Multi monitor mirrored instead of using primary/selected monitor

Bug #959592 reported by Terry on 2012-03-19
This bug affects 13 people
Affects Status Importance Assigned to Milestone
GNOME Settings Daemon
gnome-settings-daemon (Ubuntu)

Bug Description

When lightdm starts after rebooting or switching on, I'm greeted with the login which is mirrored on both of my displays and the primary monitor resolution is reduced from widescreen to a 4:3 resolution. If I replug the external monitor, the display is no longer mirrored and the correct resolution is displayed on the primary monitor. I also get the Ubuntu logo in the centre of the external display of which I assume is the correct behaviour. This is on a Lenovo G570 notebook.

$ sudo lspci -vv
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
 Subsystem: Lenovo Device 3975
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 41
 Region 0: Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
 Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at 3000 [size=64]
 Expansion ROM at <unassigned> [disabled]
 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee0c00c Data: 4161
 Capabilities: [d0] Power Management version 2
  Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [a4] PCI Advanced Features
  AFCap: TP+ FLR+
  AFCtrl: FLR-
  AFStatus: TP-
 Kernel driver in use: i915
 Kernel modules: i915

 $ lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04

$ apt-cache policy lightdm
  Installed: 1.1.8-0ubuntu1
  Candidate: 1.1.8-0ubuntu1
  Version table:
 *** 1.1.8-0ubuntu1 0
        500 precise/main amd64 Packages
        100 /var/lib/dpkg/status

Terry (terry-kryogenic) wrote :
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lightdm (Ubuntu):
status: New → Confirmed
Sebastien Bacher (seb128) wrote :

Thank you for your bug report, I can confirm that with a docked laptop using the laptop screen and an external monitor, on user change the screen is in mirror, reconnecting the external monitor triggers an update and put the greeter in the right mode

affects: lightdm (Ubuntu) → unity-greeter (Ubuntu)
Changed in unity-greeter (Ubuntu):
importance: Undecided → High
Changed in unity-greeter (Ubuntu Precise):
assignee: nobody → Robert Ancell (robert-ancell)
Sebastien Bacher (seb128) wrote :

Reassigning to gsd after discussion with Robert

affects: unity-greeter (Ubuntu) → gnome-settings-daemon (Ubuntu)
Changed in gnome-settings-daemon (Ubuntu):
assignee: Robert Ancell (robert-ancell) → nobody
affects: unity-greeter → gnome-settings-daemon
Changed in gnome-settings-daemon (Ubuntu Precise):
assignee: Robert Ancell (robert-ancell) → nobody
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