Some buggy BIOSes implements _BCQ instead of _BQC.
Male ACPI video driver support these buggy BIOS.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/acpi/video.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
Index: linux-2.6/drivers/acpi/video.c
===================================================================
--- linux-2.6.orig/drivers/acpi/video.c 2009-03-17 14:54:20.000000000 +0800
+++ linux-2.6/drivers/acpi/video.c 2009-03-17 14:56:17.000000000 +0800
@@ -162,6 +162,7 @@
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_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 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 @@
}
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;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
