Public bug reported:

affected hardware: Surface pro

No login possible, when the power cable is not attached.

Symptom: If the power cable not attached, ubuntu goes in freeze status
after login screen is visible.

see here "http://www.htxt.co.za/2013/09/17/ubuntu-13-10-on-the-surface-
pro/"

I have installed the final 13.10 Release.

Workaround: Ubuntu must started with attached power cable.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified: 
boot/vmlinuz-3.11.0-12-generic]
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  grazi      1766 F.... pulseaudio
Date: Sun Oct 27 12:47:19 2013
HibernationDevice: RESUME=UUID=a2c20574-6ca5-4b0c-b7aa-83cbc3f75f7f
InstallationDate: Installed on 2013-10-26 (0 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Microsoft Corporation Surface with Windows 8 Pro
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic  N/A
 linux-firmware                             1.116
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/20/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.0050
dmi.board.asset.tag: 0
dmi.board.name: Surface with Windows 8 Pro
dmi.board.vendor: Microsoft Corporation
dmi.board.version: 1
dmi.chassis.asset.tag: 0
dmi.chassis.type: 17
dmi.chassis.vendor: Microsoft Corporation
dmi.chassis.version: 1
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.05.0050:bd08/20/2013:svnMicrosoftCorporation:pnSurfacewithWindows8Pro:pvr1:rvnMicrosoftCorporation:rnSurfacewithWindows8Pro:rvr1:cvnMicrosoftCorporation:ct17:cvr1:
dmi.product.name: Surface with Windows 8 Pro
dmi.product.version: 1
dmi.sys.vendor: Microsoft Corporation

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug saucy

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https://bugs.launchpad.net/bugs/1245165

Title:
  Ubuntu 13.10 boot only with attached power cable.

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