diff options
| author | Stefan Bader <stefan.bader@canonical.com> | 2009-08-21 11:03:05 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-10-13 02:50:38 -0400 |
| commit | 3a1151e3f124fd1a2c54b8153f510f1a7c715369 (patch) | |
| tree | 26c7155074db312ecd103f2d0ca3bdc450586539 /drivers/acpi | |
| parent | 161291396e76e0832c08f617eb9bd364d1648148 (diff) | |
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')
| -rw-r--r-- | drivers/acpi/video.c | 7 | ||||
| -rw-r--r-- | drivers/acpi/video_detect.c | 2 |
2 files changed, 7 insertions, 2 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; } diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 7032f25da9b5..575593a8b4e6 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -84,7 +84,7 @@ long acpi_is_video_device(struct acpi_device *device) return 0; /* Does this device able to support video switching ? */ - if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) && + if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) || ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy))) video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; |