From 7d9745cf239ca98cf1f694bff4765a276b05ee68 Mon Sep 17 00:00:00 2001 From: Henrique de Moraes Holschuh Date: Sun, 16 May 2010 19:45:57 -0300 Subject: [PATCH] thinkpad-acpi: document backlight level writeback at driver init Document this, it is no fun to try to second guess why this sort of stuff is in place years after it was added... Signed-off-by: Henrique de Moraes Holschuh --- drivers/platform/x86/thinkpad_acpi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index b3bfce9..4bdb137 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -6397,6 +6397,10 @@ static int __init brightness_init(struct ibm_init_struct *iibm) "or not on your ThinkPad\n", TPACPI_MAIL); } + /* Added by mistake in early 2007. Probably useless, but it could + * be working around some unknown firmware problem where the value + * read at startup doesn't match the real hardware state... so leave + * it in place just in case */ backlight_update_status(ibm_backlight_device); vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_BRGHT, -- 2.7.4