Thanks in advance for your help,

I have been trying to find solutions for this all week (that actually work) via google and our beloved LQ forum. I have a crystal fontz lcd 20x4 connected via usb to pl2303 serial converter. I also have the screen powered up properly with backlighting working. the below readout from dmesg detects the item in question. I also have the LCDproc working and displaying in command line mode. My problem is that I cannot get anything to make its way to the actual display.

root@p4:~# dmesg | grep usb
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb.c: new USB bus registered, assigned bus number 1
usb.c: new USB bus registered, assigned bus number 2
usb.c: USB device 2 (vend/prod 0x46d/0xc00e) is not claimed by any active driver.
usb.c: USB device 2 (vend/prod 0x3f0/0x207) is not claimed by any active driver.
usb.c: registered new driver usbmouse
input0: Logitech USB-PS/2 Optical Mouse on usb1:2.0
usbmouse.c: v1.6:USB HID Boot Protocol mouse driver
usb.c: registered new driver hiddev
usb.c: registered new driver hid
usb.c: registered new driver usb-storage
usb.c: USB device 3 (vend/prod 0x557/0x2008) is not claimed by any active driver.
usb.c: registered new driver serial
usbserial.c: USB Serial support registered for Generic
usbserial.c: USB Serial Driver core v1.4
usbserial.c: USB Serial support registered for PL-2303
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
usb.c: USB disconnect on device 00:1f.2-1 address 3
usbserial.c: PL-2303 converter now disconnected from ttyUSB0
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
usb.c: USB disconnect on device 00:1f.2-1 address 4
usbserial.c: PL-2303 converter now disconnected from ttyUSB0
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
usb.c: USB disconnect on device 00:1f.2-1 address 5
usbserial.c: PL-2303 converter now disconnected from ttyUSB0
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
usb.c: USB disconnect on device 00:1f.2-1 address 6
usbserial.c: PL-2303 converter now disconnected from ttyUSB0
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)

on a side note /var/log/messages has:

Nov 20 17:00:16 p4 kernel: hub.c: new USB device 00:1f.2-1, assigned address 7
Nov 20 17:00:16 p4 kernel: usbserial.c: PL-2303 converter detected
Nov 20 17:00:16 p4 kernel: usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)


help!

I'm having troubles with my pl 2303 also.

In another message in these forums, one user had luck by loading a required acpi module. I had acpi turned off ... turning it on didn't help me, but you might check if any acpi modules appear in your mod list.

Hi,

that message means that your model is not compiled into the driver.
If you want to have that thing working you have to edit the driver header and add your model.
Other option is to try modprobe with the parameters.

Regards,

Thanks for your reply...

Yes after compiling a 2.6 kernel I saw the support in the build for LCD where as 2.4 seems to have no support.