Am 17.01.2015 um 16:35 schrieb Istvan Gabor:

Aaron Digulla írta:

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Am Mittwoch, 14. Januar 2015 13:51 CET, Istvan Gabor schrieb:

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Hello:

Does anyone know of a fix for this nasty bug which makes some USB3 devices unusable? When a USB3 device is plugged in, dmesg reports:

rounding interval to 128 microframes, ep desc says 255 microframes

Apparently this is a quite old USB driver bug that affects every linux systems, in my case it is openSUSE 13.2 i686 (3.16.6-2-desktop #1 SMP PREEMPT Mon Oct 20 13:47:22 UTC 2014 (feb42ea) i686 i686 i386 GNU/Linux). I couldn't find by google querying though if there is a fix for it.

I'm plagued by the same problem: https://bugzilla.novell.com/show_bug.cgi?id=856794

Others have same problem: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1102797

Thanks, Aaron.

I've read that bugzilla entry, and your related posts as well. I find strange that there isn't any fix for this bug, or even any progress in fixing it. According to google search many users are hit by this. Please post if you find a fix or workaround.

I've also read that plugging the USB device into a USB2 port might help. But in my case even if I use a USB2 port, the same xhci driver handles the device.

I have another question: might it be that the problem is not caused by this bug but related to this issue:

Intel Confirms Haswell Chipset Bug

http://www.vrworld.com/2013/04/05/intel-confirms-haswell-chipset-bug/

"One of the unofficial claims was that there was a serious bug with the accompanying Lynx Point ?8 series / C220? chipset that causes USB devices to disappear after the computer transitioned into standby mode (specifically S3)."

I have a mobo with this chipset but I don't know its stepping version.

Or are these two unrelated? Do I have to face with two USB3 bugs in this case?

I also have a Haswell board. My current feeling is that this is related to USB 3, Haswell chipset and certain devices. It's not related to power saving - my keyboard and my mouse work, I can use USB drives and download images from my mobile phone. It feels like a bug in xhci since the same scanner worked once with openSUSE but a different mainboard (which didn't support USB3). Regards, -- Aaron "Optimizer" Digulla a.k.a. Philmann Dark "It's not the universe that's limited, it's our imagination. Follow me and I'll show you something beyond the limits." http://blog.pdark.de/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org