Date: Fri, 20 Jun 2003 09:44:18 -0400 From: Jesse Guardiani <jesse@wingnet.net> To: freebsd-current@freebsd.org Subject: Re: APM problem in 5.1-RELEASE Message-ID: <bcv33b$1fb$1@main.gmane.org> References: <bcst0u$6mj$1@main.gmane.org> <200306191916.MAA15640@mina.soco.agilent.com> <bct4qh$2ck$1@main.gmane.org> <bctf00$l7c$1@main.gmane.org> <bctfh8$mem$1@main.gmane.org>
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Jesse Guardiani wrote:
> Jesse Guardiani wrote:
>
>> Jesse Guardiani wrote:
>>
>>> Darryl Okahata wrote:
>>>
>>>> Jesse Guardiani <jesse@wingnet.net> wrote:
>>
>> [...]
>>
>>> Now, if I can just get that lousy CD-ROM to not crash my system on
>>> resume I'll be a VERY happy man...
I did some more testing on this last night, and it appears that
the atacontrol detach method _does_ work, but only in specialized
circumstances.
I have modified my /etc/rc.suspend to call 'atacontrol detach 1'
_before_ it calls 'apm -z'. I have also modified my /etc/rc.resume
to call 'atacontrol attach 1' _after_ syncing the disks. If anyone
wants to have a look at these files, just let me know.
When it works:
--------------
1.) I have to be looking at a VTY, not X. (Geez. Just when I thought
I got around this with the kernel option SC_NO_SUSPEND_VTYSWITCH...)
2.) The /dev/acd0 device has to be unused, otherwise the kernel panics.
This means I have to stop playing any CDs and terminate the CD playing
program. I assume this means that the device has to be _not_ open,
but I haven't really performed much testing in this area.
When it doesn't work:
---------------------
1.) If I try to suspend while looking at X, the kernel panics and auto-
reboots.
2.) If I try to suspend while anything is accessing the acd0 device the
kernel panics and auto-reboots.
Those things aside, I can usually suspend my machine within 8 seconds, as
long as the hard disk isn't under high load. And it comes back on-line in
under 3 seconds. I've tested this 6 or 7 times in a row, swapping back and
forth from X before doing the next suspend, so I'm pretty confident that
it's reliable.
A plus is that the little green "drive in use" light on the side of my
Ultrabay goes off when the machine is in suspend mode, and since I call:
atacontrol attach 1
Upon resume from suspend, I could very easily swap out my drives while in
suspend mode. I've tested this. Pretty neat!
Things I would like to improve upon:
------------------------------------
1.) I need to find some way to automatically kill any processes that are
using (or have opened) the /dev/acd0 device BEFORE executing apm -z
from /etc/rc.suspend.
If I can accomplish that, then I will have successfully eliminated the
"stupid human" factor that sometimes causes me to forget I have a
program running that uses the /dev/acd0 device.
Does anyone have any ideas here?
2.) I'd love to automate (or do away with) the process of switching to
a VTY from X before executing 'atacontrol detach 1'.
Can anyone give me a _reason_ why I have to do that? It just seems
odd to me.
Thanks!
--
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v) 423-559-5145 (f)
http://www.wingnet.net
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