Public bug reported:
OK I am using Ubuntu 21.04 on a Raspberry pi 4 model B 4GB ram.My Monitor is LG
Flatron E1942 with a resolution of 1366x768,It's a VGA monitor so I am using an
HDMI to VGA converter to connect it with the monitor.This resolution is not
automatically detected by Ubuntu,but it worked with Raspbian and Kali
Linux.Therefore I edited the config.txt file and added these following lines
hdmi_group=2,hdmi_mode=39 and hdmi_cvt=1366 768 60 3 0 0 1 otherwise the
display will go blank, after editing this the monitor used to work with Ubuntu
20 (but still was not perfect,it got some black vertical lines in gnome but it
worked perfectly fine with KDE-plasma)
but after upgrading it to 21.04 this configuration doesn't work anymore.
So at this point how the monitor work is like is this:
1)If a turn on pi with monitor connected to it the boot menu and raspberry pi
rainbow colors shows up,but the screen goes black once it enters gnome desktop.
2)If I connect the monitor only after the pi enters gnome.The monitors
shows up with a weird resolution(1280x720) but goes black if I open
settings.
3)If I connect the monitor after the pi enters gnome.The monitors shows
up with a weird resolution(1280x720) and I use xrandr in terminal to set
resolution "again to 1280x720",at this point I can open settings and
change the resolution to 1360x768.Once I set it to 1360x768 the display
is perfectly aligned,(I want this resolution every time I boot up
without doing all these adventures)
I have to repeat this step 3 every time I boot up the pi otherwise the screen
goes blank.
Kindly fix this bug.
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubuntu-docs 21.04.1
ProcVersionSignature: Ubuntu 5.11.0-1012.13-raspi 5.11.21
Uname: Linux 5.11.0-1012-raspi aarch64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: arm64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 27 17:12:21 2021
ImageMediaBuild: 20201022
PackageArchitecture: all
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IN
SHELL=/bin/bash
SourcePackage: ubuntu-docs
UpgradeStatus: Upgraded to hirsute on 2021-06-27 (0 days ago)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: apport-bug arm64 arm64-image hirsute raspi-image wayland-session
** Attachment added: "This is how the resolution looks."
https://bugs.launchpad.net/bugs/1933758/+attachment/5507435/+files/Screenshot%20from%202021-06-27%2017-45-14.png
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https://bugs.launchpad.net/bugs/1933758
Title:
Display resolution not properly identifying in Ubuntu 21.04
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