lubuntu 19.04 two displays, firefox maximized uses only part of 2nd display

Bug #1809201 reported by Chris Guiver on 2018-12-20
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lxqt-session (Ubuntu)

Bug Description

19.04 daily image QA testing x86

dell d610 laptop, with external vga monitor setup as display-to-right of laptop
(vga external has higher resolution than internal laptop display)

firefox on laptop monitor maximizes as expected.

when firefox window is on external monitor, it uses all the width, but only 2/3rds of vertical landscape of display, where I'd expect/hope it would use all of display.

// i've noted this before, but I didn't see lp bug report, sorry if duplicate
// but could also be just in notes in qa-testing comments

attached screen shows firefox window was drawn to height of htop window (htop being on laptop's lower resolution internal display), and the wasted/unused space on 2nd monitor as background (for 2nd display - laptop doesn't have this).

This bug is low importance, I can re-size manually to use space, and I don't believe I have the issue where both screens have the same resolution (from memory; I can confirm/re-test if worthwhile).

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: lxqt-session 0.13.0-0ubuntu2
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic i686
ApportVersion: 2.20.10-0ubuntu14
Architecture: i386
CasperVersion: 1.401
CurrentDesktop: LXQt
Date: Thu Dec 20 03:33:08 2018
LiveMediaBuild: Lubuntu 19.04 "Disco Dingo" - Alpha i386 (20181219)
SourcePackage: lxqt-session
UpgradeStatus: No upgrade log present (probably fresh install)

Chris Guiver (guiverc) wrote :
Chris Guiver (guiverc) wrote :
Ubuntu QA Website (ubuntuqa) wrote :

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

A list of all reports related to this bug can be found here:

tags: added: iso-testing
Chris Guiver (guiverc) wrote :

QA-test on x86_64 machine "hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)" and very similiar behavior so I won't create new bug-report; I'm adding here.

Reporting another bug had me run `ubuntu-bug`.. which opened `firefox` on 2nd monitor; it opened full width of monitor but occupied only about 1/8th of vertical position of monitor, meaning I could see only panel [of firefox], tabs, url line but no real page ('ubuntu one' asking for my login when window was expanded).

Clicking maximize (as toggle) would not maximize it, but switch between a usual-window size & full-width-but-tiny-vertical. This strange behavior occurs only on 2nd display!

I have two 1920x1080 resolution monitors (not differing resolutions), positioned vertically (one above the other).

I've taken screendumps, but will add shortly as I'm typing this on machine to right of box.

Chris Guiver (guiverc) wrote :

qa-test on x86_64 - firefox window when unmaximized on display 2

( if you click on the maximize button on the top border of the window it toggles between this state & that shown in the next attached picture - next comment)

Chris Guiver (guiverc) wrote :

see prior comment please too

firefox window on 2nd (bottom) display maximized or fullscreen - it's at top of bottom monitor, full width but using minimal real-estate. If the maximize window button is clicked, the window toggles between this position and what I consider normal 'window' position shown in prior comment picture

Chris Guiver (guiverc) wrote :
Chris Guiver (guiverc) on 2019-01-18
summary: - lubuntu 19.04 two displays (different res.), firefox maximized uses only
- part of 2nd display
+ lubuntu 19.04 two displays, firefox maximized uses only part of 2nd
+ display
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