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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2010-05-16 19:45:57 -0300
committerHenrique de Moraes Holschuh <hmh@hmh.eng.br>2010-05-16 19:45:57 -0300
commit7d9745cf239ca98cf1f694bff4765a276b05ee68 (patch)
treecc550d94153eb9a5ac9b2ceb7b707cd43ad27862 /drivers/platform/x86
parentef07a5abadfcb2470fc9cbfbee0cb41076b4ba9b (diff)
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 <hmh@hmh.eng.br>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index b3bfce95383..4bdb13796e2 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,