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authorStefan Bader <stefan.bader@canonical.com>2009-08-21 13:03:05 +0400
committerLen Brown <len.brown@intel.com>2009-10-13 10:50:38 +0400
commit3a1151e3f124fd1a2c54b8153f510f1a7c715369 (patch)
tree26c7155074db312ecd103f2d0ca3bdc450586539 /drivers/acpi/video.c
parent161291396e76e0832c08f617eb9bd364d1648148 (diff)
downloadlinux-3a1151e3f124fd1a2c54b8153f510f1a7c715369.tar.xz
ACPI: video: Loosen strictness of video bus detection code
BugLink: http://bugs.launchpad.net/bugs/333386 Currently a video bus device must (beside other criteria) define _DOD and _DOS methods to be considered a video device. Some broken BIOSes prevented working backlight control by only defining both for one (non-existing bus) and only _DOD for the rest. With this patch in place the other bus definitions were considered too and backlight control started to work again. Signed-off-by: Stefan Bader <stefan.bader@canonical.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/video.c')
-rw-r--r--drivers/acpi/video.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f6e54bf8dd96..64e3c581b7a9 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1109,7 +1109,12 @@ static int acpi_video_bus_check(struct acpi_video_bus *video)
*/
/* Does this device support video switching? */
- if (video->cap._DOS) {
+ if (video->cap._DOS || video->cap._DOD) {
+ if (!video->cap._DOS) {
+ printk(KERN_WARNING FW_BUG
+ "ACPI(%s) defines _DOD but not _DOS\n",
+ acpi_device_bid(video->device));
+ }
video->flags.multihead = 1;
status = 0;
}