linux-kernel - Re: laptop reboots right after hibernation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <474D46C2.3000005@dbservice.com>
Date:	Wed, 28 Nov 2007 11:45:22 +0100
From:	Tomas Carnecky <tom@...ervice.com>
To:	Tejun Heo <htejun@...il.com>
CC:	Pavel Machek <pavel@....cz>, linux-ide@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: laptop reboots right after hibernation

Tejun Heo wrote:
> Tomas Carnecky wrote:
>> I kindof had suspected that. The docking station has an ultrabay slot
>> where I currently have a cdrom drive (since the notebook itself doesn't
>> have any cdrom drive. Once I took the cdrom drive out, I was able to
>> successfully perform what I wanted to do in points 3a and 5!
>>
>> The 'undock' button probably doesn't tell the kernel that it should
>> unload the cdrom driver. Even though after pressing the undock button
>> the drive becomes unusable (the green led that is on the side of the
>> ultrabay disables and it's impossible to open the tray). Though pressing
>> the undock button causes the usb ports to be removed from the kernel, at
>> least that's what dmesg suggests (I put the notebook into the dock,
>> waited a bit and then pressed the undock button):
> 
> That undock button generate an ACPI event, right?  You probably need
> to hook that ACPI event such that something like the following gets
> executed.
> 
> echo 1 > /sys/device/pci0000:00/0000:00:1f.1/host?/target?:?:?:?/?:?:?:?/delete"

I tried experimenting with echoing to [pci]/delete or [acpi]/undock and
various combinations but no luck.

>> The notebook+dock+STR works as long as the notebook doesn't know about
>> the ultrabay device. That can be because the notebook was started
>> outside of the docking station, or inside the docking station but with
>> the ultrabay removed. But once the notebook sees the ultrabay device
>> it's over. As little as one suspend/resume cycle inside the docking
>> station and with a ultrabay device plugged in is enough to make the
>> kernel (partially) recognize the device - the kernel doesn't recognize
>> the device as a cdrom drive, but only as an UDMA/33 device. After one
>> suspend/resume cycle I see this in dmesg:
> 
> Do you have sr_mod loaded?

Compiled into the kernel.

> Can you please post...
> 
> * full boot log with the ultra bay occupied.
> 
> * the result of "hdparm -I /dev/sr0" with the ultra bay occupied.
> 
> * the result of "lspci -nnvvv" with the ultra bay occupied.
> 
> * full boot log without docking station.
> 
> * the result of "lspci -nnvvv" without docking station.

attached

tom

View attachment "dmesg-with-ultrabay" of type "text/plain" (23531 bytes)

View attachment "dmesg-without-dock" of type "text/plain" (22616 bytes)

View attachment "lspci-with-ultrabay" of type "text/plain" (19789 bytes)

View attachment "lspci-without-dock" of type "text/plain" (19789 bytes)

View attachment "hdparam-dev-sr0" of type "text/plain" (582 bytes)