[LAU] suspending with realtime kernel

Robin Gareus robin at gareus.org
Fri Apr 17 06:16:28 EDT 2009


Geoff King wrote:
>> I've been having a problem which isn't directly to do with audio—it's to
>> do with the Ubuntu realtime kernel—but I haven't got any answers from
>> the Ubuntu forums and this is a real showstopper as far as doing audio
>> work goes.
>  
> I've tried the ubuntu realtime kernel several times. I'm not suprised by your
> findings.  Check out these links. I would suggest you file a bug report to
> ubuntu launchpad.  
> 
> https://launchpad.net/ubuntu/+source/linux-rt/+bugs
> https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/138691
> 
> In my experience you can get a good rt system from ubuntu if you do some major
> tweaking, but then you might not like the desktop as much. If you could use a
> basic desktop system with no wireless that would help you figure this out. 
> 
> I remember playing with lots of changes such as removing NetworkManager,
> tracker, acpid, apmd, adding rtirq, and making changes to other system settings.
>  But that was a long time ago now. 


It depends on your hardware; but both 2.6.24.3-rt3 and 2.6.29.1-rt7
suspend and resume just fine with NetworkManager, avahi-daemon and acpid
running. - This is a debian/squeeze on a Thinkpad.


> Now since I don't really need realtime, I just use the generic kernel or one I
> compile from Ubuntu sources so that I can use rosegarden midi (1000HZ timer and
> low-latency desktop I think are the only changes).  I have no real need for
> realtime. 
> 
> Do you really need -rt for your work?
> 
> Good Luck. Geoff





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