[linux-dvb] Unable to query frontend status with dvbscan

[linux-dvb] Unable to query frontend status with dvbscan

[Stefano Sabatini]

Hi all,

can you say what's the meaning of such a message?

I'm using it with:
dvbscan  /usr/share/dvb/dvb-t/it-MyCity
Unable to query frontend status

using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.

The module seems to be loaded correctly, indeed I get this in the
kernel log:

[ 1834.456051] dib0700: loaded with support for 7 different device-types
[ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
[ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
[ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
[ 1834.662979] dib0700: firmware started successfully.
[ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
[ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
[ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
[ 1835.499932] xc2028 1-0061: creating new instance
[ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
[ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
[ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
[ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
[ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700

The led on the device switched on when I performed the first scan.

Thanks for any help.

Regards.

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Re: [linux-dvb] Unable to query frontend status with dvbscan

[Stefano Sabatini]

On date Tuesday 2008-10-14 23:24:02 +0200, Stefano Sabatini wrote:
> Hi all,
> 
> can you say what's the meaning of such a message?
> 
> I'm using it with:
> dvbscan  /usr/share/dvb/dvb-t/it-MyCity
> Unable to query frontend status
> 
> using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.
> 
> The module seems to be loaded correctly, indeed I get this in the
> kernel log:
> 
> [ 1834.456051] dib0700: loaded with support for 7 different device-types
> [ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
> [ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
> [ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
> [ 1834.662979] dib0700: firmware started successfully.
> [ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
> [ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
> [ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
> [ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
> [ 1835.499932] xc2028 1-0061: creating new instance
> [ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
> [ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
> [ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
> [ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
> [ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700
> 
> The led on the device switched on when I performed the first scan.

Other meaningful info:
stefano@geppetto ~> dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
Unable to query frontend status
stefano@geppetto ~> sudo dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
Unable to query frontend status
stefano@geppetto ~> ls -l /dev/dvb/adapter0/
total 0
crw-rw---- 1 root video 212, 1 2008-09-23 00:04 audio0
crw-rw---- 1 root video 212, 6 2008-09-23 00:04 ca0
crw-rw---- 1 root video 212, 4 2008-09-23 00:04 demux0
crw-rw---- 1 root video 212, 5 2008-09-23 00:04 dvr0
crw-rw---- 1 root video 212, 3 2008-09-23 00:04 frontend0
crw-rw---- 1 root video 212, 7 2008-09-23 00:04 net0
crw-rw---- 1 root video 212, 8 2008-09-23 00:04 osd0
crw-rw---- 1 root video 212, 0 2008-09-23 00:04 video0

stefano@geppetto ~> uname -a
Linux geppetto 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux

The device is reported to be supported on the DVB wiki:
http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_USB_XE

Help or hints will be appreciated.

Regards.

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Re: [linux-dvb] Unable to query frontend status with dvbscan

[Mark Paulus]

[-- Attachment #1: Type: text/plain, Size: 3099 bytes --]



Stefano Sabatini wrote:
> On date Tuesday 2008-10-14 23:24:02 +0200, Stefano Sabatini wrote:
>> Hi all,
>>
>> can you say what's the meaning of such a message?
>>
>> I'm using it with:
>> dvbscan  /usr/share/dvb/dvb-t/it-MyCity
>> Unable to query frontend status
>>
>> using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.
>>
>> The module seems to be loaded correctly, indeed I get this in the
>> kernel log:
>>
>> [ 1834.456051] dib0700: loaded with support for 7 different device-types
>> [ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
>> [ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
>> [ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
>> [ 1834.662979] dib0700: firmware started successfully.
>> [ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
>> [ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
>> [ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
>> [ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
>> [ 1835.499932] xc2028 1-0061: creating new instance
>> [ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
>> [ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
>> [ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
>> [ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
>> [ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700
>>
>> The led on the device switched on when I performed the first scan.
> 
> Other meaningful info:
> stefano@geppetto ~> dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> Unable to query frontend status
> stefano@geppetto ~> sudo dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> Unable to query frontend status
> stefano@geppetto ~> ls -l /dev/dvb/adapter0/
> total 0
> crw-rw---- 1 root video 212, 1 2008-09-23 00:04 audio0
> crw-rw---- 1 root video 212, 6 2008-09-23 00:04 ca0
> crw-rw---- 1 root video 212, 4 2008-09-23 00:04 demux0
> crw-rw---- 1 root video 212, 5 2008-09-23 00:04 dvr0
> crw-rw---- 1 root video 212, 3 2008-09-23 00:04 frontend0
> crw-rw---- 1 root video 212, 7 2008-09-23 00:04 net0
> crw-rw---- 1 root video 212, 8 2008-09-23 00:04 osd0
> crw-rw---- 1 root video 212, 0 2008-09-23 00:04 video0
> 
> stefano@geppetto ~> uname -a
> Linux geppetto 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux
> 
> The device is reported to be supported on the DVB wiki:
> http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_USB_XE
> 
> Help or hints will be appreciated.
> 
> Regards.

I believe I have seen a message like this when something else
is talking to the card already.  For instance, I run 
my cards in a Mythtv system, and in mythtv there is a setting 
to only attach to the card when actually using the card.  If that
setting is set incorrectly, mythtv will attach to the card 
at startup, and keep exclusive use of the card, not allowing
anyone else to access the card at all.


 

[-- Attachment #2: mark_paulus.vcf --]
[-- Type: text/x-vcard, Size: 309 bytes --]

begin:vcard
fn:Mark Paulus
n:Paulus;Mark
org:MCI;Lec Interfaces / 40419
adr;dom:;;2424 Garden of the Gods Rd;Colorado Springs;CO;80919
email;internet:mark.paulus@verizonbusiness.com
title:Mark Paulus
tel;work:719-535-5578
tel;pager:800-pagemci / 1406052
tel;home:v622-5578
version:2.1
end:vcard


[-- Attachment #3: Type: text/plain, Size: 150 bytes --]

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Re: [linux-dvb] Unable to query frontend status with dvbscan

[Stefano Sabatini]

On date Thursday 2008-10-16 07:19:18 -0600, Mark Paulus wrote:
> Stefano Sabatini wrote:
>> On date Tuesday 2008-10-14 23:24:02 +0200, Stefano Sabatini wrote:
>>> Hi all,
>>>
>>> can you say what's the meaning of such a message?
>>>
>>> I'm using it with:
>>> dvbscan  /usr/share/dvb/dvb-t/it-MyCity
>>> Unable to query frontend status
>>>
>>> using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.
>>>
>>> The module seems to be loaded correctly, indeed I get this in the
>>> kernel log:
>>>
>>> [ 1834.456051] dib0700: loaded with support for 7 different device-types
>>> [ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
>>> [ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
>>> [ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
>>> [ 1834.662979] dib0700: firmware started successfully.
>>> [ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
>>> [ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
>>> [ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
>>> [ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
>>> [ 1835.499932] xc2028 1-0061: creating new instance
>>> [ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
>>> [ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
>>> [ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
>>> [ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
>>> [ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700
>>>
>>> The led on the device switched on when I performed the first scan.
>>
>> Other meaningful info:
>> stefano@geppetto ~> dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
>> Unable to query frontend status
>> stefano@geppetto ~> sudo dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
>> Unable to query frontend status
>> stefano@geppetto ~> ls -l /dev/dvb/adapter0/
>> total 0
>> crw-rw---- 1 root video 212, 1 2008-09-23 00:04 audio0
>> crw-rw---- 1 root video 212, 6 2008-09-23 00:04 ca0
>> crw-rw---- 1 root video 212, 4 2008-09-23 00:04 demux0
>> crw-rw---- 1 root video 212, 5 2008-09-23 00:04 dvr0
>> crw-rw---- 1 root video 212, 3 2008-09-23 00:04 frontend0
>> crw-rw---- 1 root video 212, 7 2008-09-23 00:04 net0
>> crw-rw---- 1 root video 212, 8 2008-09-23 00:04 osd0
>> crw-rw---- 1 root video 212, 0 2008-09-23 00:04 video0
>>
>> stefano@geppetto ~> uname -a
>> Linux geppetto 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux
>>
>> The device is reported to be supported on the DVB wiki:
>> http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_USB_XE
>>
>> Help or hints will be appreciated.
>>
>> Regards.
>
> I believe I have seen a message like this when something else
> is talking to the card already.  For instance, I run my cards in a Mythtv 
> system, and in mythtv there is a setting to only attach to the card when 
> actually using the card.  If that
> setting is set incorrectly, mythtv will attach to the card at startup, 
> and keep exclusive use of the card, not allowing
> anyone else to access the card at all.

lsof didn't show any device accessing to device inside /dev/dvb.

But digging again in the web I found this:
http://forums.opensuse.org/archives/sf-archives/archives-software/archives-multimedia/340016-dvb-t-card-cant-scan-10-3-a.html

So the problem seems a regression in the dvb-apps.

And precisely the problem seems to be in the function:
libdvb/dvbfe.c:dvbfe_get_info()

Debugging I get this in dvbfe_get_info (second invocation during the
running of the application):

dvbfe_get_info (fehandle=0x8beb008, 
               querymask=DVBFE_INFO_LOCKSTATUS,
               result=0xbfada108, 
               querytype=DVBFE_INFO_QUERYTYPE_IMMEDIATE,
               timeout=0) at dvbfe.c:23

		if (querymask & DVBFE_INFO_LOCKSTATUS) {
			if (!ioctl(fehandle->fd, FE_READ_STATUS, &kevent.status)) {
				returnval |= DVBFE_INFO_LOCKSTATUS;
			}
		}

The result of the ioctl is 0 so the returnval is ored with
DVBFE_INFO_LOCKSTATUS (so set to 1), then we have in the main:

				if (dvbfe_get_info(fe, DVBFE_INFO_LOCKSTATUS, &feinfo,
				    			DVBFE_INFO_QUERYTYPE_IMMEDIATE, 0) !=
					DVBFE_INFO_QUERYTYPE_IMMEDIATE) {
					fprintf(stderr, "Unable to query frontend status\n");
					exit(1);
				}



which is different from DVBFE_INFO_QUERYTYPE_IMMEDIATE = 0, so the
exit, but I can really understand the logic here.

So what's the expected exit of the ioctl with FE_READ_STATUS?

Regards.

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Re: [linux-dvb] Unable to query frontend status with dvbscan

[Stefano Sabatini]

On date Thursday 2008-10-16 22:54:54 +0200, Stefano Sabatini wrote:
> On date Thursday 2008-10-16 07:19:18 -0600, Mark Paulus wrote:
> > Stefano Sabatini wrote:
> >> On date Tuesday 2008-10-14 23:24:02 +0200, Stefano Sabatini wrote:
> >>> Hi all,
> >>>
> >>> can you say what's the meaning of such a message?
> >>>
> >>> I'm using it with:
> >>> dvbscan  /usr/share/dvb/dvb-t/it-MyCity
> >>> Unable to query frontend status
> >>>
> >>> using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.
> >>>
> >>> The module seems to be loaded correctly, indeed I get this in the
> >>> kernel log:
> >>>
> >>> [ 1834.456051] dib0700: loaded with support for 7 different device-types
> >>> [ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
> >>> [ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
> >>> [ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
> >>> [ 1834.662979] dib0700: firmware started successfully.
> >>> [ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
> >>> [ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
> >>> [ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
> >>> [ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
> >>> [ 1835.499932] xc2028 1-0061: creating new instance
> >>> [ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
> >>> [ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
> >>> [ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
> >>> [ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
> >>> [ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700
> >>>
> >>> The led on the device switched on when I performed the first scan.
> >>
> >> Other meaningful info:
> >> stefano@geppetto ~> dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> >> Unable to query frontend status
> >> stefano@geppetto ~> sudo dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> >> Unable to query frontend status
> >> stefano@geppetto ~> ls -l /dev/dvb/adapter0/
> >> total 0
> >> crw-rw---- 1 root video 212, 1 2008-09-23 00:04 audio0
> >> crw-rw---- 1 root video 212, 6 2008-09-23 00:04 ca0
> >> crw-rw---- 1 root video 212, 4 2008-09-23 00:04 demux0
> >> crw-rw---- 1 root video 212, 5 2008-09-23 00:04 dvr0
> >> crw-rw---- 1 root video 212, 3 2008-09-23 00:04 frontend0
> >> crw-rw---- 1 root video 212, 7 2008-09-23 00:04 net0
> >> crw-rw---- 1 root video 212, 8 2008-09-23 00:04 osd0
> >> crw-rw---- 1 root video 212, 0 2008-09-23 00:04 video0
> >>
> >> stefano@geppetto ~> uname -a
> >> Linux geppetto 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux
> >>
> >> The device is reported to be supported on the DVB wiki:
> >> http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_USB_XE
> >>
> >> Help or hints will be appreciated.
> >>
> >> Regards.
> >
> > I believe I have seen a message like this when something else
> > is talking to the card already.  For instance, I run my cards in a Mythtv 
> > system, and in mythtv there is a setting to only attach to the card when 
> > actually using the card.  If that
> > setting is set incorrectly, mythtv will attach to the card at startup, 
> > and keep exclusive use of the card, not allowing
> > anyone else to access the card at all.
> 
> lsof didn't show any device accessing to device inside /dev/dvb.
> 
> But digging again in the web I found this:
> http://forums.opensuse.org/archives/sf-archives/archives-software/archives-multimedia/340016-dvb-t-card-cant-scan-10-3-a.html
> 
> So the problem seems a regression in the dvb-apps.
> 
> And precisely the problem seems to be in the function:
> libdvb/dvbfe.c:dvbfe_get_info()
> 
> Debugging I get this in dvbfe_get_info (second invocation during the
> running of the application):
> 
> dvbfe_get_info (fehandle=0x8beb008, 
>                querymask=DVBFE_INFO_LOCKSTATUS,
>                result=0xbfada108, 
>                querytype=DVBFE_INFO_QUERYTYPE_IMMEDIATE,
>                timeout=0) at dvbfe.c:23
> 
> 		if (querymask & DVBFE_INFO_LOCKSTATUS) {
> 			if (!ioctl(fehandle->fd, FE_READ_STATUS, &kevent.status)) {
> 				returnval |= DVBFE_INFO_LOCKSTATUS;
> 			}
> 		}
> 
> The result of the ioctl is 0 so the returnval is ored with
> DVBFE_INFO_LOCKSTATUS (so set to 1), then we have in the main:
> 
> 				if (dvbfe_get_info(fe, DVBFE_INFO_LOCKSTATUS, &feinfo,
> 				    			DVBFE_INFO_QUERYTYPE_IMMEDIATE, 0) !=
> 					DVBFE_INFO_QUERYTYPE_IMMEDIATE) {
> 					fprintf(stderr, "Unable to query frontend status\n");
> 					exit(1);
> 				}
> 
> 
> 
> which is different from DVBFE_INFO_QUERYTYPE_IMMEDIATE = 0, so the
> exit, but I can really understand the logic here.
> 
> So what's the expected exit of the ioctl with FE_READ_STATUS?

I read the log, and I see that apparently no changes has been
performed in the last two years on the affected code, so I tend to
believe that this isn't a regression in the utility but rather some
problem in the module/kernel.

So a pointer to the documentation of that ioctl would be nice,
meaninwhile I'll check for the w_scan application.

Thanks in advance, regards.

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Re: [linux-dvb] Unable to query frontend status with dvbscan

[Stefano Sabatini]

On date Saturday 2008-10-18 13:26:24 +0200, Stefano Sabatini wrote:
> On date Thursday 2008-10-16 22:54:54 +0200, Stefano Sabatini wrote:
> > On date Thursday 2008-10-16 07:19:18 -0600, Mark Paulus wrote:
> > > Stefano Sabatini wrote:
> > >> On date Tuesday 2008-10-14 23:24:02 +0200, Stefano Sabatini wrote:
> > >>> Hi all,
> > >>>
> > >>> can you say what's the meaning of such a message?
> > >>>
> > >>> I'm using it with:
> > >>> dvbscan  /usr/share/dvb/dvb-t/it-MyCity
> > >>> Unable to query frontend status
> > >>>
> > >>> using a TerraTec Electronic GmbH with dvb-usb-dib0700 driver.
> > >>>
> > >>> The module seems to be loaded correctly, indeed I get this in the
> > >>> kernel log:
> > >>>
> > >>> [ 1834.456051] dib0700: loaded with support for 7 different device-types
> > >>> [ 1834.456051] dvb-usb: found a 'Terratec Cinergy HT USB XE' in cold state, will try to load a firmware
> > >>> [ 1834.456051] firmware: requesting dvb-usb-dib0700-1.10.fw
> > >>> [ 1834.464197] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
> > >>> [ 1834.662979] dib0700: firmware started successfully.
> > >>> [ 1835.168928] dvb-usb: found a 'Terratec Cinergy HT USB XE' in warm state.
> > >>> [ 1835.168997] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
> > >>> [ 1835.169355] DVB: registering new adapter (Terratec Cinergy HT USB XE)
> > >>> [ 1835.419963] DVB: registering frontend 0 (DiBcom 7000PC)...
> > >>> [ 1835.499932] xc2028 1-0061: creating new instance
> > >>> [ 1835.499932] xc2028 1-0061: type set to XCeive xc2028/xc3028 tuner
> > >>> [ 1835.499932] input: IR-receiver inside an USB DVB receiver as /class/input/input7
> > >>> [ 1835.510406] dvb-usb: schedule remote query interval to 150 msecs.
> > >>> [ 1835.510416] dvb-usb: Terratec Cinergy HT USB XE successfully initialized and connected.
> > >>> [ 1835.510696] usbcore: registered new interface driver dvb_usb_dib0700
> > >>>
> > >>> The led on the device switched on when I performed the first scan.
> > >>
> > >> Other meaningful info:
> > >> stefano@geppetto ~> dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> > >> Unable to query frontend status
> > >> stefano@geppetto ~> sudo dvbscan  /usr/share/dvb/dvb-t/it-Cagliari
> > >> Unable to query frontend status
> > >> stefano@geppetto ~> ls -l /dev/dvb/adapter0/
> > >> total 0
> > >> crw-rw---- 1 root video 212, 1 2008-09-23 00:04 audio0
> > >> crw-rw---- 1 root video 212, 6 2008-09-23 00:04 ca0
> > >> crw-rw---- 1 root video 212, 4 2008-09-23 00:04 demux0
> > >> crw-rw---- 1 root video 212, 5 2008-09-23 00:04 dvr0
> > >> crw-rw---- 1 root video 212, 3 2008-09-23 00:04 frontend0
> > >> crw-rw---- 1 root video 212, 7 2008-09-23 00:04 net0
> > >> crw-rw---- 1 root video 212, 8 2008-09-23 00:04 osd0
> > >> crw-rw---- 1 root video 212, 0 2008-09-23 00:04 video0
> > >>
> > >> stefano@geppetto ~> uname -a
> > >> Linux geppetto 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux
> > >>
> > >> The device is reported to be supported on the DVB wiki:
> > >> http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_USB_XE
> > >>
> > >> Help or hints will be appreciated.
> > >>
> > >> Regards.
> > >
> > > I believe I have seen a message like this when something else
> > > is talking to the card already.  For instance, I run my cards in a Mythtv 
> > > system, and in mythtv there is a setting to only attach to the card when 
> > > actually using the card.  If that
> > > setting is set incorrectly, mythtv will attach to the card at startup, 
> > > and keep exclusive use of the card, not allowing
> > > anyone else to access the card at all.
> > 
> > lsof didn't show any device accessing to device inside /dev/dvb.
> > 
> > But digging again in the web I found this:
> > http://forums.opensuse.org/archives/sf-archives/archives-software/archives-multimedia/340016-dvb-t-card-cant-scan-10-3-a.html
> > 
> > So the problem seems a regression in the dvb-apps.
> > 
> > And precisely the problem seems to be in the function:
> > libdvb/dvbfe.c:dvbfe_get_info()
> > 
> > Debugging I get this in dvbfe_get_info (second invocation during the
> > running of the application):
> > 
> > dvbfe_get_info (fehandle=0x8beb008, 
> >                querymask=DVBFE_INFO_LOCKSTATUS,
> >                result=0xbfada108, 
> >                querytype=DVBFE_INFO_QUERYTYPE_IMMEDIATE,
> >                timeout=0) at dvbfe.c:23
> > 
> > 		if (querymask & DVBFE_INFO_LOCKSTATUS) {
> > 			if (!ioctl(fehandle->fd, FE_READ_STATUS, &kevent.status)) {
> > 				returnval |= DVBFE_INFO_LOCKSTATUS;
> > 			}
> > 		}
> > 
> > The result of the ioctl is 0 so the returnval is ored with
> > DVBFE_INFO_LOCKSTATUS (so set to 1), then we have in the main:
> > 
> > 				if (dvbfe_get_info(fe, DVBFE_INFO_LOCKSTATUS, &feinfo,
> > 				    			DVBFE_INFO_QUERYTYPE_IMMEDIATE, 0) !=
> > 					DVBFE_INFO_QUERYTYPE_IMMEDIATE) {
> > 					fprintf(stderr, "Unable to query frontend status\n");
> > 					exit(1);
> > 				}
> > 
> > 
> > 
> > which is different from DVBFE_INFO_QUERYTYPE_IMMEDIATE = 0, so the
> > exit, but I can really understand the logic here.
> > 
> > So what's the expected exit of the ioctl with FE_READ_STATUS?
> 
> I read the log, and I see that apparently no changes has been
> performed in the last two years on the affected code, so I tend to
> believe that this isn't a regression in the utility but rather some
> problem in the module/kernel.
> 
> So a pointer to the documentation of that ioctl would be nice,
> meaninwhile I'll check for the w_scan application.

Which seems to work, so maybe (again) it's a dvb/libdvbapi
problem. Any hint is welcome.

Regards.

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