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thinkpad-acpi: document backlight level writeback at driver init

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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>
This commit is contained in:
Henrique de Moraes Holschuh 2010-05-16 19:45:57 -03:00
parent ef07a5abad
commit 7d9745cf23
1 changed files with 4 additions and 0 deletions
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4
drivers/platform/x86/thinkpad_acpi.c
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@ -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,