I do not know if this is the problem but: As per V4L2 specifications VIDIOC_S_FREQUENCY ioctl expects tuning frequency in units of 62.5 KHz, or if the struct v4l2_tuner or struct v4l2_modulator capabilities flag V4L2_TUNER_CAP_LOW is set, in units of 62.5 Hz. But FM driver presently handling the frequency in units of 1 KHz FM driver is not setting V4L2_TUNER_CAP_LOW flag , but its returning vtun.rangelow and vtun.rangehigh ranges in HZ . This needs to be corrected in FM driver. On Tue, Mar 27, 2018 at 1:52 PM, P G <zradu1100@xxxxxxxxx> wrote: > I have tuner card, with radio tuner. > > The modules are loaded fine, no errors in dmesg, but radio is having issues. > I use radio application from xawtv, and also fm tools, but none of > them is working properly. > When i fire up radio, it tunes to 1.04MHZ, and i hear sound noise > (like when radio isn't tuned). If i tune to another frequency, let's > say 88.0Mhz, i hear the radio station sound for 1-2 seconds, and then > the tuner tunes back to 1.04Mhz. > Same applies for fm tools. I tune with command fm 88.0 on, tuner tunes > in the apropriate radio station for a few seconds and then it goes > back to noise. > > You can see it here as well: > Code: > > v4l2-ctl -d /dev/radio0 --all > > Driver Info (not using libv4l2): > Driver name : saa7134 > Card type : ASUSTeK P7131 Hybrid > Bus info : PCI:0000:04:01.0 > Driver version: 3.13.2 > Capabilities : 0x85050015 > Video Capture > Video Overlay > VBI Capture > Tuner > Radio > Read/Write > Streaming > Device Capabilities > Device Caps : 0x00050000 > Tuner > Radio > Priority: 2 > Frequency for tuner 0: 16640 (1.040000 MHz) > Tuner 0: > Name : Radio > Capabilities : 62.5 Hz stereo freq-bands > Frequency range : 65.000 MHz - 108.000 MHz > Signal strength/AFC : 0%/0 > Current audio mode : stereo > Available subchannels: mono > mute (bool) : default=0 value=0 > > The frequency of the tuner is 1.040000 MHz, but the range of the tuner > is between 65 and 108 as it should be. > Does anyone has any idea if is FM driver bug?
