diff options
| -rw-r--r-- | Documentation/laptops/thinkpad-acpi.txt | 4 | ||||
| -rw-r--r-- | drivers/platform/x86/thinkpad_acpi.c | 42 |
2 files changed, 24 insertions, 22 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt index f6f80257addb..1565eefd6fd5 100644 --- a/Documentation/laptops/thinkpad-acpi.txt +++ b/Documentation/laptops/thinkpad-acpi.txt @@ -1024,6 +1024,10 @@ ThinkPad-specific interface. The driver will disable its native backlight brightness control interface if it detects that the standard ACPI interface is available in the ThinkPad. +If you want to use the thinkpad-acpi backlight brightness control +instead of the generic ACPI video backlight brightness control for some +reason, you should use the acpi_backlight=vendor kernel parameter. + The brightness_enable module parameter can be used to control whether the LCD brightness control feature will be enabled when available. brightness_enable=0 forces it to be disabled. brightness_enable=1 diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 9d6fc4c7c08e..b9430e887e95 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -6216,28 +6216,6 @@ static int __init brightness_init(struct ibm_init_struct *iibm) if (tp_features.bright_unkfw) return 1; - if (tp_features.bright_acpimode) { - 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"); - } - } - } - if (!brightness_enable) { dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_BRGHT, "brightness support disabled by " @@ -6245,6 +6223,26 @@ static int __init brightness_init(struct ibm_init_struct *iibm) return 1; } + if (acpi_video_backlight_support()) { + if (brightness_enable > 1) { + printk(TPACPI_INFO + "Standard ACPI backlight interface " + "available, not loading native one.\n"); + return 1; + } else if (brightness_enable == 1) { + printk(TPACPI_WARN + "Cannot enable backlight brightness support, " + "ACPI is already handling it. Refer to the " + "acpi_backlight kernel parameter\n"); + return 1; + } + } else if (tp_features.bright_acpimode && brightness_enable > 1) { + printk(TPACPI_NOTICE + "Standard ACPI backlight interface not " + "available, thinkpad_acpi native " + "brightness control enabled\n"); + } + /* * Check for module parameter bogosity, note that we * init brightness_mode to TPACPI_BRGHT_MODE_MAX in order to be |