New theory: The monitor must be on, booted up and still not in sleep
mode when the HDMI USB-C adapter is attached to the laptop. I could get
the correct resolution already twice with this procedure.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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You received this bug
I just tried another USB-C to HDMI adapter from a friend without any issues.
I believe now that this isn't a problem with the kernel but the adapter.
The issue can probably be closed.
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Packages, which is subscribed to linux
The issue did start appearing after an update on 17.10. I bought the
Monitor on 29.11.2017, so it worked with the 17.10 kernel version around
that time. Since HDMI on 4k only drives the Monitor @30Hz on my laptop,
I bought a DP adapter. After the random screen black outs annoyed me too
much I
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16
Some additional notes:
- The same problem existed in 17.10 as well as in 18.04 beta, with x-org and
Wayland sessions.
- There is another bug regarding DP issues by me - but should be unrelated to
the HDMI problem: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762989
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