VCP problem Linux/Haswell

[mastykin]

Posted on May 21, 2014 at 09:28

Hello,

sorry for off-topic. Has somebody experienced problems with VCP in Linux with Z87/H87 chipsets? I have some fail-reports from clients and also tried it on colleagues computer.

After several working sessions with port, it won't open anymore. Somebody has this problem only with USB3, somebody only with USB2, I have this problem with both.

Inserting USB 2.0 HUB in between removes the problem.

Thank you!

#usb #vcp

[sdim]

Posted on May 21, 2014 at 12:03

Do the problem occure after USB S3 suspend and resume?

If yes, it is a known problem and it is fixed on the new Haswell revision (C2) .

https://qdms.intel.com/dm/d.aspx/C79FC2E6-6B75-4063-8687-660F4668FFC8/PCN112101-00.pdf

Description of Change to the Customer:

Intel is initiating a C1 to C2 stepping conversion for the Intel® 8 Series/C220 Series where products will undergo the following changes:

•  Metal layers change from C1 to C2 to fix USB SuperSpeed device remuneration erratum.

Google for ''Haswell usb bug''

[mastykin]

Posted on May 21, 2014 at 14:02

Thank you for the answer. I read about S3 suspend problem, but my problem happens during work with port.