[Bugme-new] [Bug 31292] New: No external video output with Toshiba Portege R600 unless attached at boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=31292

           Summary: No external video output with Toshiba Portege R600
                    unless attached at boot
           Product: ACPI
           Version: 2.5
    Kernel Version: 2.6.38
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
        AssignedTo: acpi_power-video at kernel-bugs.osdl.org
        ReportedBy: david.c.sterratt at ed.ac.uk
        Regression: No


Created an attachment (id=51042)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=51042)
dmseg when screen not attached at boot

When I boot up my Toshiba Portege R600 laptop without being connected to an
external monitor, it seems to be impossible to switch the output to an external
monitor by pressing the "Video Button".  The ACPI signal send by the video
button is, according to acpi_listen:

video VGA 00000080 00000000

I have tried switching the output by writing to /proc/acpi/toshiba/video, but
it does not activate the output or even change the file:

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

The symptom of writing having no effect on /proc/acpi/toshiba/video is
mentioned here:
http://memebeam.org/toys/ToshibaAcpiVideo

I can drive an external monitor if I boot up attached to a monitor. Then the
video button toggles between just the laptop screen and both the screen and the
external monitor as usual. The contents of /proc/acpi/toshiba/video is
different:

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

But it cannot be changed:

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

I tried toshset with a patch to the toshiba_acpi module, but

toshset -video both

just gave a blank screen. The report here was generated with an unpatched
kernel. 

It would be great if this could be looked into, as it makes it awkward to give
presentations.

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