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ACPI video: support buggy BIOSes with _BCQ implemented 

Some buggy BIOSes implements _BCQ instead of _BQC.
Male ACPI video driver support these buggy BIOS.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2009-03-18 16:27:18 +08:00 committed by Len Brown
parent 1a7c618a3f
commit c60d638e29
1 changed files with 13 additions and 4 deletions
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17
drivers/acpi/video.c
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@ -162,6 +162,7 @@ struct acpi_video_device_cap {
u8 _BCL:1; /*Query list of brightness control levels supported */
u8 _BCM:1; /*Set the brightness level */
u8 _BQC:1; /* Get current brightness level */
u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
u8 _DDC:1; /*Return the EDID for this device */
u8 _DCS:1; /*Return status of output device */
u8 _DGS:1; /*Query graphics state */
@ -523,8 +524,10 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
{
acpi_status status = AE_OK;
if (device->cap._BQC) {
status = acpi_evaluate_integer(device->dev->handle, "_BQC",
if (device->cap._BQC || device->cap._BCQ) {
char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
status = acpi_evaluate_integer(device->dev->handle, buf,
NULL, level);
if (ACPI_SUCCESS(status)) {
if (device->brightness->flags._BQC_use_index) {
@ -544,8 +547,8 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
* ACPI video backlight still works w/ buggy _BQC.
* http://bugzilla.kernel.org/show_bug.cgi?id=12233
*/
ACPI_WARNING((AE_INFO, "Evaluating _BQC failed"));
device->cap._BQC = 0;
ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
device->cap._BQC = device->cap._BCQ = 0;
}
}
@ -861,6 +864,12 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
device->cap._BQC = 1;
else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
&h_dummy1))) {
printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
device->cap._BCQ = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
device->cap._DDC = 1;
}