thinkpad_acpi: fingers off backlight if video.ko is serving this functionality

Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 19 insertions, 10 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 4db1cf9078d9..7a4a26b0edd2 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -4932,16 +4932,25 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
          */
         b = tpacpi_check_std_acpi_brightness_support();
         if (b > 0) {
-                if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) {
-                        printk(TPACPI_NOTICE
-                               "Lenovo BIOS switched to ACPI backlight "
-                               "control mode\n");
-                }
-                if (brightness_enable > 1) {
-                        printk(TPACPI_NOTICE
-                               "standard ACPI backlight interface "
-                               "available, not loading native one...\n");
-                        return 1;
+
+                if (acpi_video_backlight_support()) {
+                        if (brightness_enable > 1) {
+                                printk(TPACPI_NOTICE
+                                       "Standard ACPI backlight interface "
+                                       "available, not loading native one.\n");
+                                return 1;
+                        } else if (brightness_enable == 1) {
+                                printk(TPACPI_NOTICE
+                                       "Backlight control force enabled, even if standard "
+                                       "ACPI backlight interface is available\n");
+                        }
+                } else {
+                        if (brightness_enable > 1) {
+                                printk(TPACPI_NOTICE
+                                       "Standard ACPI backlight interface not "
+                                       "available, thinkpad_acpi native "
+                                       "brightness control enabled\n");
+                        }
                 }
         }