Hello,

I am having the exact same problem described here (with no resolution):

http://www.mail-archive.com/[email protected]/msg06165.html

Brand new LinkUSB with custom-built 2.6.35.3 on Ubuntu 10.04.

An strace shows select() timing out:

open("/dev/ttyUSB1", O_RDWR|O_NOCTTY|O_NONBLOCK|O_LARGEFILE) = 3
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_CONTINUE or TCSETSF, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_CONTINUE or TCSETSF, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, TCFLSH, 0x2)                   = 0
ioctl(3, TCSBRK, 0)                     = 0
select(4, [3], NULL, NULL, {0, 1000})   = 0 (Timeout)
nanosleep({0, 100000000}, 0xbfe24350)   = 0
select(4, NULL, [3], NULL, {5, 0})      = 1 (out [3], left {4, 999993})
gettimeofday({1282605720, 350203}, NULL) = 0
gettimeofday({1282605720, 350246}, NULL) = 0
write(3, " ", 1)                        = 1
ioctl(3, TCSBRK, 0x1)                   = 0
gettimeofday({1282605720, 350873}, NULL) = 0
select(4, [3], NULL, NULL, {5, 0})      = 0 (Timeout) <----- OUCH!
write(2, "CONNECT: ow_com_read.c:COM_read("..., 82CONNECT: 
ow_com_read.c:COM_read(72) Timeout error (read) serial port: 
/dev/ttyUSB1) = 82
write(2, "\n", 1
)                       = 1
ioctl(3, TCFLSH, 0x2)                   = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
ioctl(3, SNDCTL_TMR_START or TCSETS, {B9600 -opost -isig -icanon -echo 
...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon 
-echo ...}) = 0
close(3)                                = 0

I can access the LinkUSB with no problems using minicom.

This seems to be a driver/kernel problem, but any suggestions on how to 
troubleshoot this; has anyone had any problems with the FTDI USB Serial 
Device converter driver need to communicate with the LinkUSB?

Thanks in advance,

Eloy Paris.-

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