[mythtv-users] Video suspend issues with EPIA M10000/Unichrome

Jason Knisley knisleyjw at yahoo.com
Mon Mar 12 21:06:48 UTC 2007

--- migmog <migmog at gmail.com> wrote:

> I had the same problem, and found that it had to do
> with Wake on LAN
> being enabled when I suspended. I had the following
> line in my suspend
> script
> /usr/sbin/ethtool -s eth0 wol g
> ... and my video was pretty juddery.  When I
> commented out that line
> the problems went away. I did not spend any more
> time getting to the
> bottom of the problem, as I could never get Wake On
> LAN working from
> the Suspended state anyway.  Maybe you need to
> explicitly disable WOL
> with 'ethtool -s eth0 wol d'
> I also had to do various things in my suspend
> script:
> - I have a separate backend. I had to kill
> mythfrontend on the Epia,
> otherwise the backend would never go to sleep
> - I had to rmmod the kernel modules for my serial IR
> receiver before
> suspend, or it would not work when it came back up.
> - ... and modprobe them again after waking up
> - ... and do /etc/init.d/lirc start
> - ... and also do "DISPLAY=:0 irxevent $LIRCRC &"...
> the gotcha being
> that DISPLAY was not set in the context of the sleep
> script.
> That's about it. My Epia box sleeps in about 8 secs,
> and wakes up in
> about the same amount of time. I measured the power
> it uses in this
> state - about 3W... pretty much the same as when
> switched OFF but
> still with the power lead connected. IMHO this is a 
> shocking waste of
> power, but still much better than leaving it on!!

OMG! It *did* help, but in a slightly different way..

So I looked through the acpi suspend scripts, as well
as even the init scripts, and I couldn't find a
reference to WOL being turned on. I was going to add
something to explicitly disable it, but I remembered
WOL was disabled in the BIOS, so I wondered if maybe
the explicit enable in Linux that might be somewhere
might do something...

Turning WOL on in the BIOS (Power
Management->Peripherals->Wake On Lan/Ring) fixed it!

Thanks so much for the pointers; I don't think I
would've figured it out otherwise.. And certainly not
without a lot of beating at Unichrome.


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