Is this a regression from 12.10? The modesetting code in the kernel got
rewritten for 3.7, so testing with 3.5 from quantal might make it work.
Also, try without the KVM box to see if it makes a difference.
What happens if you run 'xrandr --auto' from a terminal after attaching
the external screen?
** Package changed: xorg (Ubuntu) => xserver-xorg-video-intel (Ubuntu)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1083790
Title:
Connecting external monitor shows incorrect resolution on external
screen and correct resolution on laptop screen
Status in “xserver-xorg-video-intel” package in Ubuntu:
Incomplete
Bug description:
I have a Lenovo T520 and a Samsung LED monitor running in dual-monitor
mode (not mirrored). I also use an IOGEAR 2 Port USB Cable KVM Switch
with Audio and Mic (GCS72U) to share the screen with another machine,
although it is almost always just selecting the Lenovo laptop with the
screen.
When I am using the laptop without the external monitor everything
looks great, but then when I plug the external monitor in the
resolution on the monitor is incorrect and is low resolution as well
as the top panel being cut off a little (see the attached screenshot).
The resolution on the laptop screen is correct and the dual monitor
setting is correct (external screen on the left, laptop screen on the
right).
If I then load the displays applet in the Settings, the external
monitor switches to the correct resolution without me clicking on
anything in the displays applet (just loading it fixes the
resolution).
I also noticed today that if I plug in the external monitor (and thus
see the incorrect resolution) and leave it without going to the
displays applet, if I leave it for around 3 - 5 mins it will
automatically switch to the correct resolution without me doing
anything.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.7.0-3.9-generic 3.7.0-rc6
Uname: Linux 3.7.0-3-generic i686
.tmp.unity.support.test.0:
ApportVersion: 2.6.2-0ubuntu5
Architecture: i386
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Tue Nov 27 13:12:06 2012
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:21cf]
InstallationDate: Installed on 2012-11-24 (3 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20121123)
MachineType: LENOVO 4239CTO
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.7.0-3-generic
root=UUID=5fac2c6e-90ff-4e5a-a7d2-e4f1250e3039 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/06/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8AET56WW (1.36 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4239CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8AET56WW(1.36):bd12/06/2011:svnLENOVO:pn4239CTO:pvrThinkPadT520:rvnLENOVO:rn4239CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4239CTO
dmi.product.version: ThinkPad T520
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.8.4+bzr3412-0ubuntu1
version.libdrm2: libdrm2 2.4.40-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.13-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.4-0ubuntu1
xserver.bootTime: Tue Nov 27 10:44:47 2012
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.0-0ubuntu8
xserver.video_driver: intel
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