I've got a report of build failure on ideapad-laptop, which shows
drivers/built-in.o: In function `ideapad_acpi_notify':
ideapad-laptop.c:(.text+0x63876a): undefined reference to
`backlight_force_update'
drivers/built-in.o: In function `ideapad_acpi_remove':
ideapad-laptop.c:(.devexit.text+0x64a7): undefined reference to
`backlight_device_unregister'
drivers/built-in.o: In function `ideapad_acpi_add':
ideapad-laptop.c:(.devinit.text+0x45e28): undefined reference to
`backlight_device_register'
To select backlight subsystem can prevent this error from happening.
Also update comment for this driver.
Reported-by: Fengguang Wu <fengguang...@intel.com>
Signed-off-by: Ike Panhc <ike....@canonical.com>
---
drivers/platform/x86/Kconfig | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index c86bae8..c5bc068 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -291,8 +291,10 @@ config IDEAPAD_LAPTOP
depends on RFKILL && INPUT
depends on SERIO_I8042
select INPUT_SPARSEKMAP
+ select BACKLIGHT_CLASS_DEVICE
help
- This is a driver for the rfkill switches on Lenovo IdeaPad netbooks.
+ This is a driver for Lenovo IdeaPad netbooks contains drivers for
+ rfkill switch, hotkey, fan control and backlight control.
config THINKPAD_ACPI
tristate "ThinkPad ACPI Laptop Extras"
--
1.7.9.5
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