When switching with a KVM, display resolution is not detected at first

[Steven Pemberton]

I have two Ubuntu 12.04 machines attached to a 2048x1152 screen via a KVM switch.

Each time I switch it comes up with the wrong resolution, *until* I click on System Settings>Displays, when it suddenly and with no further action on my behalf correctly identifies the display and sets the right resolution. (It may only happen after Ubuntu has locked the screen after a timeout)

As far as I recall, this is new for 12.04. 11.10 did it right, giving the correct resolution on switching with no further action required.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,snap,place,vpswitch,session,resize,grid,regex,move,mousepoll,imgpng,gnomecompat,animation,wall,unitymtgrabhandles,fade,expo,workarounds,scale,ezoom,unityshell]
CompositorRunning: compiz
Date: Thu Jun 7 15:01:55 2012
DistUpgraded: 2012-04-26 20:56:56,950 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:0009]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: TOSHIBA PORTEGE Z835
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=234865dc-97a3-4cf3-9932-254dd6cd6b11 ro quiet splash acpi_osi=Linux acpi_backlight=vendor pcie_aspm=force i915.i915_enable_rc6=1 i915.lvds_downclock=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to precise on 2012-04-26 (41 days ago)
dmi.bios.date: 10/19/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 1.30
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.30:bd10/19/2011:svnTOSHIBA:pnPORTEGEZ835:pvrPT224U-001001:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: PORTEGE Z835
dmi.product.version: PT224U-001001
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Launchpad Janitor (janitor)]

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

[Erick Brunzell (lbsolost)]

I think this may be a duplicate of bug 988290.