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Tasklist

FS#72859 - No 4k resolution on an external display after upgrading to 5.15.5-arch1-1 kernel

Attached to Project: Arch Linux
Opened by Miko Nieminen (mikoni) - Sunday, 28 November 2021, 10:09 GMT
Last edited by Jonas Witschel (diabonas) - Thursday, 02 December 2021, 13:00 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To No-one
Architecture x86_64
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:

After upgrading to 5.15.5-arch1-1 kernel, I lost ability to use 4k resolution on my external display.

In my setup, I have a Lenovo Thinkpad X280 with Thunderbolt 3 docking station where I have Samsung U28E590 connected over DisplayPort.

I'm using Gnome with Wayland session.

When looking at the logs with journalctl, nothing jumped out, but I'm not really sure what should I be looking for. Let me know if I can provide additional information.

Additional info:
* linux-5.15.5.arch1-1

Steps to reproduce:
- install linux-5.15.5.arch1-1
- reboot
- no 4k resolution available when using Gnome Display Settings
- downgrade kernel to linux-5.15.4.arch1-1
- reboot
- 4k resolution is available as expected
This task depends upon

Closed by  Jonas Witschel (diabonas)
Thursday, 02 December 2021, 13:00 GMT
Reason for closing:  Fixed
Additional comments about closing:  "Seem that running additional updates fixed the problem. Probably got fixed by libdrm upgrade."

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