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This remains with a different kernel (3.11) and a totally different
laptop, bios and trackball (though it's an identical model - I have
two). I don't think the model is that relevant, as it also applies to a
generic USB keyboard I'm using.

I'm now in a position to replicate the bug on two different laptops - a
Toshiba R600 and a Dell N5110 eliminating the BIOS issue as a possible
cause I think.

It's been a latent bug for me as it's a rare occasion that I'm using
external keyboard and trackball WITHOUT power - normally those things go
together when I'm docked at a desk in the office. However, I just
rediscovered the bug when a colleague removed my power without me
noticing.

Another line of investigation is the use of powertop scripts for auto-unloading of USB modules as listed in the duplicate bug I've filed...
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1215476
...though this is expected to 'just work' and indeed the bug remains even when auto-unloading is explicitly deactivated (though there may be a bug there I suppose - the power/control sys bus files report that the unloading config has changed from 'auto' to 'on', but it still seems to disconnect the devices).

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https://bugs.launchpad.net/bugs/1060029

Title:
  Wired trackball fails while on battery power (module unload issue?)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have a wired trackball which identifies itself through lsusb as...

  Bus 003 Device 013: ID 047d:1022 Kensington Orbit Optical

  This device is perfectly functional when my Dell Q15R (N5110) is
  powered from the mains, but when running on battery, the device lasts
  something like 10 seconds before being disabled.

  Unplugging and replugging the trackball gets you another 10 seconds.
  Keeping moving the pointer can sustain the function of the trackball,
  until you leave the pointer still for 10 seconds, and then it's
  disabled.

  Plugging the mains back in and replugging the trackball means the
  trackball keeps functioning indefinitely.

  I don't know what kind of power module unload is built in to 12.04. Is
  it possible that something is being unloaded which shouldn't be? Any
  suggestions for workarounds? I'd really like to be able to use my
  trackball when running on battery.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-31-generic-pae 3.2.0-31.50
  ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
  Uname: Linux 3.2.0-31-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  cefn       3039 F.... pulseaudio
   /dev/snd/controlC0:  cefn       3039 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf7b00000 irq 55'
     Mixer name	: 'IDT 92HD87B1/3'
     Components	: 'HDA:111d76d1,102804b0,00100205'
     Controls      : 17
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xf6080000 irq 17'
     Mixer name	: 'Nvidia GPU 14 HDMI/DP'
     Components	: 'HDA:10de0014,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Tue Oct  2 08:31:10 2012
  HibernationDevice: RESUME=UUID=cc61e7ac-1394-458b-8963-4731567fabad
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423.2)
  MachineType: Dell Inc. Inspiron N5110
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 nouveaufb
   1 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic-pae root=UUID=c9767810-263a-424a-80cd-714fd4a9afa1 ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/cefn not ours.
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-31-generic-pae N/A
   linux-backports-modules-3.2.0-31-generic-pae  N/A
   linux-firmware                                1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/22/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0HVRTT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd03/22/2012:svnDellInc.:pnInspironN5110:pvrNotSpecified:rvnDellInc.:rn0HVRTT:rvrA10:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron N5110
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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