I’ve been maintaining a PVR350 on an old Dell 2.4GHz since forever.
Latest updates (to MythTV 24.1, and licrd 0.9.0.7) have made big changes. But it’s all working again, including a serial IR blaster. The following is just for my easy reference, and anyone else who now finds their Grey Hauppauge remote [...]

Aim : Use 1 computer for two tasks : a) Desktop for GF to use as a regular linux machine (web browsing, photos, etc)b) Completely independent MythTV set-up, with the output going to the TV.
Also, the set-up has to be turn-key, with both sessions logging in automatically (goodbye
gdm
).
There’s a lot going on for this one. [...]

After upgrading to FC9, the previously working serial port channel-changer (bought from IRblaster.info) stopped working. None of the configuration had changed.
In addition to the serial port transmitter, there’s a receiver on the PVR350 card – handled by lirc_i2c
After much searching, an additional option came to light :
softcarrier=1
.
Here are the relevant parts of a confirmed [...]

Email me for the gory details (for FC7) – but see a more up-to-date post for the same thing (much cleaner) in Fedora 9.

The Situation
I have a Hauppauge PVR350 card, which includes an IR receiver (connected via a 2.5mm socket on the card), but I also need to control an external cable box via an IR blaster (bought from irblaster.info), and have COM1 free.
Actually, since I have a Belkin MediaPilot keyboard (mostly) working, I won’t need to use [...]

Upgrade to 2.6.22 seems to break *everything* in the ivtv suite. It all disappeared from the rpms, so we need to install from source.

ivtv
ivtv-fb
ivtv-xdriver
ivtvfbctl (now gone)

In particular, some web posts indicate that support for the PVR-350 has been eliminated somehow. This doesn’t seem to be completely true – but maybe there’s a problem [...]

Aim :

Enable a lightly used Linux machine to additionally host a MythTV video card.

Major Issues :

Upgrade to 2.6.22 breaks *everything* :

ivtv
ivtv-fb
ivtv-xdriver
ivtvfb-ctl (now gone)

Want to have two independent displays (two simultaneous X servers running)

Complex
/etc/X11/xorg.conf

Need to use
evdev
to have dual keyboards

Toy with
/etc/gdm/custom.conf
(not necessary, hardly working)

Added a Belkin wireless keyboard (from woot.com)

Set up special keys for MythTV

Control [...]