Wouter1
commented
9 years ago Only Wouter1 can read the apple bug report because the way Apple handles bug reports. Also it's not clear if the report will be available in the future. This is not good for dealing with this issue.
Therefore I duplicate the contents here (I can't see the 'duplicate' ticket, which seems still open)
Apple Developer Relations07-Oct-2015 10:14 AM
Engineering has determined that your bug report is a duplicate of another issue and will be closed.
The open or closed status of the original bug report your issue was duplicated to appears in the yellow "Duplicate of XXXXXXXX" section of the bug reporter user interface. This section appears near the top of the right column's bug detail view just under the bug number, title, state, product and rank.
If you have any questions or concerns, please update your report directly here: http://bugreport.apple.com/.
Apple Developer Relations30-Sep-2015 07:57 PM
We believe this issue has been addressed in the OS X El Capitan 10.11 release. Please test with this release, and update this report with your results.
OS X 10.11
https://developer.apple.com/osx/download/
or
https://itunes.apple.com/app/os-x-yosemite/id1018109117Apple Developer Relations16-Jan-2015 10:36 PM
Engineering has the following feedback for you:
#define kIOReturnIsoTooNew iokit_common_err(0x2ef) // isochronous I/O request for distant future
Scheduling too far ahead in the future. Adjust your algorithm to take note of this error code.w pasman04-Oct-2015 11:10 PM
Thanks for your heads-up on this.
Unfortunately it seems exactly the other way round. I successfully worked around the issue on the previous versions of OSX to get it working properly. But I got user reports that my driver now breaks on El Capitan with read error e00002e7... I will wait installing El Capitan until it is considered stable (many audio drivers seem to have been broken)
Can you indicate what exactly has changed in the USB drivers as compared to Yosemite? That may help me finding a new workaround or better solution. I would like to have one solution that works on all machines to keep the driver compatible with previous versions of OSX.w pasman19-Jan-2015 08:43 AM
Some people also have reported the issue on Mavericks. So this is not an issue with Yosemite but with something else deep in the system, like the USB chipset?
Can I change the title of this ticket? "on Yosemite" should be "on some machines"w pasman18-Jan-2015 05:41 PM
Thanks for picking this up.
Yes I know what this error means.
The point is, with kAppleUSBSSIsocContinuousFrame I request the USB system to figure out the proper USB frame itself. So this error makes no sense it seems.w pasman06-Jan-2015 01:16 PM
We did a few tests on different machines with Yosemite
on rMBP 15" late 2013 it works fine, the read with kAppleUSBSSIsocContinuousFrame works as expected
on MacBook Pro Mid 2012 - 15" it does not work, giving reported error.
Both have a USB3 port according to the specs. Both running Yosemite.w pasman28-Dec-2014 10:02 AM
Summary:
I'm developing a kernel extension for the EMU0404 USB audio device. The code is c++ available from https://github.com/Wouter1/EMU-driver
At some point (EMUUSBInputStream::readFrameList) I'm starting a isochronous asynchronous read from a USB pipe using
IOUSBPipe::Read(IOMemoryDescriptor, frameStart, numFra,es, IOUSBLowLatencyIsocFrame, IOUSBLowLatencyIsocCompletion, updateFrequency)
with frameStart set to kAppleUSBSSIsocContinuousFrame
On Yosemite this fails with error e00002ef
On Mavericks this works all as it should
Is this a new bug in Yosemite or is there something new that I missed?
Steps to Reproduce:
1. Do test on Yosemite. download the kext from my github site and follow install instructions. Attach your EMU0404 device
2. Check the system.log file. You will see this
27 Dec 2014 20:33:01 kernel[0]: +UsbInputRing::init 98304 529200
27 Dec 2014 20:33:01 kernel[0]: -UsbInputRing::init 185759637
27 Dec 2014 20:33:01 kernel[0]: USB pipe READ error e00002ef
Expected Results:
read success (no error message)
Actual Results:
USB pipe READ error e00002ef
Version:
OSX 10.9.5 works fine.
Yosemite latest version fails.
Notes:
I can't test this on my own machine that still has Mavericks. Report is based on detailed log files from a client who tries to run on Yosemite. More details are on https://github.com/Wouter1/EMU-driver/issues/17
Configuration:
Doing the same on Mavericks works fine
Attachments:
This is a follow-up to #18
Apple has changed something in the USB core to fix this issue.
They reported back
We may have to check if this change has consequences.