[Bug 177166] Re: USB UIRT: uirt2_raw: checksum error

[MTO]

Hey! I eventually realized that the error message is sometimes a red
herring!

Apparently, what happens is that there are 2 protocols used by different
revs of the USBUIRT. The driver tries to use the v1 protocol to interpret a
packet, fails, logs an error, then succeeds with v2 and proceeds. So without
doing any changes to the kernel, I eventually got lirc receiving stuff.
Haven't had a chance to configure a .lirc to use it though...

On Fri, Apr 3, 2009 at 12:08 PM, randomubuntuguy
<john4lists at gmail.com>wrote:

> still exists in mythbuntu 8.10
>  2.6.27-9-generic #1 SMP Thu Nov 20 21:57:00 UTC 2008 i686 GNU/Linux
>
> I don't want to recompile modules from source to fix this.
>
> Why not fix it? I already spent the $58 and I'm sure a bunch of others did
> too.  I'll hound the maker to participate more in linux bugtesting.
>
> ______________________________________________________________________________________
> >From the mythtv wiki:
>
>  Partial Fix
>
> A number of distributions are using a patched FTDI driver that solves
> the kernel oops, but is missing a critical fix to allow the USB-UIRT to
> work.
>
> In /usr/src/linux/drivers/usb/serial/ftdi_sio.c locate the function
> ftdi_tiocmget and add "case FT232RL:" just after "case FT223C:". Then
> rebuild and install your modules.
>
> Without this fix you will get an error from lircd about not being able
> to set DTR.
>
> --
> USB UIRT: uirt2_raw: checksum error
> https://bugs.launchpad.net/bugs/177166
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux-meta” source package in Ubuntu: Fix Released
>
> Bug description:
> Binary package hint: linux-image
>
> There was a regression in between 2.6.22 and 2.6.20 that made the USB UIRT
> stop working.
>
> The USB UIRT is an infrared transceiver.  You plug it into your computer,
> and it receives signals from your remote control.  This is an important
> device because it's not only the cheapest piece of hardware that does this
> ($8), but it's also the only cheap one that connects via USB and not via
> your serial port.  So, it's a very important piece of hardware for HTPC
> software like MythTV.
>
> Here is the error messages reported in /var/log/messages:
>
> Sep 28 21:33:33 cesspool lircd-0.8.2[3729]: accepted new client on
> /dev/lircd
> Sep 28 21:33:33 cesspool lircd-0.8.2[3729]: uirt2_raw: checksum error
> Sep 28 21:33:34 cesspool lircd-0.8.2[3729]: uirt2_raw: UIRT version 0905 ok
> Sep 28 21:33:34 cesspool lircd-0.8.2[3729]: uirt2_raw: could not set DTR
> Sep 28 21:33:34 cesspool lircd-0.8.2[3729]: caught signal
>
> People are working around this issue by copying ftdi_sio.c and ftdi_sio.h
> from a 2.6.20 kernel source code tree into the 2.6.22 sources:
>
> http://ubuntuforums.org/showthread.php?t=579024
>
> It's definitely an upstread issue.  Here, they're talking about the issue
> on the mythtv-users mailing list and distributions other than Ubuntu:
>
> http://www.gossamer-threads.com/lists/mythtv/users/293503
>

-- 
USB UIRT: uirt2_raw: checksum error
https://bugs.launchpad.net/bugs/177166
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