1 |
I've recently had to change my MB to a M2A-VM (AMD 690G/ATI SB600 |
2 |
chipset), since then I have problems with the USB2.0. |
3 |
|
4 |
The syslog most of the times shows at boot the ehci_hcd kernel driver |
5 |
(the 2.0 driver) trying to assign some address to the 2.0 hub, and the |
6 |
hub refusing it or failing with some I/O error. The driver tries 4 |
7 |
different addresses, then falls back to ohci_hcd (the 1.1 driver) and |
8 |
works fine but at low speed. The whole procedure takes maybe 1 minute, |
9 |
for this time any peripheral connected to the port will not be detected. |
10 |
|
11 |
Google suggested hw problems (e.g. cables), so I installed Windows and |
12 |
did some test, looks like it is working fine at high speed (I used an |
13 |
utility similar to usbview to check the driver tree). I'll do some more |
14 |
testing to exclude the hw problem. |
15 |
|
16 |
Note that since 2.6.26 the kernel displays the "unable to enumerate USB |
17 |
device on port x" at every boot, but according to Google it is |
18 |
relatively common and does not harm functionality, so I believe my |
19 |
problem is something else. |
20 |
|
21 |
If anybody has some suggestion I'll appreciate. |
22 |
|
23 |
raf |