Just wanted to say this is fixed now. I am running 3.11.0-14-lowlatency
and the bug is gone.
** Changed in: linux-lowlatency (Ubuntu)
Status: Confirmed = Fix Released
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Hi Kaj,
Just done some more testing and only 2 of the 3 patches are needed:
http://www.mail-archive.com/linux-usb@vger.kernel.org/msg23832.html
and:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1191603/+attachment/3761476/+files
/ehci-iso-accept
If these 2 are applied, the other patch
Have you tried these patches yourself?
I'll investigate them during the end of this week and build a kernel for
testing.
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Title:
3.8.x low
Yes. I have tested all of them. I am not certain the authors of the
patches agree they are the definitive solution tho. I will try to find
out their opinion on including them in a release. J
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Here are some patches that fix/work around this bug:
http://www.mail-archive.com/linux-usb@vger.kernel.org/msg23832.html
(to work around a bug in the focusrite 2i4 reporting the wrong
wMaxPacketSize)
http://www.spinics.net/lists/linux-usb/msg90457.html
(to allow startup of jackd at lower
Just discovered this bug actually appears between 3.6.11 and 3.7.0, so I
don't think it is related to the change in usb-ehci code.
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Title:
3.8.x
Jori - what is the difference between your laptop and desktop in terms
of USB hardware? Maybe that might be the cause??
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Title:
3.8.x low
I'm affected by what's very likely to be the same issue. This doesn't
seem to affect all hardware configurations. My laptop can handle jackd
with a latency of 32 samples on my Focusrite Scarlett 2i2 and 3.8.0-25
lowlatency kernel. On my desktop jackd won't even start with a latency
of less than
There's a new linux-lowlatency now in the proposed pocket with the mentioned
commit added.
In order to try it out, you'll need to enable proposed in
/etc/apt/sources.list, or by using software-sources-gtk.
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Unfortunately this doesn't fix it., so the patch must not be enough.
I noticed I get the following error message while jackd is failing to
start:
cannot submit urb (err = -18)
And I think this bug is probably related to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1191603
James
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The patch was included in one of the recent updates of the kernel. Did
it fix the problem?
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Title:
3.8.x low latency kernels poor performance
Ah - I didn't realise - but no - I am running 3.8.0-25-lowlatency and it
still shows the same problems.
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Title:
3.8.x low latency kernels poor
I've just checked the 3.8.0-25 source (not lowlatency I assume) and
there is no evidence of this patch having been applied.
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Title:
3.8.x low
On Tue, Jun 18, 2013, at 04:08 PM, James Stone wrote:
I've just checked the 3.8.0-25 source (not lowlatency I assume) and
there is no evidence of this patch having been applied.
You're right. Let's make that happen. I'll get a kernel built with the
patch shortly.
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On Tue, Jun 18, 2013, at 04:45 PM, Kaj Ailomaa wrote:
On Tue, Jun 18, 2013, at 04:08 PM, James Stone wrote:
I've just checked the 3.8.0-25 source (not lowlatency I assume) and
there is no evidence of this patch having been applied.
You're right. Let's make that happen. I'll get a
This is the patch to fix this:
http://git.kernel.org/linus/e194401783
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Title:
3.8.x low latency kernels poor performance with usb
To manage
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-lowlatency (Ubuntu)
Status: New = Confirmed
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** Package changed: linux-meta-lowlatency (Ubuntu) = linux-lowlatency
(Ubuntu)
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Title:
3.8.x low latency kernels poor performance with usb
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