LightDM resolution on additional screen is not correctly set

[Thomas Barandon]

Hi,

This issue can be reproduced only when you add a second monitor with a different resolution (i.e additional screen on a laptop).
The lightdm selected resolution on the second screen is not correct and result to a really bad layout.
This issue occurs at the logon screen and also when the screen is locked.

Is it possible to implement a display setup script for lightdm using xrandr & auto conf ?

BR,

ProblemType: Bug
DistroRelease: elementary OS 0.3
Package: elementary-desktop 1.349+393~ubuntu0.3.1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
Uname: Linux 3.13.0-34-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
CrashDB: elementary_meta
CurrentDesktop: Pantheon
Date: Mon Aug 18 17:29:32 2014
InstallationDate: Installed on 2014-08-12 (6 days ago)
InstallationMedia: elementary OS 0.3 "Freya" - Daily amd64 (20140810)
ProcEnviron:
 LANGUAGE=fr
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: elementary-meta
SuspiciousXErrors: [WARNING:flash/platform/pepper/pep_module.cpp(63)] SANDBOXED
ThirdParty: True
UpgradeStatus: No upgrade log present (probably fresh install)

[wrksyn (wrksync+ubuntuone)]

I've gone through the following steps to solve this issue for me.

- create [1] '/usr/bin/fixlightdmxrandr.sh'

- execute 'xrandr' and find out the display you want to disable (INTERNAL_OUTPUT)

- modify '/usr/bin/fixlightdmxrandr.sh' accordingly

- edit [2] '/etc/lightdm/lightdm.conf' to include the '/usr/bin/fixlightdmxrandr.sh' script.

- reboot, or restart lightgdm

- hopefully enjoy your new fullscreen lightdm ;-)

[1] '/etc/lightdm/lightdm.conf'

<code>
[SeatDefaults]
allow-guest=false
display-setup-script=/usr/bin/fixlightdmxrandr.sh
session-setup-script=/usr/bin/fixlightdmxrandr.sh
</code>

[2] '/usr/bin/fixlightdmxrandr.sh'
<code>
#!/bin/sh
EXTERNAL_OUTPUT="HDMI2"
INTERNAL_OUTPUT="LVDS1"

xrandr |grep $EXTERNAL_OUTPUT | grep " connected "
if [ $? -eq 0 ]; then
    xrandr --output $INTERNAL_OUTPUT --off --output $EXTERNAL_OUTPUT --auto
else
    xrandr --output $INTERNAL_OUTPUT --auto --output $EXTERNAL_OUTPUT --off
fi
</code>

[Gamunu Balagalla (gamunu)]

Confirm affected by this bug. Previously, I had Ubuntu 16.04 installed although,
with Ubuntu I don't see this bug.

see: screenshot.png

Laptop display: 1366x768(16:9)
External monitor (HDMI): 1920x1280(16:9)

xrandr | fgrep '*'
   1366x768 60.00*+ 48.00
   1920x1080 60.00*+ 50.00 59.94

Graphic controller:
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
 DeviceName: Onboard IGD
 Subsystem: Dell Broadwell-U Integrated Graphics [1028:062e]
 Flags: bus master, fast devsel, latency 0, IRQ 48
 Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
 Memory at e0000000 (64-bit, prefetchable) [size=256M]
 I/O ports at f000 [size=64]
 Expansion ROM at <unassigned> [disabled]
 Capabilities: <access denied>
 Kernel driver in use: i915
 Kernel modules: i915

00:03.0 Audio device [0403]: Intel Corporation Broadwell-U Audio Controller [8086:160c] (rev 09)

System Information
 Manufacturer: Dell Inc.
 Product Name: Latitude E7450
 Version: Not Specified
 Wake-up Type: Power Switch
 Family: Not Specified

[Gamunu Balagalla (gamunu)]

For comment #3

Currently I'm running,

Distributor ID: elementary OS
Description: elementary OS Loki
Release: 0.4
Codename: loki