path: root/drivers/video/Makefile
diff options
authorLuming Yu <luming.yu@gmail.com>2007-05-09 21:07:05 +0800
committerLen Brown <len.brown@intel.com>2007-05-09 22:44:38 -0400
commit23b0f015bf2c050b8b5399430ca64e1b3398cf76 (patch)
tree9961a709908c3d8c7b4b4824f4c48327694e8764 /drivers/video/Makefile
parentDocumentation/i386/boot.txt: update and correct (diff)
ACPI: video: output switch sysfs support
Requires CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO. After loading output.ko and video.ko, you would have /sys/class/video_output and several device acpi_videoNum there. For example, I got acpi_video0, acpi_video1,acpi_video2,and acpi_video3 under /sys/class/video_output on my T40. I can query the status of output device0 by running " cat /sys/class/video_output/acpi_video0 " The return value is defined in ACPI SPEC B.5.5 _DCS(Return the Status of Output Device). Also you can turn off video1 and turn on video0 by " echo 0 > acpi_video1; echo 0x80000000 > acpi_video0". Please reference ACPI SPEC B.5.7 _DSS for the parameter definition. Please note that it may or may NOT works purely depending on if your vendor providing correct ACPI video extension support in bios. the driver output.ko and video.ko just works like a interface to invoke BIOS. Signed-off-by: Luming Yu <Luming.yu@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/video/Makefile')
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index a916c204274f..08b7c26a5734 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -119,3 +119,6 @@ obj-$(CONFIG_FB_OF) += offb.o
# the test framebuffer is last
obj-$(CONFIG_FB_VIRTUAL) += vfb.o
+#video output switch sysfs driver