Display resolution of monitor via HDMI incorrectly identified
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Medium
|
Unassigned |
Bug Description
I use a Philips BDM4037U 40'', 4k monitor.
Connecting it via DP to my Lenovo 910 4k does work (except for random display blackouts).
But when connecting it via HDMI the display resolution is sometimes correctly set (I cannot see a pattern when this works) but sometimes the display resolution is just set to FullHD, 1920x1080 Pixel @ 60Hz.
Due to limitations of the supported HDMI protocol on my laptop I can only drive the display with 30Hz when in 4k mode. Which is totally fine for me. But this mode isn't correctly identified, most of the time.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-
ProcVersionSign
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 11 12:00:28 2018
HibernationDevice: RESUME=
InstallationDate: Installed on 2018-04-09 (1 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
MachineType: LENOVO 80VF
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.173
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/31/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: 2JCN39WW
dmi.board.
dmi.board.name: Agera
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: IDEAPAD
dmi.product.name: 80VF
dmi.product.
dmi.sys.vendor: LENOVO
Some additional notes: /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1762989
- 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:/