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+--- Thread: External display stopped working, "dpcd read failed: -22" in dmesg (/showthread.php?tid=9344)
External display stopped working, "dpcd read failed: -22" in dmesg - zackw - 03-03-2020
Yesterday, I was having no serious problems driving an external display from my PBP via a USB-C-to-HDMI adapter (J5create model JCA379).
This morning, I boot it up (it was shut off for the night), plug in the adapter, and the external display isn't recognized, and I see a flood of error messages in dmesg:
Code:
fusb302 4-0022: CC connected in CC1 as DFP
cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Not connected. Disabling cdn
fusb302 4-0022: PD connected as DFP, supporting 5V
fusb302 4-0022: DP config successful, pin_assignment 0x8
cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Not connected. Disabling cdn
fusb302 4-0022: attention, dp_status 9a
cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected, not enabled. Enabling cdn
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
[57 repeated messages suppressed]
usb 3-1: new high-speed USB device number 2 using xhci-hcd
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
[23 repeated messages suppressed]
usb 3-1: New USB device found, idVendor=2109, idProduct=2210
usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-1: Product: USB2.0 Hub
usb 3-1: Manufacturer: VIA Labs, Inc.
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
hub 3-1:1.0: USB hub found
hub 3-1:1.0: 4 ports detected
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
[87 repeated messages suppressed]
usb 3-1.2: new high-speed USB device number 3 using xhci-hcd
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
[33 repeated messages suppressed]
usb 3-1.2: New USB device found, idVendor=2109, idProduct=0100
usb 3-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1.2: Product: USB 2.0 BILLBOARD
usb 3-1.2: Manufacturer: VIA Technologies Inc.
usb 3-1.2: SerialNumber: 0000000000000001
cdn-dp fec00000.dp: [drm:cdn_dp_dpcd_read] *ERROR* dpcd read failed: -22
[94 repeated messages suppressed]
cdn-dp fec00000.dp: [drm:cdn_dp_check_sink_connection] *ERROR* Get sink capability timed out
cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] *ERROR* Enable dp failed -19What might be wrong? I reiterate that this did work yesterday, and there have been no software updates since. I'm running the stock install and mrfixit_update.sh reports nothing to do.
RE: External display stopped working, "dpcd read failed: -22" in dmesg - zackw - 03-05-2020
Update: I tried installing unstable Debian using danielt's script, which brings a substantially newer kernel (5.5.0). The flood of "dpcd read failed: -22" errors do not happen with this kernel, but I still get the "Get sink capability timed out" error, and the external display doesn't activate:
Code:
[ 4.345616] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
[ 4.501049] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Connected, not enabled. Enabling cdn
[ 9.692480] cdn-dp fec00000.dp: [drm:cdn_dp_check_sink_connection [rockchipdrm]] *ERROR* Get sink capability timed out
[ 9.694181] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] *ERROR* Enable dp failed -19I also tested the cable and USB-C adapter using a different computer (running Windows) and they seem to be fine.
please help i'm at my wits' end here
RE: External display stopped working, "dpcd read failed: -22" in dmesg - stephan48 - 03-15-2020
Hi,
I am currently investigating myself why during a travel session at the beginning of February I suddently could not drive an external monitor anymore.
I now reinstalled the OS based on danielt's scripts with crypted Debian Buster - the dptx.bin file is present in initramfs and loads.
The errors I see are the exact same as in zackw's last post.
I got three different adapters - 2x DP Alternative Mode to HDMI and 1x a pure DP one.
I don't remember which adapter worked before, but one most definitively did. Now all three only result in "Enable dp failed -19".
It makes no difference if i use the 5.4 or the 5.5 kernel - so far I did not install the stock OS again.
Any other part of the adapters(Network, USB-A, microSD Readers) work.
Its all a bit strange.
RE: External display stopped working, "dpcd read failed: -22" in dmesg - Valinor - 05-01-2020
Hi,
Here I experiment the same problem, USB-C to hdmi adapter works like a charm for more than two month, and today, not even after a upgrade or update, I can see the exact same error as in zackw's post and no external monitor.
I will try to investigating too. I try two different adaptator which worked before.
Its all a bit strange.
Hi, me again,
Without any change, it magical reworks - I am only making some manipulations (test with differents adaptator, plug and unplug)
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/rockchip/cdn-dp-core.c
The timeout is for 5 seconds.
Maybe in some case, it's not enough, and we shoud ?
In the code we have this comment :
Code:
/*
* Attempt to read sink count, retry in case the sink may not be ready.
*
* Sinks are *supposed* to come up within 1ms from an off state, but
* some docks need more time to power up.
*/