This sounds like a kernel problem. And both plymouth and the login
screen do use the same kernel interfaces...
First, please try removing these kernel parameters:
video=efifb fbcon=rotate:1
and if that doesn't solve it please also try changing the kernel
parameter "splash" to "nosplash".
Also you may be able to use this as a workaround for the login screen:
Edit /etc/gdm3/custom.conf and change:
#WaylandEnable=false
to
WaylandEnable=false
** Summary changed:
- No video signal during Ubuntu splash screen and also during Logon procedure
+ [Intel Gemini Lake] No video signal during Ubuntu splash screen and also
during Logon procedure
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1905184
Title:
[Intel Gemini Lake] No video signal during Ubuntu splash screen and
also during Logon procedure
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hello.
I don't have any video during Ubuntu splash screen and also during the logon
procedure.
I only have video in GRUB and after the logon operation takes place.
After I type in my password (in blind mode), Ubuntu will then start normally
with correct video settings (resolution, etc...).
To workaround this error, I can either:
Workaround 1) Enable automatic login. That way the system doesn't get stuck
in logon screen and Ubuntu loads immediately.
Problem: Boot splash won't be displayed anyway and I don't want this because
I'm in a multi-user scenario.
Workaround 2) Add a kernel boot option "nomodeset" in /etc/default/grub
When I do this I will always get video signal.
Problem: The computer is an ECS Hybrid Device (tablet+detachable keyboard),
and when I use this workaround, user session loads in Portrait mode (not
Landscape) and there is no auto-rotation support.
Workaround 3) Although I don't have video signal during Boot Splash and Logon
screen, I do have backlight continuously applied to the display.
If I wait 5 minutes or so in the logon screen the backlight will deactivate...
However, when I touch the keyboard or touchpad the computer will then show
video signal and I will be able to see the logon screen perfectly.
Problem: I don't want to wait 5 minutes in the logon screen to obtain proper
video signal.
Computer is this one:
https://www.ecs.com.tw/ECSWebSite/Product/Product_Overview/EN/Tablet%20PC/TH10GM2/10-inch%20Tablet%20PC
Specs are here:
https://www.ecs.com.tw/ECSWebSite/Product/Product_SPEC/EN/Tablet%20PC/TH10GM2/10-inch%20Tablet%20PC
Feel free to request any extra information.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
CompositorRunning: None
Date: Sun Nov 22 19:56:20 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard: Intel Corporation UHD Graphics 605 [8086:3185] (rev 03)
(prog-if 00 [VGA controller])
InstallationDate: Installed on 2020-11-22 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: ECS CMPC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-54-generic
root=UUID=2e7d6b98-86c2-4579-bd7f-fa31664333f6 ro quiet video=efifb
fbcon=rotate:1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/15/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.02.00.STD
dmi.board.asset.tag: Default string
dmi.board.name: ik Educational Software
dmi.board.vendor: ECS
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 30
dmi.chassis.vendor: NULL
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1.02.00.STD:bd10/15/2019:svnECS:pnCMPC:pvrDefaultstring:rvnECS:rnikEducationalSoftware:rvrDefaultstring:cvnNULL:ct30:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: CMPC
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: ECS
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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