Even easier way to activate dynamic debugging at module load time (assuming your kernel has dynamic debugging enabled):
modprobe si2168 dyndbg==pmf Cheers, -olli On 4 June 2015 at 21:28, Antti Palosaari <cr...@iki.fi> wrote: > > > On 06/04/2015 08:36 PM, Hurda wrote: >> >> How can I enable debug-output to get the log-messages like >> >> http://git.linuxtv.org/cgit.cgi/media_tree.git/tree/drivers/media/dvb-frontends/si2168.c#n164 >> ? > > > Compile kernel with dynamic debugs. After that you could enable debugs: > modprobe si2168; echo -n 'module si2168 =pft' > > /sys/kernel/debug/dynamic_debug/control > > Antti > > >> >> Am 28.05.2015 07:26, schrieb Antti Palosaari: >>> >>> On 05/28/2015 01:27 AM, Hurda wrote: >>>> >>>> Hello. >>>> >>>> I think I came across a bug in either of the drivers si2168 and dvbsky >>>> regarding >>>> blind-scanning DVB-T2-frequencies. >>>> >>>> HW: Technotrend CT2-4400v2 (afaik based on or the same as DVBSky T330) >>>> demod: Si2168-B40 >>>> tuner: Si2158-A20 >>>> OS: Ubuntu 15.04 (kernel 3.19) >>>> >>>> In Austria, the DVB-T2-service "SimpliTV" is currently airing up to four >>>> muxes, next to one or two DVB-T-muxes. >>>> In my region, the frequencies are 490MHz, 546MHz, 690MHz, 714MHz for >>>> DVB-T2, >>>> and 498MHz for DVB-T. >>>> These numbers might be of interest when reading the logs. >>>> >>>> The peculiar aspect of these T2-muxes is that they're aired on PLP 1 >>>> without >>>> there being a PLP 0. I think this is also the root of my problem. >>> >>> >>> dvbv5-scan is working, but w_scan not? >>> >>> Could you hack si2168.c file and test? >>> >>> if (c->delivery_system == SYS_DVBT2) { >>> /* select PLP */ >>> cmd.args[0] = 0x52; >>> cmd.args[1] = c->stream_id & 0xff; >>> // cmd.args[2] = c->stream_id == NO_STREAM_ID_FILTER ? 0 : 1; >>> cmd.args[2] = 0; >>> cmd.wlen = 3; >>> cmd.rlen = 1; >>> ret = si2168_cmd_execute(client, &cmd); >>> if (ret) >>> goto err; >>> } >>> >>> Antti >>> >>>> >>>> >>>> When doing a blind-scan using w_scan 20140727 on Ubuntu 15.04 (kernel >>>> 3.19), >>>> w_scan does not find any of these four DVB-T2-muxes. >>>> It just finds the DVB-T-mux. >>>> >>>> Logs: >>>> media-tree_dmesg_lsusb.txt http://pastebin.com/0ixFPMSA >>>> media-tree_w_scan.txt http://pastebin.com/yyG3jSwj >>>> >>>> The found transponder: >>>> initial_v3_media_build_trunk.conf http://pastebin.com/LmFQavpy >>>> initial_v5.conf http://pastebin.com/Jx6kymVt >>>> >>>> I also tried a fresh checkout from git.linuxtv.org as of last weekend >>>> and the >>>> most recent w_scan version (20141122). >>>> >>>> As you can see, w_scan tries to tune(?) the DVB-T2-frequencies, but >>>> ultimately doesn't find anything on them. >>>> >>>> >>>> Then I tried the DVBSky-linux-driver[1] >>>> (media_build-bst-20150322.tar.gz)[2] >>>> from their site, which is using a binary called sit2 for this card. >>>> Using this driver, w_scan found all four DVB-T2-muxes and the DVB-T-mux. >>>> Additionally, it found the DVB-T2-muxes during the DVB-T-scan. >>>> >>>> Logs: >>>> media_build-bst_dmesg_lsusb.txt http://pastebin.com/vJeDMxtu >>>> media_build-bst_w_scan.txt http://pastebin.com/yhwAYjen >>>> >>>> Found transponders: >>>> initial_v3_bst.conf http://pastebin.com/ECKQvRWX >>>> initial_v5_bst.conf http://pastebin.com/CbhY6Hpz >>>> >>>> Of course, doing a channel-scan using dvbv5-scan on these transponders >>>> worked >>>> too: >>>> >>>> dvbv5_sit2.conf http://pastebin.com/3W52bbhv >>>> dvbv5_sit2.log http://pastebin.com/nc66PTkt >>>> >>>> Afterwards, I tried to do a channel-scan with the same initial >>>> tuning-file >>>> using the opensource-driver, which also worked: >>>> >>>> dvbv5_si2168.conf http://pastebin.com/A6FbqUL1 >>>> dvbv5_si2168.log http://pastebin.com/ewyVPJR2 >>>> >>>> This should verify that tuning PLP 1 without there being PLP 0 is not >>>> the issue. >>>> >>>> >>>> Additionally, if you compare the two channel-lists, you find interesting >>>> differences: >>>> >>>> The scan with si2168 has AUTO for "MODULATION" and "INVERSION" for >>>> DVB-T2-channels, and for "CODE_RATE_LP" and "INVERSION" for >>>> DVB-T-channels. >>>> >>>> The scan with sit2 has the respective values in the channel-list. >>>> >>>> The dvbv5-scan-logs also differ, as using sit2 also displays the signal >>>> quality >>>> during tuning. >>>> >>>> >>>> I know that there were changes regarding DVB-T2-scanning[3], but as the >>>> blog- >>>> article specifically mentions si2168 and w_scan to be fully >>>> dvbv5-compliant >>>> and good for using with DVB-T2, I thought you should know about this >>>> particular problem. >>>> >>>> >>>> In the attachment I've packed the previously linked logs, for archival >>>> reasons. >>>> >>>> >>>> Thank you for your attention. >>>> >>>> [1] http://www.dvbsky.net/Support_linux.html >>>> [2] http://www.dvbsky.net/download/linux/media_build-bst-150322.tar.gz >>>> [3] http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html >>>> >>>> PS: Interesting comments regarding auto-detection for si2168: >>>> >>>> http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html?showComment=1427233615765#c8591459871945922951 >>>> >>>> >>>> >>>> http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html?showComment=1427234034259#c6500661729983566638 >>>> >>>> >>> >> > > -- > http://palosaari.fi/ > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
