Public bug reported:
On the netbook model Positivo Mobo 5800, it was noticed that, on the end
of the boot process, the LightDM greeter won't appear and the screen
will turn off, disabling the backlight too. To be able to log in to the
graphical interface, it's required to go to a tty (for example, tty1)
and then back to the LightDM greeter (which is tty7 on this case).
When going back to the tty7, it's noticed that there are text still from
the boot for a few seconds, until the greeter finally appears.
The CPU is an Intel(R) Atom(TM) CPU N2600 @ 1.60GHz, it has a gma500
GPU. While gma500 is limiting, I've not observed this LightDM bug with,
for example, the Positivo Mobo 5900, which has the same CPU and same GPU
with the same revision and, even when applying the same image to both,
the 5900 works while the 5800 fails.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm 1.30.0-0ubuntu4~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-100.113-generic 5.4.166
Uname: Linux 5.4.0-100-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Feb 17 15:30:44 2022
ProcEnviron:
LANGUAGE=pt_BR:pt:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=pt_BR.UTF-8
SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1961333
Title:
Netbook display is turned off on login screen on startup
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