| 1 |
Hello, |
| 2 |
|
| 3 |
i own a USB docking station which also contains a serial connector. |
| 4 |
|
| 5 |
The host will do USB 2.0 (kernel module ehci-hcd) and detects the PL2303 |
| 6 |
serial port properly. It loads the appropiate kernel module, but at the end |
| 7 |
it fails somehow with the following message: |
| 8 |
---------------- cut -------------------- |
| 9 |
pl2303 ttyUSB0: pl2303_open - failed submitting interrupt urb, error -28 |
| 10 |
---------------- cut -------------------- |
| 11 |
|
| 12 |
As result the device /dev/ttyUSB0 is allocated by udev, but not working. |
| 13 |
|
| 14 |
After some tests i got a work around. I have to unload the kernel module |
| 15 |
ehci-hcd. Due uhci-hcd remains loaded the device works in USB 1.1 mode. Here |
| 16 |
the serial port works properly. |
| 17 |
|
| 18 |
Is there a fix the keep me from unloading the kernel module every time i want |
| 19 |
to use the serial port ? |
| 20 |
For example by directing the system to always bind the serial port to uhci-hcd |
| 21 |
(USB 1.1). Or better by a fix for ehci-hcd/pl2303 kernel. |
| 22 |
|
| 23 |
My system is Gentoo 2007.0, i386 and x86_64. |
| 24 |
|
| 25 |
lsusb tells (limited to the docking station): |
| 26 |
---------------- cut -------------------- |
| 27 |
Bus 005 Device 009: ID 067b:0000 Prolific Technology, Inc. PL2301 USB-USB |
| 28 |
Bridge |
| 29 |
Bus 005 Device 006: ID 067b:2305 Prolific Technology, Inc. PL2305 Parallel |
| 30 |
Port |
| 31 |
Bus 005 Device 008: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port |
| 32 |
Bus 005 Device 007: ID 0d3d:0001 Tangtop Technology Co., Ltd |
| 33 |
Bus 005 Device 005: ID 05e3:0604 Genesys Logic, Inc. USB 1.1 Hub |
| 34 |
Bus 005 Device 004: ID 1631:6200 |
| 35 |
Bus 005 Device 003: ID 0409:0058 NEC Corp. HighSpeed Hub |
| 36 |
---------------- cut -------------------- |
| 37 |
|
| 38 |
regards |
| 39 |
Petric |
| 40 |
-- |
| 41 |
gentoo-user@g.o mailing list |
Archives