lubuntu - strange movement of wallpaper on monitor.settings change (or next login)

[Chris Guiver]

File upstream as https://bugzilla.icculus.org/show_bug.cgi?id=6566

Originally Lubuntu 19.10 daily
deb cdrom:[Lubuntu 19.10 _Eoan Ermine_ - Beta amd64 (20190926.1)]/ eoan main multiverse restricted universe

I adjusted the monitor.settings to match my setup, also changing the primary screen and it did exactly what I wanted, however the wallpaper appears to have been misplaced; the top.of.wallpaper is now displayed on my bottom.monitor with my top.monitor having no wallpaper (this bottom half of wallpaper isn't shown)

The importance of this is probably MINIMAL.

I have been able to re-create it, but it only seems to occur with a specific setup, and is likely linked to https://github.com/lxqt/lxqt/issues/1709 or https://github.com/lxqt/lxqt/issues/1704 (though upstream suspect those two bugs & others are linked).

Note: The right-click behavior on the screen without wallpaper is likely to be Openbox only (ie. openbox menu), where as the screen with wallpaper will remain Lubuntu/LXQt behavior.

---
LXQt 0.16 on Lubuntu Hirsute; this has been re-created. Also note (see comments #10-12)
- On the TOP.monitor I'm getting OPENBOX menu on right click
- On the BOTTOM.monitor, I'm getting standard LXQt menu

Also occurs on opensuse tumbleweed & debian bullseye, & fedora 33

Filed upstream as https://github.com/lxqt/lxqt/issues/1925 (closed as only occurs with openbox)

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: lxqt-session 0.14.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-10.11-generic 5.3.0-rc8
Uname: Linux 5.3.0-10-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CasperVersion: 1.419
CurrentDesktop: LXQt
Date: Sat Sep 28 12:41:52 2019
LiveMediaBuild: Lubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190926.1)
SourcePackage: lxqt-session
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/1845756

[Chris Guiver (guiverc)]

Look at https://discourse.lubuntu.me/t/keep-monitors-attached-expected-behavior/689 on hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290) on very recent (yesterday?) install of 20.04 & this issue re-occurred.

hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
(it shares same monitors as hp 8200 reported on previously)

My list of done so far is

full-upgraded (no reboot)
turn 'keep monitors attached' OFF
black screen on 'my top' monitor; 'my bottom' monitor now shows top of 19.10 wallpaper :(

[Chris Guiver (guiverc)]

I just noticed my primary d960 box (dell [optiplex] 960 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)) has no wallpaper anymore on it's top monitor, but 'top' of wallpaper on my bottom monitor.

The box was also used in testing mentioned in comment #3, but windows covered the wallpaper (both monitors) so it took some time for me to notice.

[Chris Guiver (guiverc)]

QA- install on
hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
testcase: manual partitioning, using free space, BIOS, ENCRYPTION, internet

On reboot, after validating the 'new' install I adjusted displays to match my setup; and had https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756 occur; top display has the bottom of the wallpaper, my bottom display contains the top of wallpaper; mouse movement though is correct.

[Chris Guiver (guiverc)]

lenovo thinkpad x201 (i5-m520, 4gb, i915) hirsute daily

primary purpose is exploration of http://launchpad.net/bugs/1905947
boots up with laptop monitor on left, external monitor on right... panel on external monitor..

for this test, I'll swap external & internal monitor around, left-right becomes right-left

grr, on change I experienced https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756 or the left-part of the wallpaper displayed on now right monitor, the left monitor now just black (no wallpaer)... this issue hadn't appeared during the groovy cycle!!?? :(

[Chris Guiver (guiverc)]

I can confirm this issue is NOT Lubuntu specific..

I just experienced this exact issue on Fedora 33
LXQt 0.15.0, Qt 5.15.2

I have NOT experienced this though in opensuse which is a later LXQt (this is more noticable due to https://bugs.launchpad.net/ubuntu/+source/lxqt-config/+bug/1905947 which causes the monitor configuration to be set on each login, which impacts Fedora 33 just like Lubuntu, but not the later opensuse LXQt 0.16)

[Chris Guiver (guiverc)]

QA-test (hirsute) on
- hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)

on adjusting monitor.settings to match my setup, my-top monitor now is black, and top.of.wallpaper is now displayed on my-lower monitor; ie. https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756 - this issue is petty & minor (logout & login usually fixes this, but I can't do that currently due to prior issue)...

changing wallpaper still had black-no-wallpaper top monitor??? which doesn't usually occur as far as I recall, top of wallpaper still showing bottom display only which I expected to resolve issue.. but still ignoring this.. as impossible to explore properly until other issue is fixed

As I have not experienced this in opensuse (tumbleweed); maybe it's related to Qt, as the other issue I mention (https://bugs.launchpad.net/ubuntu/+source/lxqt-config/+bug/1905947) is Qt related doesn't occur there either..

[Chris Guiver (guiverc)]

Lubuntu daily QA-test [2020-02-22.1 using LXQt 0.16)
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
in live session, display config was changed, I logged out & logged in again (testing for another bug), and matching this bug

"the wallpaper appears to have been misplaced; the top.of.wallpaper is now displayed on my bottom.monitor with my top.monitor having no wallpaper (this bottom half of wallpaper isn't shown)"

(quoting from description of this report). The Monitor.Settings were changed prior to logout & login, and this effect did NOT occur until I re-logged in (still a live session).

[Chris Guiver (guiverc)]

Repeat of comment #9 on Lubuntu daily hirsute, on
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

Again, I was testing for other bugs, and the logout/login step used to prove that caused this issue to re-appear.

PLEASE NOTE:

I don't consider this bug an issue with regards Lubuntu.

Yeah it's a bug, however I've not experienced it (that I can recall recently) on an installed box.

Whatever the issue is though, I noted today

- On the TOP.monitor I'm getting OPENBOX menu on right click
- On the BOTTOM.monitor, I'm getting standard LXQt menu

[Chris Guiver (guiverc)]

Right clicking black top.monitor

screengrab is achieve via quick combination of PRINTSCREEN then right-click on mouse being pressed... works on these slower boxes :)

contrast MENU with menu when right click is pressed on bottom.monitor (next comment)

[Chris Guiver (guiverc)]

Right clicking black bottom.monitor

contrast MENU with menu when right click is pressed on top.monitor (prior comment #11)

[Chris Guiver (guiverc)]

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

repeat of testing covered in comments #10-12 on different box

On both dc7700 (#10-12) & this box, I was unable to correct issue (changing wallpaper would change half visible on the one display; other would remain black).

I also still have the OPENBOX menu appearing on one screen (black monitor), with LXQt/Lubuntu on the other (one showing wallpaper) which I don't recall noticing before..

Note: I had to have my.top monitor positioned as the bottom.display, and my-bottom monitor positioned as the top monitor.. meaning in normal testing I'd not likely notice this issue as it only occurs on a specific display configuration.

If this is reported upstream; that point will need to be made (I don't recall this occurring on opensuse with LXQt 0.16 so does the issue require openbox to occur? or is this specific to Lubuntu... needs testing on opensuse maybe next)

[Chris Guiver (guiverc)]

I can re-create this on opensuse tumbleweed....

My tumbleweed is using openbox too, reaction is identical with menu being LXQt on the display with wallpaper, openbox menu appearing on now-black monitor...

Issue occurs with one screen orientation, reverse it and issue does not occur.

this needs to be filed upstream.

[Chris Guiver (guiverc)]

Turns out Debian Bullseye/sid is running LXQt 0.16 too, so tested there and could create it there too.

[Chris Guiver (guiverc)]

On the debian bullseye/sid box, I switched out openbox ..

I could NOT re-create the issue using `xfwm4`
I could NOT re-create the issue using `icewm`
switching back to openbox & issue could be re-created again..

it's openbox only it appears... so maybe this issue is mis-filed?

(I'm also tired, but I don't think I made errors..)

Given upstream (LXQt) will likely reject this now.. I could test on a Lubuntu system with other than openbox, but not tonight.

[Chris Guiver (guiverc)]

I just experienced this again at login on a QA-test install performed yesterday.
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

I was using box for support purposes (remote access from remmina) & indirectly caused my real/visible session to logout (I was trying to logout/close my remote session).

On logging back in with the physical session,

- my top display is now black (no wallpaper), bottom display has the top-half of the actual wallpaper. (box has two displays, one above the other)

- top (black) display now shows openbox options on right-click of black-background

- bottom display (top half of wallpaper) right-click has expected LXQt/Lubuntu menu appear

[Chris Guiver (guiverc)]

** Background

Originally filed at https://bugs.launchpad.net/ubuntu/+source/openbox/+bug/1845756

Reported initially on Lubuntu 19.10, occurs all releases up to current development (hirsute). Also confirmed on opensuse tumbleweed, Debian Bullseye/sid, Fedora 33

Initially believed to be a LXQt issue, it was filed upstream (LXQt) at https://github.com/lxqt/lxqt/issues/1925 however if openbox is switched out and replaced with xfwm4, or icewm, the issue is gone. To return issue openbox needs only to be used, hence filing here.

** Description

On certain display configurations (one monitor above the other), clicking Apply causes one display to go black, and the other to have half the wallpaper.

Further, a right-click on the monitor that has background causes the LXQt menu to appear, however right-click on the other monitor (that is black) only has Openbox's menu appear

Note: if you reverse the top/bottom display, the issue does not occur.

** Expected Behavior

Wallpaper appear on both monitors (half on each)
LXQt menu appears on both monitors when right-click pressed

** Actual Behavior

On changing display configuration (2x displays, 1920x1080) with one display above the other, on clicking apply you get

- one monitor has no background, openbox menu appears with right-click
- other monitor has half of the wallpaper/background, LXQt menu appears with right-click

** Steps to Reproduce

- Two monitors, 1920x1080.
- (on LXQt) open Monitor.Settings and set one display above the other
- click Apply
- if issue doesn't occur, firstly I'd suggest logout & login again
- if issue still hadn't occurred, swap top & bottom monitors & re-apply. logout & login may be required as well.

(note I've had the logout/login required, and not-required; can't provide clues as to how that relates (insufficient testing-sample-size for picture sorry)

Note: If the top/bottom monitor is in one order, the issue will not occur. If so reversing the top/bottom will have the issue occur.

** Some system information

Distribution & Version: Lubuntu hirsute, Opensuse tumbleweed & Debian Bullseye
Kernel: 5.10.0-14, 5.10.16-1, 5.10.0-3

On Lubuntu, `openbox --version` reports "Openbox 3.6.1"

** For pictures & more detail

refer https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756 but I'd concentrate on comments #10 & later

Top display - https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756/+attachment/5467407/+files/screen_top_menu.jpg

Bottom display - https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1845756/+attachment/5467410/+files/screen_bottom_menu.jpg

[Chris Guiver (guiverc)]

Sorry the picture links are incorrect (the filing was changed from lxqt-session to openbox and I forgot that would change the urls)

Top display picture is now
- https://launchpadlibrarian.net/525145031/screen_top_menu.jpg

Bottom display picture is now

- https://launchpadlibrarian.net/525145132/screen_bottom_menu.jpg

(or you can use original links by replacing "lxqt-session" with "openbox")

[Chris Guiver (guiverc)]

Lubuntu impish daily QA-test on
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

adjust displays to match my setup (grr https://bugs.launchpad.net/openbox/+bug/1845756).

Note: My first attempt to orient the screens to match my setup was reversed (top at bottom, bottom at top) so it was adjusted a second time quickly... it was after this re-adjustment that top monitor was black & my-bottom-monitor contains op of wallpaper..

logged out, login again and still wallpaper on my bottom display (top half), no wallpaper on top display...

right-click on top display black-background shows openbox menu, right-click on bottom display (with wallpaper) shows lubuntu/lxqt menu

[Chris Guiver (guiverc)]

Lubuntu jammy daily (ISO 2020-04-13) on
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

both monitors are landscape currently; only change was swap left & right

[Chris Guiver (guiverc)]

Lubuntu kinetic daily (ISO 2020-04-13) on
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

both monitors are landscape currently; only change was swap left & right

you'll note background on my-left screen is none, my-right screen has left portion of wallpaper/background

[Chris Guiver (guiverc)]

Lubuntu kinetic daily (ISO 2020-06-08) on
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

LXQt now 1.1.0.

My monitors are both still landscape; only change being swap left & right

You'll note background on my-left screen is none, my-right screen has left portion of wallpaper/background

I just noticed (again) the screen that doesn't have the wallpaper shows OPENBOX menu on right-click, the screen which has a wallpaper shows a LXQt or normal Lubuntu menu.

I logged out, logged in again & my-left-monitor still had no background, my-right-monitor had left-half-of-background-wallpaper... I attempted `sudo apt update; sudo apt full-upgrade` and a few packages upgraded and tried (logout/login) again but no difference.

Still have OPENBOX.MENU on my-left no-wallpaper-display & normal-Lubuntu.LXQt menu on my-right wallpaper-display

See next two comments for pics of OBMENU vs normal-Lubuntu-LXQt menu on right-click.

To correct issue, I needed to do 3 changes within Monitor.Settings before backgrounds appeared on both displays, and everything (right-click on background) worked as expected..

I still don't consider it a real problem; the lack-of-background allows you to see on Monitor.Settings.Apply if the issue was fixed, or the move failed to make a change.. To get it to work you really need to change it to something else (where issue is gone), then back to what matches this (or other) setup & it wallpaper isn't on both displays this issue is still an issue.. The issue never always appears, only occasionally (most commonly on first change after live boot)

[Chris Guiver (guiverc)]

this pic should show the OPENBOX type menu now appearing on the screen without background (the wallpaper was on my-right display above the LXQt panel)..

mouse-pointer was top-right (3 o'clock) on left monitor where OBMENU appears..

No normal Lubuntu/LXQt menu appears on the left screen when it has no background.

[Chris Guiver (guiverc)]

~same as #24 pic except on other display; note: no OBMENU

(screens will show as slightly different in that I minimized firefox so background was right-click-able.. and I closed screengrab window, but I right-clicked right monitor; though slightly further right & lower..

KEY IS DIFFERENT MENU that appears on RIGHT-CLICK on this monitor compared with #24

[Chris Guiver (guiverc)]

Lubuntu lunar QA-test on
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

Change made to screen alignment is swap LEFT & RIGHT displays (both now landscape)

No wallpaper now visible on my-left display, the left part of the wallpaper appears on my-right display... I closed-reopened the Monitor.Settings tab then dragged to the left screen.

Left screen now reacts very different to right-clicks on desktop (ie. openbox menu opens, no longer handled by LXQt) but that's no change.

[Chris Guiver (guiverc)]

different box to prior runs (new replacement for d960), and box currently has windows11 I don't want, so booted the Lubuntu lunar daily to explore box... alas this issue appears

- dell optiplex 7050 (i5-6500, 16gb, intel hd530/i915)

grey screen for my top.monitor, and top-of-wallpaper appearing on my bottom.monitor. openbox menu appears on top.monitor, and lxqt.menu on bottom.monitor.

a number of goes at altering screen position to get wallpaper appearing on both & right-clicking-background & correct menu appearing on both; but on 4th or 5th attempt all was good.

[Chris Guiver (guiverc)]

I've added `lubuntu-default-settings` to this bug report because of something I just noticed on this very recent install.

- hp prodesk 400 g1 sff (i5-4570, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

Currently I'm using the lunar install (23.04), and I noticed that I can login using 'LXQt session' without issue...

However if I select the 'Lubuntu session' I get a wallpaper top display, but black screen bottom screen. I also get no LXQt panel (it's not appearing on the bottom screen where it belongs), nor is Ctrl+Alt+T etc. working with the Lubuntu session... The Lubuntu session is rather limited

Both LXQt session & Lubuntu session are using Openbox? Thus the addition of `lubuntu-default-settings` as maybe there's more involved than just openbox.

Sure I can fix by replacing `openbox` with `xfwm4`, `fluxbox` etc.. and I have no issues with the 'Lubuntu session', but why is 'LXQt session' working still even though the only WM installed currently (& thus being used) `openbox`.

This install is still very clean.

[Chris Guiver (guiverc)]

this picture shows the Lunar setup when logged in with LXQt (openbox being used)

All looks good.

[Chris Guiver (guiverc)]

this login uses the Lubuntu session on same box, same setup.
timestamp only ~1 min difference (ie. logout, login, printscreen & save pic

Two displays; one above the other - top as expected with wallpaper
Bottom display however appears all black, no LXQt panel etc, no Ctrl+Alt+T works, no LXQt menu on right-click

[Aaron Rainbolt (arraybolt3)]

Possibly related, every once in a while, when I boot a Lunar ISO in QEMU, part of the right side of the screen fails to render. It's difficult to reproduce though - it happens at random. It's not just LXQt failing to render there - if I open a window and try to push it into the empty space, the part of it in the blank area vanishes as if I had pushed it off the screen. Yet attempts to resize the QEMU window indicate that the VM has the screen set to a larger size, as does the fact that some LXQt panel elements are missing as they (presumably) are in the blank area.

The attached screenshot of the QEMU window shows the problem.

If I open "Monitor settings" from the Application Menu and change the screen resolution, it appears to make the "missing" area of the screen come back.

[Chris Guiver (guiverc)]

Lubuntu 22.04.2 daily (RC?) QA-test install to dc7700

first boot; adjusted displays to match setup (side by side; this video card has the system mirror displays on new install) and a 'gap' appears between the display despite lxqt-config-monitor having the monitors touching...

I've positioned the monitor-settings window so it should appear on both monitors.. you'll note the picture of settings shows the monitors actually touching HOWEVER there is a huge gap between them in what is displayed & I cannot see anything in that gap...

If i move the mouse cursor from one window to another, there is a long delay (I have to keep moving mouse) before it re-appears...

I may have filed more on this issue on another bug report; but this is what I saw on search & don't have time to explore further currently.. It's NOT a major issue for me, as I've learnt how to mitigate this (by replacing openbox, or just re-adjusting displays a few times & it'll stop occurring)

alas this has occurred on a QA RC install.

(this comment should probably have been filed under https://bugs.launchpad.net/ubuntu/+source/lxqt-config/+bug/1882411 sorry)

[Chris Guiver (guiverc)]

Likely related is https://bugs.launchpad.net/ubuntu/+source/openbox/+bug/2013074

In a live session (made changes to alignment of screens, then logout/login) I was able to trigger this bug + the newer 2013074 on different screens..

The screen impacted by THIS BUG REPORT still had OBMENU appear on it's grey display (the screen impacted by other bug was black, with only mouse-pointer visible when dragged across it).. on using the RESTART OPENBOX option in OBMENU I was able to get the live session to respond as per LXQt expectations on the screen impacted by this bug report.. (alas lxqt-panel was on display impacted by other issue thus out-of-reach).

Lunar live QA-test on
- hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)

[Chris Guiver (guiverc)]

I'll tag this today using Lubuntu noble..

Booted live on my primary box
- dell [optiplex] 7050 (i5-6500, 16gb, intel hd530/i915, amd cedar radeon)

On boot only 3 monitors connected to internal intel card are functional.. not a problem; open monitor.settings & enable the others.. & they have wallpapers & look good.

next I adjust the alignment of monitors to match my setup, and suddenly 4.4 of the monitors are black (no wallpaper) and part of the wallpaper only shows on one monitor...

if I right click the black monitors I'm getting OBMENU appearing and not expected LXQt menu...

I try re-adjusting the monitors again (numerous times) and no useful change... exit & re-enter monitor.settings (panel was still visible/usable!) & try again a few times, no go..

Exit & re-open monitor.settings (again) & this time I get wallpapers on all monitors & operation is EXACTLY was I'd want.. even have alignment of screens matching my setup..

People only do this screen alignment RARELY; on first setup, and on a 'blue moon' when they adjust their offices etc.. and in all cases where I experience this, I can usually resolve it in ~5 minutes.

---

I don't see it as critical, but its a little frustrating, and could be very confusing the first time.

In support; I'll just suggest end-users who experience it just replace `openbox` with `xfwm4` and the issue doesn't happen.

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

I'm going to mark lubuntu-default-settings as incomplete here. I'm not sure I entirely see how it's relevant. It's not clear to me that LXQt is to blame, either, as those upstream issues are now closed/fixed. The Openbox bug upstream is untouched, though. I'm guessing that's where the problem lies.