linux-kernel - Re: bug: acpi ata_bay dock reminds undocked

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Message-ID: <2146960.E8Lje2UBps@vostro.rjw.lan>
Date:	Tue, 29 Apr 2014 22:55:07 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Shaohua Li <shaohua.li@...el.com>, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: bug: acpi ata_bay dock reminds undocked

On Tuesday, April 29, 2014 10:16:41 PM Pali Rohár wrote:
> Hello,

Hi,

> I have problem with sysfs entry docked
> 
> /sys/bus/platform/devices/dock.0/docked
> 
> for my media bay DVD drive on notebook Dell Latitude E6440.
> 
> After booting linux kernel docked is set to 1 (which is correct, 
> DVD hw is inserted into sata dock). When I undock it via sysfs 
> entry
> 
> /sys/bus/platform/devices/dock.0/undock
> 
> then kernel remove DVD device from system (no /dev/sr0 anymore) 
> and docked sysfs entry is set to 0.
> 
> When I press eject button on DVD drive, I hear some spin up and 
> kernel detect DVD device again (also udev create /dev/sr0). But 
> docked sysfs entry remains set to 0. It will never be set back to 
> 1 - only after reboot.
> 
> So this looks like bug somewhere and probably in linux acpi dock 
> driver... Do you know to solve this problem? More applications 
> checking docked sysfs entry for dock presence and returning 0 
> will mislead them.
> 
> Here is some info from sysfs about dock:
> 
> $ grep "" /sys/bus/platform/devices/dock.0/*
> /sys/bus/platform/devices/dock.0/docked:0
> /sys/bus/platform/devices/dock.0/flags:32
> /sys/bus/platform/devices/dock.0/modalias:acpi:LNXIOBAY:
> /sys/bus/platform/devices/dock.0/type:ata_bay
> /sys/bus/platform/devices/dock.0/uevent:MODALIAS=acpi:LNXIOBAY:
> 
> If you need some more info let me know. I would be happy to have 
> working docked sysfs entry.

Which kernel version(s) have you tried?


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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