2020] usb 7-1: new high-speed USB device number 12 using xhci-hcd
[Mon Sep 21 10:39:30 2020] usb 7-1: New USB device found, idVendor=0451, idProduct=8442, bcdDevice= 1.00
[Mon Sep 21 10:39:30 2020] usb 7-1: New USB device strings: Mfr=0, Product=0, SerialNumber=1
[Mon Sep 21 10:39:30 2020] usb 7-1: SerialNumber: 52010851800D
[Mon Sep 21 10:39:30 2020] hub 7-1:1.0: USB hub found
[Mon Sep 21 10:39:30 2020] hub 7-1:1.0: 6 ports detected
[Mon Sep 21 10:39:30 2020] usb 8-1: new SuperSpeed Gen 1 USB device number 6 using xhci-hcd
[Mon Sep 21 10:39:30 2020] usb 8-1: New USB device found, idVendor=0451, idProduct=8440, bcdDevice= 1.10
[Mon Sep 21 10:39:30 2020] usb 8-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[Mon Sep 21 10:39:30 2020] hub 8-1:1.0: USB hub found
[Mon Sep 21 10:39:30 2020] hub 8-1:1.0: 4 ports detected
[Mon Sep 21 10:39:31 2020] usb 7-1.5: new high-speed USB device number 13 using xhci-hcd
[Mon Sep 21 10:39:31 2020] usb 7-1.5: New USB device found, idVendor=0451, idProduct=82ff, bcdDevice= 2.00
[Mon Sep 21 10:39:31 2020] usb 7-1.5: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[Mon Sep 21 10:39:31 2020] hid-generic 0003:0451:82FF.000A: hiddev97,hidraw2: USB HID v1.11 Device [HID 0451:82ff] on usb-xhci-hcd.1.auto-1.5/input0I have tried rotating the cable and also booting with it plugged in. The monitor works in a Macbook Air (2018) but not with the Pinebook. As this is still on the 5.7 kernel, it seems unrelated to the regression in the 5.8 kernel. I posted on the Manjaro forums but they didn't know how to debug it. Any suggestions?