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[Jarod Wilson <jarod@xxxxxxxxxxxx>]

I've patched a 5ms exit delay into the send_packet() function in
lirc_imon in current lirc cvs (and in the merged-upstream-in-2.6.35 imon
driver). The microsecond delays were a bit on the low side. This 5ms
delay doesn't show any functional regressions on any of the three imon
devices I've got, and does indeed fix garbage displaying on my own
0x0044 (Antec Veris Elite) VFD -- a problem that only cropped up with
the latest motherboard in this system, its been just fine w/all other
motherboards (*only* the motherboard was changed in this system, all
other components are identical to a prior setup where the VFD behaved
just fine). lirc 0.8.7 should be released within a week or three, and
will carry this fix (as does the imon driver in 2.6.35+).

-- 
Timing problem (garbage characters) in lirc-driver for iMon PAD VFD 15c2:0036
https://bugs.launchpad.net/bugs/517956
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Status in “lirc” package in Ubuntu: New

Bug description:
Binary package hint: lirc

In the lirc-driver for the Soundgraph iMon PAD VFD, USB-ID 15c2:0036, there is a timing problem. Packets are sent too fast to the USB-Device. You can see that you are affected by this problem, if you find similar lines in your syslog:

[...]
Feb  6 08:06:09 mythtv kernel: [   47.727759] lirc_imon: vfd_write: send packet failed for packet #2
Feb  6 08:06:09 mythtv kernel: [   47.978904] lirc_imon: send_packet: packet tx failed (-32)
Feb  6 08:06:09 mythtv kernel: [   47.978909] lirc_imon: vfd_write: send packet failed for packet #4
Feb  6 08:06:09 mythtv kernel: [   48.223802] lirc_imon: send_packet: packet tx failed (-32)
Feb  6 08:06:09 mythtv kernel: [   48.223807] lirc_imon: vfd_write: send packet failed for packet #2
Feb  6 08:06:09 mythtv kernel: [   48.471698] lirc_imon: send_packet: packet tx failed (-32)
Feb  6 08:06:09 mythtv kernel: [   48.471703] lirc_imon: vfd_write: send packet failed for packet #1
[...]

To fix the problem, you can apply the enclosed patch and rebuild the dkms lirc modules:
cd /usr/src/lirc-0.8.6/
sudo dkms remove -m lirc -v 0.8.6 -k `uname -r`
sudo patch -p0 < lirc-0.8.6-VFD_0x0036_timing.patch
sudo dkms add -m lirc -v 0.8.6
sudo dkms build -m lirc -v 0.8.6
sudo dkms install --force -m lirc -v 0.8.6

The patch will add some 20 microseconds delay before each package send. It's not the most beautiful solution, but until there is some corrected upstream, this will help.

HTH, Edi

Guideline informations:
1) Ubuntu-Release:
Description:	Ubuntu 9.10
Release:	9.10

2) Package Version:
lirc-modules-source:
  Installed: 0.8.6-0ubuntu2
  Candidate: 0.8.6-0ubuntu2
  Version table:
 *** 0.8.6-0ubuntu2 0
        500 http://archive.ubuntu.com karmic/universe Packages
        100 /var/lib/dpkg/status

3) What should happen:
Correct information displayed on the VFD

4) What happens:
Garbage characters displayed on VFD

ProblemType: Bug
Architecture: amd64
Date: Sat Feb  6 09:07:02 2010
DistroRelease: Ubuntu 9.10
Package: lirc-modules-source 0.8.6-0ubuntu2 [modified: usr/src/lirc-0.8.6/drivers/lirc_imon/lirc_imon.c]
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=de_CH.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-19.56-generic
SourcePackage: lirc
Uname: Linux 2.6.31-19-generic x86_64