change screen alignment & wallpaper is covering only half screen

[Chris Guiver]

Lubuntu 20.04 daily.
(on hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600))

Exploring another issue, I booted daily and opened Monitor.Settings to adjust the displays to match my setup. I then opened Qterminal (I'll need that too). Then I adjusted the Monitor.Settings configuration to my setup (one screen above the other), missing slightly what I wanted so I adjusted again (I got my desired result from Monitor.Settings, but wallpaper is wrong).

Expect result.

The wallpaper should be visible 'stretched' across both displays

Result I got

Instead my lower display has the top of the wallpaper, my top display has no wallpaper (terminal is visible in the black) and bottom of wallpaper cannot be seen.

This issue is minor, I've noted it before (in bug reports that with other issues that may be related on vertical alignment displays). This issue is not new, just reporting it alone is.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lubuntu-artwork 19.10.3
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu13
Architecture: amd64
CasperVersion: 1.434
CurrentDesktop: LXQt
Date: Tue Dec 10 01:22:02 2019
Dependencies:

LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191209)
PackageArchitecture: all
SourcePackage: lubuntu-artwork
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1855792

[Chris Guiver (guiverc)]

daily test on hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600) again
I modified displays to match my setup (vertical, one screen above the other)
logged out to try using openbox for a quick test; logout of openbox
logged back into Lubuntu and

- my-top display had no wallpaper
- my-bottom display had the top-half of the default wallpaper

display orientation was saved in prior session (before logout & openbox session, then login now) but it has mucked up wallpaper now.

this is minor; though as a test I changed wallpaper & my top-display was still black (no-wallpaper), and my bottom-display had top of replacement wallpaper.

i played with Monitor.Settings and on adjusting displays and clicking 'Apply' I'd momentarily see the image correctly then top-display would go black & top-half of wallpaper would be re-drawn on bottom display.

From play (Monitor.Settings, esp. the Keep.monitors.attached option), I could correct & cause this issue to re-occur at almost predictable fashion..

I suspect from play this issue relates to http://launchpad.net/bugs/1814490, and an issue I've been wanting to raise upstream for a few weeks (but am unsure how to word..). Keep.monitors.attached??

What was obvious though - there was a bright blue line bottom of my-top monitor, being the top of the wallpaper (1910-boat-on-beach.png) that I suspect relates to issue, it shouldn't be there I believe (ie. slight overlap) occurs when Keep.monitors.attached is checked.. that seems to cause 1814490 & this to be mostly predictable..

[Chris Guiver (guiverc)]

hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
groovy daily

had this occur as I tried (live daily QA-test) to arrange displays, and wrongly set my top-display at bottom, and my-bottom display as top one, one screen was black the other had half the wallpaper..

[Chris Guiver (guiverc)]

hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
QA-test install 2020-06-16 ISO
testcase: full disk, BIOS, ..

on reboot however on altering the monitor settings to match setup had reoccurrence of https://bugs.launchpad.net/ubuntu/+source/lubuntu-artwork/+bug/1855792

top of wallpaper shows on my-bottom monitor, my-top monitor has no background

[Chris Guiver (guiverc)]

lubuntu groovy daily qa-test (live) on
hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
on changing displays to match my config I had this issue occur.

I slipped with mouse & dropped dvi-i-2 higher than intended & it disappeared outside of window & wasn't connected (the slip must have put it just higher than small window allows), on correction of displays (which was easy) the top of the (now spanned) wallpaper was displayed on my.bottom monitor, my.top display had no wallpaper..

[Chris Guiver (guiverc)]

lubuntu 20.04.2 daily QA-test on
- dell [optiplex] 960 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)
in live session
"logout, login again & wallpaper only covers single screen;
-- my.top display is black,
-- my.bottom display has 'top' of wallpaper..

[Chris Guiver (guiverc)]

this is almost the same as 1845756 so marking as duplicate