Re: video from USB DVB-T get damaged after some time (it9135)

[Antti Palosaari <crope@iki.fi>]

Moikka!

On 21.02.2014 15:06, kapetr@mizera.cz wrote:
> Hello,
>
> == Antti:
>
> May I ask, if you have the same one stick?
> Does it work without problems ?

I don't have just similar stick, but I tested 1-2 sticks having that 
same chipset. No problems at all.

>
> == everybody:
>
> I have final tested it under W-XP SP2 with orig drivers and SW.
> It goes into problems after some time too, BUT there is a difference: It
> is able to "recover" from it itself and it plays again (for some time).
>
> As I wrote - it happens quicker and more frequently on TV channels with
> lower/worse signal. That is why I thing that tuner will lose "tuned"
> status to exact freq.
> Would be not possible to solve this (to re-tune) in driver ? It seems,
> that in W-XP is something like that in drivers.


I am pretty sure problem is RF-tuner. It warms and goes off from 
frequency a little, which causes signal level drop. As signal goes 
weaken, from a point of demodulator, it starts getting decoding errors.

Retune fixes things for a while as tuner is calibrated each time when 
tuning is done. If you wait a little longer, demod will lose signal LOCK 
and retune is issued - as what happens on windows driver too.

It is possible to add some early re-tune logic to demod driver, but it 
does not sound very wise for single problematic device. Also better 
approach could be to issue tuner calibration on 5 minute intervals or 
so. I am not sure if calibrating tuner is possible at runtime, but it 
should be easy to test.

Anyhow, I am not going to waste any time for workaround this strange 
issue. You are simply only one having it :) Just get new similar stick 
and hope it works better.


regards
Antti



>
>
> Regards
>
> --kapetr
>
>
> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Hello,
>
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>
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>
> --kapetr
>
>
> Dne 10.2.2014 09:34, Antti Palosaari napsal(a):
>> Moi!
>>
>> On 10.02.2014 10:21, kapetr@mizera.cz wrote:
>>> Hello,
>>>
>>> I have test FW version 12.10.04.1
>>> (FYI dmesg changes follows)
>>>
>>> The problem without change.
>>>
>>> I did want to test the DVB-T stick under Windows XP, but in VirtualBox
>>> works the tuner not at all - I get just jerky sound, no video.
>>> But there is older driver (12.7.6.11) - but don't thing the problem is
>>> there - rather in VBOX.
>>> And no free partition to test.
>>
>>
>> OK, thank for the testing anyway.
>> I have few different it9135 devices. Could you find some picture of
>> yours, I would like to test myself if I had same device.
>>
>> regards
>> Antti
>>
>>
>>
>>
>>>
>>> Regards.
>>>
>>> kapetr
>>>
>>>
>>> ----------- old from
>>> https://raw.github.com/torvalds/linux/master/Documentation/dvb/get_dvb_firmware
>>>
>>>
>>>
>>>
>>>
>>> [   21.546241] usb 1-1.3: dvb_usb_af9035: prechip_version=83
>>> chip_version=02 chip_type=9135
>>> [   21.546613] usb 1-1.3: dvb_usb_v2: found a 'ITE 9135 Generic' in cold
>>> state
>>> [   21.563582] usb 1-1.3: dvb_usb_v2: downloading firmware from file
>>> 'dvb-usb-it9135-02.fw'
>>> [   21.594974] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
>>> [   21.659449] usb 1-1.3: dvb_usb_af9035: firmware version=3.39.1.0
>>> [   21.659456] usb 1-1.3: dvb_usb_v2: found a 'ITE 9135 Generic' in warm
>>> state
>>> [   21.660358] usb 1-1.3: dvb_usb_v2: will pass the complete MPEG2
>>> transport stream to the software demuxer
>>> [   21.660375] DVB: registering new adapter (ITE 9135 Generic)
>>> [   21.750565] i2c i2c-16: af9033: firmware version: LINK=0.0.0.0
>>> OFDM=3.9.1.0
>>> [   21.750570] usb 1-1.3: DVB: registering adapter 0 frontend 0 (Afatech
>>> AF9033 (DVB-T))...
>>> [   22.064646] i2c i2c-16: tuner_it913x: ITE Tech IT913X successfully
>>> attached
>>> [   22.099994] Registered IR keymap rc-it913x-v1
>>> [   22.100068] input: ITE 9135 Generic as
>>> /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/rc/rc0/input14
>>> [   22.100103] rc0: ITE 9135 Generic as
>>> /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/rc/rc0
>>> [   22.100106] usb 1-1.3: dvb_usb_v2: schedule remote query interval to
>>> 500 msecs
>>> [   22.100109] usb 1-1.3: dvb_usb_v2: 'ITE 9135 Generic' successfully
>>> initialized and connected
>>> [   22.100123] usbcore: registered new interface driver dvb_usb_af9035
>>>
>>> ---------------new from
>>> http://palosaari.fi/linux/v4l-dvb/firmware/IT9135/12.10.04.1/IT9135v2_3.42.3.3_3.29.3.3/
>>>
>>>
>>>
>>>
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.520617] usb 1-1.3:
>>> dvb_usb_af9035: prechip_version=83 chip_version=02 chip_type=9135
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.520988] usb 1-1.3: dvb_usb_v2:
>>> found a 'ITE 9135 Generic' in cold state
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.522267] usb 1-1.3: dvb_usb_v2:
>>> downloading firmware from file 'dvb-usb-it9135-02.fw'
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.626497] usb 1-1.3:
>>> dvb_usb_af9035: firmware version=3.42.3.3
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.626509] usb 1-1.3: dvb_usb_v2:
>>> found a 'ITE 9135 Generic' in warm state
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.627381] usb 1-1.3: dvb_usb_v2:
>>> will pass the complete MPEG2 transport stream to the software demuxer
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.627405] DVB: registering new
>>> adapter (ITE 9135 Generic)
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631208] i2c i2c-16: af9033:
>>> firmware version: LINK=0.0.0.0 OFDM=3.29.3.3
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631215] usb 1-1.3: DVB:
>>> registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631328] i2c i2c-16:
>>> tuner_it913x: ITE Tech IT913X successfully attached
>>> --------------
>>>
>>>
>>>
>>>
>>> Dne 9.2.2014 05:57, Antti Palosaari napsal(a):
>>>> On 09.02.2014 02:42, Antti Palosaari wrote:
>>>>> Moikka!
>>>>> I am going to extract new firmware. I dumped init tables out from
>>>>> Windows driver version 12.07.06.1. Is there any newer?
>>>>>
>>>>> regards
>>>>> Antti
>>>>>
>>>>
>>>> I extracted firmwares from Windows driver 12.10.04.1. Didn't find newer
>>>> driver...
>>>>
>>>> http://blog.palosaari.fi/2014/02/linux-it9135-driver-firmwares.html
>>>>
>>>> regards
>>>> Antti
>>>>
>>
>>


-- 
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