Bug 86521 uncovered that some TOS6208 devices also return
non zero values on a write call to the backlight method,
thus getting caught and bailed out by the extra check code.
This patch makes sure that the extra check is being done
on a TOS1900 device and then make the check for the broken
backlight code.
Signed-off-by: Azael Avalos <coproscef...@gmail.com>
---
drivers/platform/x86/toshiba_acpi.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/x86/toshiba_acpi.c
b/drivers/platform/x86/toshiba_acpi.c
index ef3a190..e3fed12 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -944,9 +944,13 @@ static int set_lcd_brightness(struct toshiba_acpi_dev
*dev, int value)
/* Extra check for "incomplete" backlight method, where the AML code
* doesn't check for HCI_SET or HCI_GET and returns TOS_SUCCESS,
* the actual brightness, and in some cases the max brightness.
+ * Use the SPFC method as an indicator that we're on a TOS1900 device,
+ * otherwise some TOS6208 devices might get bailed out, see bug 86521
*/
- if (out[2] > 0 || out[3] == 0xE000)
- return -ENODEV;
+ if (acpi_has_method(dev->acpi_dev->handle, "SPFC")) {
+ if (out[2] > 0 || out[3] == 0xE000)
+ return -ENODEV;
+ }
return out[0] == TOS_SUCCESS ? 0 : -EIO;
}
--
2.1.1
--
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