Bug 6461 - pl2303: Multiple device problem
Summary: pl2303: Multiple device problem
Alias: None
Product: Drivers
Classification: Unclassified
Component: USB (show other bugs)
Hardware: i386 Linux
: P2 normal
Assignee: Greg Kroah-Hartman
Depends on:
Blocks: USB
  Show dependency tree
Reported: 2006-04-30 00:19 UTC by Bill Hull
Modified: 2006-07-10 13:00 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.16
Tree: Mainline
Regression: ---


Description Bill Hull 2006-04-30 00:19:04 UTC
Most recent kernel where this bug did not occur: Unknown
Distribution: FC4
Problem Description:

 Using 2 serial adapters based on the pl2303 (HX, I beleive) chipset.  First
device works fine, second is detected but non-functional (no TX/RX from a
modem). I've tried switching the order they are attached (both adapters do work).

Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 001: ID 0000:0000

drivers/usb/serial/usb-serial.c: USB Serial Driver core
drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
pl2303 1-2:1.0: pl2303 converter detected
usb 1-2: pl2303 converter now attached to ttyUSB0
pl2303 2-1:1.0: pl2303 converter detected
usb 2-1: pl2303 converter now attached to ttyUSB1
usbcore: registered new driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver

Steps to reproduce:

 Attached two pl2303 devices, attempt to use second device.
Comment 1 Greg Kroah-Hartman 2006-06-06 01:10:49 UTC
Can you load the driver with "modprobe pl2303 debug=1" to see if we can get
some good debugging messages when you try to access the second device?  I 
tested this a long time ago, and it should work...

Just attach the kernel log output for when you do this please.
Comment 2 Adrian Bunk 2006-07-10 13:00:16 UTC
Please reopen this bug if:
- it is still present in kernel 2.6.17 and
- you can provide the requested data.

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