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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https://bugs.launchpad.net/bugs/1762986
Title:
Display resolution of monitor via HDMI incorrectly identified
Status in linux package in Ubuntu:
Invalid
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-4.15.0-13-generic 4.15.0-13.14 [modified:
boot/vmlinuz-4.15.0-13-generic]
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: thet 1429 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 11 12:00:28 2018
HibernationDevice: RESUME=UUID=bedd1248-32dd-43ca-be9f-28337086ea86
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=/vmlinuz-4.15.0-13-generic.efi.signed
root=UUID=998520ff-c841-45ab-8312-2bb876ae2a0b ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-13-generic N/A
linux-backports-modules-4.15.0-13-generic N/A
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.asset.tag: NO Asset Tag
dmi.board.name: Agera
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo YOGA 910-13IKB
dmi.modalias:
dmi:bvnLENOVO:bvr2JCN39WW:bd05/31/2017:svnLENOVO:pn80VF:pvrLenovoYOGA910-13IKB:rvnLENOVO:rnAgera:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYOGA910-13IKB:
dmi.product.family: IDEAPAD
dmi.product.name: 80VF
dmi.product.version: Lenovo YOGA 910-13IKB
dmi.sys.vendor: LENOVO
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