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-vi...@kernel-bugs.osdl.org
ReportedBy: david.c.sterr...@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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