[Bugme-janitors] [Bug 14551] New: FM Radio tuner of WinTV PCI (Conexant CX23881-19 chip) doesn't work

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=14551

           Summary: FM Radio tuner of WinTV PCI (Conexant CX23881-19 chip)
                    doesn't work
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26
                    UTC 2009 i686 GNU/Linux
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: drivers_other at kernel-bugs.osdl.org
        ReportedBy: jens.kager at inode.at
        Regression: No


The card (WinTV PCI, model 34519 Rev J189, using the Conexant CX23881-19
decoder chip) supports analog TV and FM radio, both of which I confirmed to be
working in a Windows XP machine. TV also works on linux (Ubuntu 9.10, kernel
version 2.6.31-14-generic), but the FM radio tuner doesn't work properly.

The device file /dev/radio0 is there, but every radio application I tried
produces only a hissing noise on every frequency and doesn't find any channels.
When I start "radio -c /dev/radio0" (from the "radio" package), the tuner
frequency shown initially is "2147.", whatever this is supposed to mean. In
this setting, it is noticable that there is some radio signal there - it is
very faint and unintelligible, but you can tell that there are people speaking.

As soon as I try to change the frequency though, a hissing noise appears which
sounds exactly the same on each and every frequency. Also, on no frequency I
can set up there is anything resembling the unintelligible speech heard in the
tool's initial setting.

I suspect that the code to change the tuner frequency doesn't work correctly
for this card: When I load the module cx88xx with option "radio=51", "radio=60"
or "radio=78", I still hear the hissing noise in the initial setting of the
radio app (with frequency display on "2147."), but when I change the frequency
I get a working radio signal - rather clear and ok sounding - just that it's
the same signal no matter which frequency I choose!

When unloading the module and loading with another radio option (or none), the
previous behavior reappears (only noise on all frequencies).


The card's lspci output:

03:06.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI
Video and Audio Decoder (rev 05)
        Subsystem: Hauppauge computer works Inc. Device 3401
        Flags: bus master, medium devsel, latency 32, IRQ 19
        Memory at dd000000 (32-bit, non-prefetchable) [size=16M]
        Capabilities: [44] Vital Product Data <?>
        Capabilities: [4c] Power Management version 2
        Kernel driver in use: cx8800
        Kernel modules: cx8800

03:06.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video
and Audio Decoder [Audio Port] (rev 05)
        Subsystem: Hauppauge computer works Inc. Device 3401
        Flags: medium devsel, IRQ 19
        Memory at de000000 (32-bit, non-prefetchable) [size=16M]
        Capabilities: [4c] Power Management version 2
        Kernel modules: cx88-alsa

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