After updating the Raring system on my Lenovo T400 laptop today and rebooting into the new kernel (3.8.0-13) the screen size is not recognized any more and the screen comes up with 1024x768 default resolution. Booting into the previous kernel, 3.8.0-12 solves the problem.
/var/log/Xorg.0.log is attached.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-13-generic 3.8.0-13.22
ProcVersionSignature: Ubuntu 3.8.0-13.22-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: till 3374 F.... pulseaudio
Date: Mon Mar 18 11:24:28 2013
HibernationDevice: RESUME=UUID=9185f036-2e72-40e6-bf31-d9a8926a7883
MachineType: LENOVO 7417CTO
MarkForUpload: True
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-13-generic root=/dev/mapper/username-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-13-generic N/A
linux-backports-modules-3.8.0-13-generic N/A
linux-firmware 1.104
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2012-10-19 (149 days ago)
dmi.bios.date: 10/13/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET79WW (3.09 )
dmi.board.name: 7417CTO
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:bvr7UET79WW(3.09):bd10/13/2009:svnLENOVO:pn7417CTO:pvrThinkPadT400:rvnLENOVO:rn7417CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7417CTO
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO
Workaround without rebooting into old kernel (but not solution):
Start System Settings and go into Displays section, turn off "Mirror displays". Then two displays appear side by side, the "Laptop" and "Unknown". "Laptop" is the internal display of the laptop (LVDS1), Unknown is the VGA connector for an external monitor (VGA1). No external monitor is connected. Set "Laptop" to its native resolution (1440x900 in my case) and turn off "Unknown".
Now it is possible to use the laptop standalone with its internal display at the correct resolution, but problems are:
1. The login screen is 1024x768
2. Manual intervention needed when connecting a projector.
So the regression from 3.8.0-12 to 3.8.0-13 needs to get fixed.