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-rw-r--r--drivers/acpi/video.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 1f1625c51003..9730ec167590 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -162,6 +162,7 @@ struct acpi_video_device_cap {
162 u8 _BCL:1; /*Query list of brightness control levels supported */ 162 u8 _BCL:1; /*Query list of brightness control levels supported */
163 u8 _BCM:1; /*Set the brightness level */ 163 u8 _BCM:1; /*Set the brightness level */
164 u8 _BQC:1; /* Get current brightness level */ 164 u8 _BQC:1; /* Get current brightness level */
165 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
165 u8 _DDC:1; /*Return the EDID for this device */ 166 u8 _DDC:1; /*Return the EDID for this device */
166 u8 _DCS:1; /*Return status of output device */ 167 u8 _DCS:1; /*Return status of output device */
167 u8 _DGS:1; /*Query graphics state */ 168 u8 _DGS:1; /*Query graphics state */
@@ -523,8 +524,10 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
523{ 524{
524 acpi_status status = AE_OK; 525 acpi_status status = AE_OK;
525 526
526 if (device->cap._BQC) { 527 if (device->cap._BQC || device->cap._BCQ) {
527 status = acpi_evaluate_integer(device->dev->handle, "_BQC", 528 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
529
530 status = acpi_evaluate_integer(device->dev->handle, buf,
528 NULL, level); 531 NULL, level);
529 if (ACPI_SUCCESS(status)) { 532 if (ACPI_SUCCESS(status)) {
530 if (device->brightness->flags._BQC_use_index) { 533 if (device->brightness->flags._BQC_use_index) {
@@ -544,8 +547,8 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
544 * ACPI video backlight still works w/ buggy _BQC. 547 * ACPI video backlight still works w/ buggy _BQC.
545 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 548 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
546 */ 549 */
547 ACPI_WARNING((AE_INFO, "Evaluating _BQC failed")); 550 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
548 device->cap._BQC = 0; 551 device->cap._BQC = device->cap._BCQ = 0;
549 } 552 }
550 } 553 }
551 554
@@ -861,6 +864,12 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
861 } 864 }
862 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1))) 865 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
863 device->cap._BQC = 1; 866 device->cap._BQC = 1;
867 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
868 &h_dummy1))) {
869 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
870 device->cap._BCQ = 1;
871 }
872
864 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) { 873 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
865 device->cap._DDC = 1; 874 device->cap._DDC = 1;
866 } 875 }