eGPU setup - internal laptop display not usable
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
I have the following configuration:
- Xubuntu 20.04 updated to kernel 5.4.0-47
- Lenovo Thinkpad T480 with Intel i5-7300U and Intel HD Graphics 620
- eGPU via Thunderbolt 3: HP Omen Accelelerator + Nvidia GFX1070
- 2 external monitors connected to the eGPU: 1 DisplayPort + 1 DVI
Before the upgrade to kernel 5.4.0-47 I could use all 3 monitors (1 internal + 2 external).
Since the upgrade to kernel 5.4.0-47 the internal monitor is not usable anymore. It is not displayed by xrandr --query and remains blank with a small background luminescence
Expected to happen: to be able to use all 3 available monitors (2 external + 1 internal)
What happens: only the external monitors (the one connected directly to eGPU) are available, the internal monitor remains black but with backlight.
lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-
ProcVersionSign
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelMo
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CasperMD5CheckR
CurrentDesktop: XFCE
Date: Thu Sep 17 09:18:19 2020
InstallationDate: Installed on 2020-08-29 (18 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20L6S8LU1W
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.187.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/02/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N24ET59W (1.34 )
dmi.board.
dmi.board.name: 20L6S8LU1W
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad T480
dmi.product.name: 20L6S8LU1W
dmi.product.sku: LENOVO_
dmi.product.
dmi.sys.vendor: LENOVO
summary: |
- eGPU ssetup - internal laptop display not usable + eGPU setup - internal laptop display not usable |
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