[Bug 655868] Re: FTDI based USB to serial adapter no longer works

[Vince McIntyre]

I have one of these devices too:
$ lsusb
Bus 005 Device 002: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 046d:c03d Logitech, Inc. M-BT96a Pilot Optical Mouse
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 004: ID 03f0:3611 Hewlett-Packard PSC 2410 PhotoSmart
Bus 002 Device 003: ID 413c:2003 Dell Computer Corp. Keyboard
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

but I don't see this precise problem.
$ dmesg |grep latency
[    0.540690] pci 0000:00:01.0: setting latency timer to 64
[    0.540704] pci 0000:00:1c.0: setting latency timer to 64
[    0.540723] pci 0000:00:1c.1: setting latency timer to 64
[    0.540730] pci 0000:00:1e.0: setting latency timer to 64
[    0.572644] pcieport 0000:00:01.0: setting latency timer to 64
[    0.572778] pcieport 0000:00:1c.0: setting latency timer to 64
[    0.572926] pcieport 0000:00:1c.1: setting latency timer to 64
[    0.642441] ata_piix 0000:00:1f.1: setting latency timer to 64
[    0.863461] ata_piix 0000:00:1f.2: setting latency timer to 64
[    0.868809] ehci_hcd 0000:00:1d.7: setting latency timer to 64
[    0.888362] uhci_hcd 0000:00:1d.0: setting latency timer to 64
[    0.888640] uhci_hcd 0000:00:1d.1: setting latency timer to 64
[    0.888915] uhci_hcd 0000:00:1d.2: setting latency timer to 64
[    0.889195] uhci_hcd 0000:00:1d.3: setting latency timer to 64
[    2.984776] tg3 0000:02:00.0: setting latency timer to 64
[   15.215316] nouveau 0000:01:00.0: setting latency timer to 64
[   18.011806] Intel ICH 0000:00:1e.2: setting latency timer to 64

This is with linux-image-2.6.32-25-generic version 2.6.32-25.44
$ uname -a
Linux ubuntu 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:26:08 UTC 2010 i686 GNU/Linux

I do have a problem with the device, however. It is not responding
properly when queried by /usr/bin/digitemp_DS9097U. Let me know if you
want me to file a separate bug, but for now here's the problem:

What I used to get was
$  digitemp_DS9097U -s /dev/ttyUSB0 -a -q
Sep 28 20:01:25 Sensor 0 C: 21.56 F: 70.81
Sep 28 20:01:26 Sensor 1 C: 23.06 F: 73.51
ie there are two one-wire temperature sensors plugged into the usb serial device.

Now what I get is:
$ digitemp_DS9097U -s /dev/ttyUSB0 -a -q 
Error 5: DS2480B Adapter Not Detected
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed
Error 10: Read COM Failed

This works ok on:
Linux ubuntu 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686 GNU/Linux

It also worked ok on:
Linux ubuntu 2.6.32-24-generic #43-Ubuntu SMP Thu Sep 16 14:17:33 UTC 2010 i686 GNU/Linux

It does not work on either of these mainline builds:
 2.6.32-0206322109-generic
 2.6.36-999.201009261124
The same error seems to be occurring.

Shortly I'll attach two straces - one where the digitemp program works
(2.6.32-22-generic) and another where it does not (2.6.24-25-generic).

-- 
FTDI based USB to serial adapter no longer works
https://bugs.launchpad.net/bugs/655868
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