- Some USB ports are disabled and as a result, USB 2.0 devices attached to these ports appear with a Yellow Exclamation in device manager.
Flash devices known to cause this condition with AMD systems but could also affect other systems are:
- Toshiba Model # U2M-016GT
- Kingston Model DT 4G
USB 2.0 non-compliant devices connected to a EHCI Host port can generate what is termed as a "babble condition" (where the device continues to talk outside of its frame). As a result, the host controller detects the Babble condition and disables the offending port. However, if the Babble condition happens at the end of the Frame, due to a Host Controller logic issue on some AMD systems, the Host Controller also disables all other downstream ports within this controller.
Example: In AMD Hudson 1 based systems there are 5 (five) ports per EHCI controller. If a Babble condition is detected on port 3, then all five ports, port 0 to 4, are disabled by the Host controller.
Raksta ID: 2521680. Pēdējo reizi pārskatīts: 2011. gada 23. marts. Pārskatījums: 1