External display stopped working, "dpcd read failed: -22" in dmesg
#4
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/m...-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.
*/


Messages In This Thread
RE: External display stopped working, "dpcd read failed: -22" in dmesg - by Valinor - 05-01-2020, 03:14 AM

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