External monitor doesn't work on Toshiba Portege R600

In summary, when an external monitor is not connected at boot, I can't
get the laptop to drive an external monitor. This is a problem in
Ubuntu Lucid (10.04) but it was not a problem in the Ubuntu Hardy
(8.04).

This appears to be a problem with the mainline kernel. I have
submitted a report at:
https://bugzilla.kernel.org/show_bug.cgi?id=31292

WORKAROUND: In the BIOS change "Power on Display" from "auto-selected" to "LCD+Analog RGB".

External monitor not connected at boot
--------------------------------------

* External monitor can be seen in "Monitor preferences", but laptop
  does not drive external monitor

$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
VGA1 connected (normal left inverted right x axis y axis)
   1360x768 59.8
   1024x768 60.0
   800x600 60.3 56.2
   848x480 60.0
   640x480 59.9 59.9
LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800 60.2*+
   1024x768 85.0 75.0 70.1 60.0
   832x624 74.6
   800x600 85.1 72.2 75.0 60.3 56.2
   640x480 85.0 72.8 75.0 59.9
   720x400 85.0
   640x400 85.1
   640x350 85.1
DVI1 disconnected (normal left inverted right x axis y axis)

* "Mirror screens" in "Monitor preferences" appears to switch
  resolution, but the external monitor is not driven. In this case
  xrandr reports:

$ xrandr -q
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1360x768 59.8
   1024x768 60.0*
   800x600 60.3 56.2
   848x480 60.0
   640x480 59.9 59.9
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800 60.2 +
   1024x768 85.0 75.0 70.1 60.0*
   832x624 74.6
   800x600 85.1 72.2 75.0 60.3 56.2
   640x480 85.0 72.8 75.0 59.9
   720x400 85.0
   640x400 85.1
   640x350 85.1
DVI1 disconnected (normal left inverted right x axis y axis)

* I can't use toshset to connect external monitor:

$ sudo toshset -video both

This makes the screen go blank and the external monitor is not
driven. I can recover switching to VT1 and typing "sudo toshset -video int".

* Changning the output using the proc file system does not appear to
  work as it should (See http://memebeam.org/toys/ToshibaAcpiDriver
  and http://memebeam.org/toys/ToshibaAcpiVideo) :

# cat /proc/acpi/toshiba/video
lcd_out: 1
crt_out: 0
tv_out: 0
# echo "crt_out:1" > /proc/acpi/toshiba/video
# cat /proc/acpi/toshiba/video
lcd_out: 1
crt_out: 0
tv_out: 0

Workaround: External monitor connected at boot
----------------------------------------------

The external screen is driven automatically. The resolution of the
laptop screen is adjusted to match the external monitor.

It's not possible to turn off the monitor using the proc filesystem:

# cat /proc/acpi/toshiba/video
lcd_out: 0
crt_out: 1
tv_out: 0
root@bancroftmill:/home/dcs# echo "crt_out:0" > /proc/acpi/toshiba/video
root@bancroftmill:/home/dcs# cat /proc/acpi/toshiba/video
lcd_out: 0
crt_out: 1
tv_out: 0

It is possible to switch using the "Monitor preferences" tool.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-30-generic 2.6.32-30.59
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-30.59-generic 2.6.32.29+drm33.13
Uname: Linux 2.6.32-30-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: dcs 2390 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xbf200000 irq 22'
   Mixer name : 'Realtek ALC262'
   Components : 'HDA:10ec0262,11790606,00100302'
   Controls : 20
   Simple ctrls : 13
Date: Tue Apr 5 15:11:15 2011
HibernationDevice: RESUME=UUID=8cdee96f-4c75-439c-967e-c0ace1b51b4b
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: TOSHIBA PORTEGE R600
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-30-generic root=UUID=3bce9d42-0ffe-42c9-ab7a-28852d116dde ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.4
SourcePackage: linux
dmi.bios.date: 10/23/2008
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 1.50
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:bvrVersion1.50:bd10/23/2008:svnTOSHIBA:pnPORTEGER600:pvrPPR61E-00Q00CEN:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: PORTEGE R600
dmi.product.version: PPR61E-00Q00CEN
dmi.sys.vendor: TOSHIBA