[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #42 from julius...@gmail.com ---
i tested with the latest kaffeine and can confirm that this bug is solved.
Since this is a general feature, it also affects other programs. Does it make
sense to mention this at other places? for instance, the same thing affects
w_scan, where i could not find the higher voltage option yet.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #41 from Mauro Carvalho Chehab  ---
It could be interesting to place the photo you took at:
   https://linuxtv.org/wiki/index.php/TechniSat_SkyStar_S2

The IS61V256 is an EEPROM memory (32 KB). The 24118A is part of the Conexant
DVB-S2 chipset: cx24118/cx24120. Both are controlled by the same frontend
driver.

With regards to the problems you're reporting, based on those "cannot open" log
messages, it seems that either you're lacking permissions to access a subdir on
your home directory (chown -R your_user:your_group /home/your_user would fix),
or your home partition is full. Kaffeine uses a file pipe to communicate with
libVLC. If it can't create such pipe, it won't work.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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julius...@gmail.com changed:

   What|Removed |Added

 Attachment #107278|overview of the card with   |The Technisat SkyStar2 with
description|some chips marked   |opened lid of the HF cage
   ||near the connector. There
   ||are no chips on the
   ||backside.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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--- Comment #40 from julius...@gmail.com ---
Created attachment 107278
  --> https://bugs.kde.org/attachment.cgi?id=107278=edit
overview of the card with some chips marked

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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--- Comment #39 from julius...@gmail.com ---
Thanks for looking in to this! i tried to test, but the device cannot be
selected for scan, although it is plugged in (attached two screenshots). This
seems to be a different problem, but i cannot test the new version of kaffeine.

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--- Comment #38 from julius...@gmail.com ---
Created attachment 107277
  --> https://bugs.kde.org/attachment.cgi?id=107277=edit
...but the source (device) cannot be selected

Side problem during test with latest kaffeine from git (2017-08-14)

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--- Comment #37 from julius...@gmail.com ---
Created attachment 107276
  --> https://bugs.kde.org/attachment.cgi?id=107276=edit
The device seems to be present

Side problem during test with latest kaffeine from git (2017-08-14)

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

Mauro Carvalho Chehab  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|UNCONFIRMED |RESOLVED

--- Comment #36 from Mauro Carvalho Chehab  ---
Git commit d076c5b64a1d2949d1bc3938e58c7d3fda0f6d64 by Mauro Carvalho Chehab.
Committed on 13/08/2017 at 20:50.
Pushed by mauroc into branch 'master'.

dvb: add a tristate to allow set higher/normal LNBf voltage

Some DVB devices have an optional ioctl that allows changing
between normal voltage for LNBf (13V/18V) to a higher voltage
mode (usually, 14V/19V), meant to compensate for voltage loss
on long cabling. Without that, it is not possible to properly
switch the polarization.

Add a tristate check box to allow enabling/disabling this via
ioctl.

Signed-off-by: Mauro Carvalho Chehab 

M  +1-0src/dvb/dvbbackenddevice.h
M  +4-0src/dvb/dvbconfig.h
M  +32   -14   src/dvb/dvbconfigdialog.cpp
M  +4-1src/dvb/dvbconfigdialog.h
M  +2-0src/dvb/dvbdevice.cpp
M  +14   -0src/dvb/dvbdevice_linux.cpp
M  +1-0src/dvb/dvbdevice_linux.h
M  +2-0src/dvb/dvbmanager.cpp

https://commits.kde.org/kaffeine/d076c5b64a1d2949d1bc3938e58c7d3fda0f6d64

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #35 from Mauro Carvalho Chehab  ---
(In reply to Mauro Carvalho Chehab from comment #11)
> (In reply to juliushar from comment #10)
> > On the VLC side (version 2.2 stable), when exiting VLC before the line 
> > 
> > if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)
> > 
> > in function 
> > 
> > int dvb_set_sec (dvb_device_t *d, uint64_t freq_Hz, char pol,
> >  uint32_t lowf, uint32_t highf, uint32_t switchf)
> > 
> > in file
> > 
> > modules/access/dtv/linux.c
> > 
> > , kaffeine will fail with many channels as mentioned. But when exiting after
> > that if block (its actually rather this line which is relevant), kaffeine
> > will work nicely.
> > 
> > (in which area of the kaffeine code source does such functionality belong
> > to?)
> 
> Let me try to understand it better. This ioctl sets the LNBf voltage

Actually, no. This ioctl is defined only for a few devices. It switches from
"normal" voltage mode (13V/18V) to a "higher" voltage mode, that adds 1V, in
order to compensate for cable loss (e. g. 14V/19V). Very few DVB devices
implements it. That's why I missed on the first time I looked into it.

I just added a new configuration option to DVB-S/S2 that will allow enabling
this ioctl at Kaffeine. On tri-state mode, it won't use the ioctl at all, just
like before. That prevents a lot at libdvbv5 that would otherwise happen if
called and the device doesn't support it:

13-08-17 18:07:58.265 [Critical] kaffeine.dev: FE_ENABLE_HIGH_LNB_VOLTAGE:
Operation not supported

Checking the box will enable the higher voltage mode; unchecking the normal
mode.

In any case, the previous Kernel patch that detects current overflow sounds a
good idea, so I'm pushing it to the Kernel tree.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #34 from Mauro Carvalho Chehab  ---
Created attachment 107254
  --> https://bugs.kde.org/attachment.cgi?id=107254=edit
media: isl6421: add checks for current overflow

The enclosed Kernel patch adds an additional logic for Isil 6421 to improve the
power on logic. I suspect that it could fix the issue you're getting, but I
can't test the patch myself.

You'll need to apply the patch to your Kernel and see if it would fix the
issue.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #33 from julius...@gmail.com ---
There is only one PC connected to the LNB at a given time. (The AP82-T2B LNB
provides two independent outputs, but only one is used). When i plug the cable
out of the PC and test the signal with a WS-6933 *, everything looks good. And
with Kaffeine, all the channels that appear also look good. So there is no
problem with the signal strength for the working channels.


*(
https://www.amazon.de/Satlink-WS-6933-Camping-Satfinder-Messger%C3%A4t/dp/B00KXKFKRA/ref=sr_1_1?ie=UTF8=1502564154=8-1=ws6933
)

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #32 from Mauro Carvalho Chehab  ---
(In reply to Mauro Carvalho Chehab from comment #31)
> After looking at isl6421 datasheet, I think I know what may be happening.
> The driver is programmed to use the dynamic current overflow protection.
> Such circuit is meant to protect the device from troubles when it sends a
> current to the LNBf. As stated there:

"as soon as an overload is detected, the output is shut down for a time T
OFF, typically 900ms

 ...

 However, there could be some cases in which a highly capacitive load on
the output may cause a difficult start-up, when the dynamic protection is
chosen. This can be solved by initiating a power start-up in static mode (DCL =
HIGH) and then switching to the dynamic mode (DCL = LOW) after a chosen amount
of time."

The driver currently doesn't implement it, but something occurred to me: do you
have any other device connected to the satellite antenna? When you have
multiple devices connected to the antenna, you need a DiSEqC switch.
Additinally, only one should be powering up the antenna on a given time.

If more then one device is connected, and another device is already powering
the antenna, trying to change the voltage (in order to switch the polarization)
will fail.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #31 from Mauro Carvalho Chehab  ---
After looking at isl6421 datasheet, I think I know what may be happening. The
driver is programmed to use the dynamic current overflow protection. Such
circuit is meant to protect the device from troubles when it sends a current to
the LNBf. As stated there:

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #30 from Mauro Carvalho Chehab  ---
(In reply to Mauro Carvalho Chehab from comment #23)
> (In reply to juliushar from comment #18)
> > ...tested with a different PC, running current Manjaro Linux (KDE) 64 Bit, a
> > new Technisat SkyStar2 DVB card, same LNB. The same problem showed up, on
> > the screenshots it can be seen that the number of channels in kaffeine
> > differs greatly after the workaround. Also, w_scan results will be attached.
> 
> That sounds a Kernel driver bug. Looking at the flexcop-fe-tuner.c, it looks
> that there are several different models of SkyStar2 supported by the driver,
> each with different tuners and different LNB supply chips. The models
> supported by the Kernel are:
> 
> SkyStar2 rev 2.3: mt312
> SkyStar2 rev 2.6: stv0299, tbmu24112
> SkyStar2 rev 2.7: s5h1420, isl6421, itd1000
> SkyStar2 rev 2.8: cx24123, isl6421
> 
> What's the exact model that you have? What Kernel version? I also need the
> Kernel logs with debug info, without the workarond and with the workaround,
> in order to try to identify what's missing there.

Ok, your board is using the entry meant for SkyStar S2 PCI DVB-S/S2 rev 3.3:

static int skystarS2_rev33_attach(struct flexcop_device *fc,
struct i2c_adapter *i2c)
{
fc->fe = dvb_attach(cx24120_attach,
_rev3_3_cx24120_config, i2c);
if (!fc->fe)
return 0;

fc->dev_type = FC_SKYS2_REV33;
fc->fc_i2c_adap[2].no_base_addr = 1;
if (!dvb_attach(isl6421_attach, fc->fe, >fc_i2c_adap[2].i2c_adap,
0x08, 0, 0, false)) {
err("ISL6421 could NOT be attached!");
fc->fc_i2c_adap[2].no_base_addr = 0;
return 0;
}
info("ISL6421 successfully attached.");

if (fc->has_32_hw_pid_filter)
fc->skip_6_hw_pid_filter = 1;

return 1;
}

It uses a cx24120 frontend, with an ISIL 6421 to power up the LNBf. The volrage
control (with switches from V/H polarization) seems to be implemented by the
isl6421 driver. The datasheet for this device is at:

http://www.intersil.com/content/dam/Intersil/documents/isl6/isl6421a.pdf

One thing this chip provides is that it can add an extra 1V to be used when the
antenna cable it too long, in order to compensate for eventual loss.

Apparently, something is not right there, at least for your device. I'll take a
look at the Kernel driver.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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--- Comment #29 from julius...@gmail.com ---
The second system with the same workaround has the following properties:

lspci|grep -i dvb
01:06.0 Network controller: Techsan Electronics Co Ltd B2C2 FlexCopII DVB chip
/ Technisat SkyStar2 DVB card (rev 02)

sudo uname -a
Linux ... 4.9.39-1-MANJARO #1 SMP PREEMPT Fri Jul 21 08:25:24 UTC 2017 x86_64
GNU/Linux

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--- Comment #28 from julius...@gmail.com ---
imprint on the Sat card:

TechniSat DIGITAL 6411-0500-V3.0 SCH-V2.0 

(see attached photo)

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--- Comment #27 from julius...@gmail.com ---
Created attachment 107060
  --> https://bugs.kde.org/attachment.cgi?id=107060=edit
Kaffeine log with workaround

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--- Comment #26 from julius...@gmail.com ---
Created attachment 107059
  --> https://bugs.kde.org/attachment.cgi?id=107059=edit
output from vlc

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--- Comment #25 from julius...@gmail.com ---
Created attachment 107058
  --> https://bugs.kde.org/attachment.cgi?id=107058=edit
Technisat Card Foto

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--- Comment #24 from julius...@gmail.com ---
sudo uname -a
Linux  4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:29:05 UTC 2017 x86_64
x86_64 x86_64 GNU/Linux

lspci|grep -i dvb
03:05.0 Network controller: Techsan Electronics Co Ltd B2C2 FlexCopII DVB chip
/ Technisat SkyStar2 DVB card (rev 02)

directly after startup: 


journalctl -e -k

...
DVB: registering new adapter (FlexCop Digital TV device)
Aug 03 20:27:28  kernel: b2c2-flexcop: MAC address = 00:08:c9:e1:5f:99
Aug 03 20:27:28  kernel: CX24123: wrong demod revision: ee
Aug 03 20:27:28  kernel: shpchp: Standard Hot Plug PCI Controller Driver
version: 0.4
Aug 03 20:27:28  kernel: mt352_read_register: readreg error (reg=127,
ret==-121)
Aug 03 20:27:28  kernel: nxt200x: nxt200x_readbytes: i2c read error (addr
0x0a, err == -121)
Aug 03 20:27:28  kernel: nxt200x: Unknown/Unsupported NXT chip: 00 00 00 00
00
Aug 03 20:27:28  kernel: lgdt330x: i2c_read_demod_bytes: addr 0x59 select
0x02 error (ret == -121)
Aug 03 20:27:28  kernel: stv0297_readreg: readreg error (reg == 0x80, ret
== -121)
Aug 03 20:27:28  kernel: mt312_read: ret == -121
Aug 03 20:27:29  kernel: cx24120: Conexant cx24120/cx24118 - DVBS/S2
Satellite demod/tuner
Aug 03 20:27:29  kernel: cx24120: Demod cx24120 rev. 0x07 detected.
Aug 03 20:27:29  kernel: cx24120: Conexant cx24120/cx24118 attached.
Aug 03 20:27:29  kernel: b2c2-flexcop: ISL6421 successfully attached.
Aug 03 20:27:29  kernel: b2c2-flexcop: found 'Conexant CX24120/CX24118' .
Aug 03 20:27:29  kernel: b2c2_flexcop_pci :03:05.0: DVB: registering
adapter 0 frontend 0 (Conexant CX24120/CX24118)...
Aug 03 20:27:29  kernel: b2c2-flexcop: initialization of 'Sky2PC/SkyStar S2
DVB-S/S2 rev 3.3' at the 'PCI' bus controlled by a 'FlexCopIIb' complete
...

--
journalctl -k -f

start kaffeine (not working)
./kaffeine 
03-08-17 21:19:33.210 [Debug   ] src/backend-vlc/vlcmediawidget.cpp#75: bool
VlcMediaWidget::init(): Using libVLC with args: --no-video-title-show
03-08-17 21:19:33.475 [Info] kaffeine.dvb: src/dvb/dvbmanager.cpp#596: void
DvbManager::loadDeviceManager(): Using built-in dvb device manager  
03-08-17 21:19:33.949 [Debug   ] src/dvb/dvbdevice_linux.cpp#1889: void
DvbLinuxDeviceManager::componentAdded(const QString&): New device detected:
/org/kde/solid/udev/sys/devices/pci:00/:00:14.4/:03:05.0/dvb/dvb0.demux0
 
03-08-17 21:19:33.950 [Debug   ] src/dvb/dvbdevice_linux.cpp#1889: void
DvbLinuxDeviceManager::componentAdded(const QString&): New device detected:
/org/kde/solid/udev/sys/devices/pci:00/:00:14.4/:03:05.0/dvb/dvb0.dvr0
 
03-08-17 21:19:33.950 [Debug   ] src/dvb/dvbdevice_linux.cpp#1889: void
DvbLinuxDeviceManager::componentAdded(const QString&): New device detected:
/org/kde/solid/udev/sys/devices/pci:00/:00:14.4/:03:05.0/dvb/dvb0.frontend0
 
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...): Device Conexant CX24120/CX24118
(/dev/dvb/adapter0/frontend0) capabilities: 
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_2G_MODULATION   
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_1_2 
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_2_3 
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_3_4 
03-08-17 21:19:33.952 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_4_5 
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_5_6 
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_6_7 
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_7_8 
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_FEC_AUTO
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_INVERSION_AUTO  
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: src/dvb/dvbdevice_linux.cpp#81:
void dvbv5_log(int, const char*, ...):  CAN_QPSK
03-08-17 21:19:33.953 [Debug   ] kaffeine.dev: 

[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #23 from Mauro Carvalho Chehab  ---
(In reply to juliushar from comment #18)
> ...tested with a different PC, running current Manjaro Linux (KDE) 64 Bit, a
> new Technisat SkyStar2 DVB card, same LNB. The same problem showed up, on
> the screenshots it can be seen that the number of channels in kaffeine
> differs greatly after the workaround. Also, w_scan results will be attached.

That sounds a Kernel driver bug. Looking at the flexcop-fe-tuner.c, it looks
that there are several different models of SkyStar2 supported by the driver,
each with different tuners and different LNB supply chips. The models supported
by the Kernel are:

SkyStar2 rev 2.3: mt312
SkyStar2 rev 2.6: stv0299, tbmu24112
SkyStar2 rev 2.7: s5h1420, isl6421, itd1000
SkyStar2 rev 2.8: cx24123, isl6421

What's the exact model that you have? What Kernel version? I also need the
Kernel logs with debug info, without the workarond and with the workaround, in
order to try to identify what's missing there.

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--- Comment #22 from julius...@gmail.com ---
Created attachment 106950
  --> https://bugs.kde.org/attachment.cgi?id=106950=edit
w_scan result setup B after workaround

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--- Comment #21 from julius...@gmail.com ---
Created attachment 106949
  --> https://bugs.kde.org/attachment.cgi?id=106949=edit
w_scan result setup B before workaround

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--- Comment #20 from julius...@gmail.com ---
Created attachment 106948
  --> https://bugs.kde.org/attachment.cgi?id=106948=edit
Channel Number setup B after workaround (new channel scan)

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--- Comment #19 from julius...@gmail.com ---
Created attachment 106947
  --> https://bugs.kde.org/attachment.cgi?id=106947=edit
Channel Number setup B before workaround

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--- Comment #18 from julius...@gmail.com ---
...tested with a different PC, running current Manjaro Linux (KDE) 64 Bit, a
new Technisat SkyStar2 DVB card, same LNB. The same problem showed up, on the
screenshots it can be seen that the number of channels in kaffeine differs
greatly after the workaround. Also, w_scan results will be attached.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #17 from julius...@gmail.com ---
i only have one setup available. Since it is reproducible and starts working
with the described workaround, it looks like a software (driver?) issue. The
firmware file for the card is from 
https://github.com/OpenELEC/dvb-firmware/blob/master/firmware/dvb-fe-cx24120-1.20.58.2.fw

. The Technisat SkyStar2 is a very widespread card. Who would be the developer
to ask? Since there is a workaround with vlc, can there be one with kaffeine?

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #16 from Mauro Carvalho Chehab  ---
(In reply to juliushar from comment #15)
> The comparison of the previously attached channelfile without workaround and
> that with workaround shows, that without the workaround, only channels with
> polarization=V appear; while after the workaround [running VLC at least
> until the line 
> 
> if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)
> 
> ], channels with both polarization=V and polarization=H appear (and the
> latter file is larger). Since this problem does not only appear with
> kaffeine, but also with w_scan, could this have to to with the underlying
> system? (which is somehow initialized more comprehensively by vlc).

If you're having the same troubles on other tools, it is very likely that the
problem is elsewhere. Perhaps a hardware malfunction or a Kernel driver issue.
Can you test it with some other hardware?

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #15 from julius...@gmail.com ---
The comparison of the previously attached channelfile without workaround and
that with workaround shows, that without the workaround, only channels with
polarization=V appear; while after the workaround [running VLC at least until
the line 

if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)

], channels with both polarization=V and polarization=H appear (and the latter
file is larger). Since this problem does not only appear with kaffeine, but
also with w_scan, could this have to to with the underlying system? (which is
somehow initialized more comprehensively by vlc).

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #14 from julius...@gmail.com ---

> 
> Let me try to understand it better. This ioctl sets the LNBf voltage
> 
> to what's there at "val". If zero, it sets to 13V; otherwise to 18V:
>if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)
> 
> You're saying that exiting just after setting the voltage and running
> Kaffeine will make it work?
> 
> If so, it seems that either the LNBf settings are wrong in Kaffeine, or the
> channel settings are wrong. That could happen, for example, if the
> Kaffeine's scanfile.dvb definitions for a channel says that it is
> horizontal, but the channel is, in fact vertical.
> 
> What channels are falling? What's your LNBf?


Yes, exiting just after 

if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)

makes it work. And not only the before missing channels, but all channels.
(This also applies to a scan, which will complete with more channels when it
"works"). My LNBf is a AP82-T2B ( http://www.dueemme.com/catalogo/10.40.html )
with two connectors. With more testing, it turns out this effect is also there
with for instance w_scan. Attached are two files, both generated with 

w_scan -f s -c DE -s S19.2E2 -L > Astraplaylist_after_vlc.xspf

, with vlc shortly running between the scans with a channels file as playlist.
>From those files, the "directly working" channels and those missing can be seen
by comparison. (A few might be missing due to random effects). From this list: 

http://de.satexpat.com/sat/ost/19.2/

for instance, 11837 H 27500 3/4 DVB-S QPSK group, including "Das Erste", is
always missing without the workaround.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

julius...@gmail.com changed:

   What|Removed |Added

 Attachment #104788|Channel list with missing   |Channel list: some channels
description|channels|are missing in there

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #13 from julius...@gmail.com ---
Created attachment 104789
  --> https://bugs.kde.org/attachment.cgi?id=104789=edit
complete channels list

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #12 from julius...@gmail.com ---
Created attachment 104788
  --> https://bugs.kde.org/attachment.cgi?id=104788=edit
Channel list with missing channels

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #11 from Mauro Carvalho Chehab  ---
(In reply to juliushar from comment #10)
> On the VLC side (version 2.2 stable), when exiting VLC before the line 
> 
> if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)
> 
> in function 
> 
> int dvb_set_sec (dvb_device_t *d, uint64_t freq_Hz, char pol,
>  uint32_t lowf, uint32_t highf, uint32_t switchf)
> 
> in file
> 
> modules/access/dtv/linux.c
> 
> , kaffeine will fail with many channels as mentioned. But when exiting after
> that if block (its actually rather this line which is relevant), kaffeine
> will work nicely.
> 
> (in which area of the kaffeine code source does such functionality belong
> to?)

Let me try to understand it better. This ioctl sets the LNBf voltage

to what's there at "val". If zero, it sets to 13V; otherwise to 18V:
   if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)

You're saying that exiting just after setting the voltage and running Kaffeine
will make it work?

If so, it seems that either the LNBf settings are wrong in Kaffeine, or the
channel settings are wrong. That could happen, for example, if the Kaffeine's
scanfile.dvb definitions for a channel says that it is horizontal, but the
channel is, in fact vertical.

What channels are falling? What's your LNBf?

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #10 from julius...@gmail.com ---
On the VLC side (version 2.2 stable), when exiting VLC before the line 

if (ioctl (d->frontend, FE_ENABLE_HIGH_LNB_VOLTAGE, ) < 0 && val)

in function 

int dvb_set_sec (dvb_device_t *d, uint64_t freq_Hz, char pol,
 uint32_t lowf, uint32_t highf, uint32_t switchf)

in file

modules/access/dtv/linux.c

, kaffeine will fail with many channels as mentioned. But when exiting after
that if block (its actually rather this line which is relevant), kaffeine will
work nicely.

(in which area of the kaffeine code source does such functionality belong to?)

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #9 from julius...@gmail.com ---
When v4l-utils was made and installed*, the compile of kaffeine** did not fail
anymore. Then, i started vlc, quit, started kaffeine, did a "working" scan of
the programs and tuned into some for test. Then I restarted the computer and
started kaffeine again. Now, many channels were not working. So the problem
still remains unsolved.


*
git describe --tags
v4l-utils-1.12.0-41-gca6a0c0

**
git describe --tags
2.0.6-5-gdbdd21a

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #8 from Mauro Carvalho Chehab  ---
(In reply to juliushar from comment #7)
> (In reply to Mauro Carvalho Chehab from comment #6)
> > (In reply to juliushar from comment #4)

> i compiled v4l-utils and vlc-2.2, but kaffeine compile (git pull from 27.
> Feb. 2017) quits with 
> 
> CMake Error at cmake/modules/FindVLC.cmake:104 (message):
>   Could not find /usr/include/vlc/libvlc_version.h
> 
> the required file is not part of the vlc sources.

Both VLC versions 2.x and 3.x should have libvlc_version.h, but you may need to
install an extra package with the VLC headers. This is what's shipped with
Debian Stretch (with should be somewhat similar to Kubuntu):

 $ dpkg -l libvlc-dev
...
ii  libvlc-dev:amd64  2.2.4-13 
amd64 development files for libvlc

$ dpkg -L libvlc-dev
...
/usr/include/vlc/libvlc_version.h

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #7 from julius...@gmail.com ---
(In reply to Mauro Carvalho Chehab from comment #6)
> (In reply to juliushar from comment #4)
> > ..Some channels work out of the box with kaffeine, for instance BBC World or
> > Kika HD. Those channels are detected with a normal scan, others not. If vlc
> > has been used for Sat reception since last reboot (and then vlc closed), the
> > channel scan detects more channels (for instance "das erste") and can also
> > play them.
> 
> There were some changes since Kaffeine 2.0.4, including some fixes at
> libdvbv5.
> 
> As the last fixes on lidvbv5 happened this week, probably it was not
> backported to the distributions yet.
> 
> Those changes affect DVB-S/S2 reception. Could you please test it with the
> latest version of libdvbv5, compiled from its source, and with Kaffeine,
> also compiled from its source?
> 
> You can get libdvbv5 source with:
> 
> git clone git://linuxtv.org/v4l-utils.git
> 
> And Kaffeine with:
> 
> git clone git://anongit.kde.org/kaffeine
> 
> Also, you may need to select:
>   [ ] Search transponders for other Networks
> 
> in order to get all DVB-S channels, when scanning channels at the "Channels"
> screen. This will make the scan operation slower, but, without such option,
> you may not get all channels on some satellites.

i compiled v4l-utils and vlc-2.2, but kaffeine compile (git pull from 27. Feb.
2017) quits with 

CMake Error at cmake/modules/FindVLC.cmake:104 (message):
  Could not find /usr/include/vlc/libvlc_version.h

the required file is not part of the vlc sources.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

[Mauro Carvalho Chehab]

https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #6 from Mauro Carvalho Chehab  ---
(In reply to juliushar from comment #4)
> ..Some channels work out of the box with kaffeine, for instance BBC World or
> Kika HD. Those channels are detected with a normal scan, others not. If vlc
> has been used for Sat reception since last reboot (and then vlc closed), the
> channel scan detects more channels (for instance "das erste") and can also
> play them.

There were some changes since Kaffeine 2.0.4, including some fixes at libdvbv5.

As the last fixes on lidvbv5 happened this week, probably it was not backported
to the distributions yet.

Those changes affect DVB-S/S2 reception. Could you please test it with the
latest version of libdvbv5, compiled from its source, and with Kaffeine, also
compiled from its source?

You can get libdvbv5 source with:

git clone git://linuxtv.org/v4l-utils.git

And Kaffeine with:

git clone git://anongit.kde.org/kaffeine

Also, you may need to select:
  [ ] Search transponders for other Networks

in order to get all DVB-S channels, when scanning channels at the "Channels"
screen. This will make the scan operation slower, but, without such option, you
may not get all channels on some satellites.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #5 from julius...@gmail.com ---
on the vlc side, this seems to have to do with the function 

static int dvb_vset_props (dvb_device_t *d, size_t n, va_list ap)

where 

if (ioctl (d->frontend, FE_SET_PROPERTY, ) < 0)

gets called 
(file vlc-2.2/modules/access/dtv/linux.c)

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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https://bugs.kde.org/show_bug.cgi?id=374693

--- Comment #4 from julius...@gmail.com ---
..Some channels work out of the box with kaffeine, for instance BBC World or
Kika HD. Those channels are detected with a normal scan, others not. If vlc has
been used for Sat reception since last reboot (and then vlc closed), the
channel scan detects more channels (for instance "das erste") and can also play
them.

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[kaffeine] [Bug 374693] kaffeine does not tune into some dvb-s channels

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julius...@gmail.com changed:

   What|Removed |Added

Summary|kaffeine does not tune into |kaffeine does not tune into
   |dvb-s   |some dvb-s channels

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