TheGrebs.com:IRC Logs:#mythtv:2005:02:24

---	Log	opened Thu Feb 24 00:00:48 2005
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01:17	Chutt	heh
01:17	Chutt	i remember neil
01:17	Chutt	crazy
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03:18	woodefec	hey there
03:18	woodefec	i have just compiled the mythtv from sources
03:19	woodefec	it asks me about access to mysql database - well - i have it instaled but i know totally nothing about that
03:19	Chutt	read the docs, you missed steps.
03:19	Chutt	as well as the topic of this channel.
03:21	woodefec	Chutt: thx
03:21	woodefec	ill go to the other chan
03:21	woodefec	but one thing: does it mean i need to install it again?
03:21	Chutt	no, it means you need to read the docs.
03:22	woodefec	:D
03:24	woodefec	ok i might be wanting to read te docs i got with mythtv
03:24	woodefec	c u
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10:03	_GeckoFiend	chutt around?
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11:24	Wildgoose	dopester: you around?
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11:29	johnp	Wildgoose, He'll be at work, no irc
11:33	johnp	He'll probably be around @ 11:00pm GMT
11:34	Wildgoose	Aha, john, perhaps you can help
11:34	johnp	go on
11:34	Wildgoose	I have traced my segfaults back to Jan 26th cvs dies. Jan 22nd cvs ok... Biggest change in between is the new dvb stuff...
11:35	Wildgoose	I'm pretty sure it's the new cvs code which is causing massive numbers of segfaults for me on all recent cvs builds
11:35	johnp	well that narrows it down :)
11:35	Wildgoose	Now, here are the symptoms. What I would like is some advice on disabling bits of code to try and narrow it down please?
11:35	Wildgoose	OK
11:35	Wildgoose	It's more frequent when recording. In fact it might only be when recording
11:36	Wildgoose	It seems to be slightly more frequent on channel changing. But perhaps not
11:36	Wildgoose	It happens even when just recording and with no frontend
11:36	johnp	did you change those deletes to delete[] ?
11:36	Wildgoose	It's always a memory problem with new/free in libstdc++ via libqt-mt
11:36	Wildgoose	Yep. No change
11:37	Wildgoose	I also patched the mysql libs like suggested in another thread and have also tried very latest cvs
11:37	Wildgoose	I have a feeling it might be to do with the background sip parser/scanner
11:37	Wildgoose	Is there something like that which runs more frequently while recording is going on?
11:37	johnp	hmm well that should be easy to disable
11:37	Wildgoose	In fact ny code at all which is looping fast during recordings only?
11:38	Wildgoose	OK, fire away
11:38	Wildgoose	I have a brandnew up to date cvs fresh checked out now
11:38	johnp	Hang on, I'll have to look myself
11:38	johnp	you've switched off EIT ?
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11:39	Wildgoose	Yep, never turned it on
11:40	johnp	I think that setting scanner to null line 97 tv_rec.cpp should do it
11:40	johnp	might be a few issues that aren't caught by it.
11:41	Wildgoose	ok, can I still get live tv then, or schedule some shows to record?
11:41	johnp	I think it's more of a nicety than a requirement
11:41	johnp	it went in quite late.
11:41	johnp	don't create the thread on the next line either.
11:42	johnp	you're not OnDemand ing are you ?
11:42	Wildgoose	nope
11:42	johnp	just a thought
11:42	Wildgoose	nor ts recording
11:43	johnp	It's really weird, been running this stuff for ages and not seen a problem.
11:43	Wildgoose	Hmm, fair enough
11:44	Wildgoose	I get a segfault usually within minutes
11:44	Wildgoose	Any recording sees segfaults about every 5-10 mins
11:44	Wildgoose	I have tried turning off nptl, no joy
11:44	Wildgoose	also it doesn't segfault under valgrind (which is very strange)
11:45	Wildgoose	Changing the compile flags for stackalignment changes where the crash occurs which leads me to think it might be some local variable which is getting clobbered and overwriting something else later
11:45	Wildgoose	qt 3.3.3
11:46	Wildgoose	Backend also uses up about 7% cpu on my P2.8...
11:46	Wildgoose	I assume thats the scanner running?
11:47	johnp	hmm 2% on my P3.0
11:47	johnp	(when not doing anything much)
11:47	Wildgoose	Hmm, still drawing 6% right now. I think a signal monitor thread is starting? Where would I find that?
11:48	johnp	dvbchannel
11:48	johnp	think that's an easy stop
11:48	Wildgoose	ok, is this ok to disable?
11:48	johnp	think so
11:48	Wildgoose	died almost immediately I hit live tiv...
11:49	Wildgoose	0xb66129cf in _int_malloc () from /lib/libc.so.6
11:49	Wildgoose	I see a lot of that
11:49	johnp	make sure it's not something that you've provoked by removing the scanner.
11:49	Wildgoose	this one came from jobqueuestart when the thread was initialising
11:49	johnp	ugh
11:50	GreyFoxx	oh :)
11:50	Wildgoose	They are somewhat random, but usually seem to be triggered by the qt strings memory allocs
11:50	Wildgoose	recompiling with proper debug symbols. Hang on. Will also disable the other scanner
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11:54	Wildgoose	OK, I think I have disabled that other scanner. Got the backend running long enough to change a few channels, so it's looking ok temporarily
11:54	Wildgoose	I get a lot of these: free(): invalid pointer 0x80b7388!
11:55	Wildgoose	How can I find out where they are coming from?
11:55	Wildgoose	They just scroll up the screen...
11:55	johnp	good question
11:55	Wildgoose	(Oh, now it segfaults in malloc_consolidate())
11:56	Wildgoose	Happened immediately after the scheduler ran and then this line appeared in the log: 2005-02-24 16:54:33.585 Started recording "To Trap a Spy" on channel: 5 on cardid: 1, sourceid 1
11:56	johnp	could do with a debug allocator and a function that checks the heap/stack
11:56	Wildgoose	Is that a clue?
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11:57	Wildgoose	Is there such a tool?
11:57	johnp	I can only think of a commercial one
11:58	Wildgoose	Strange that valgrind isn't finding it?
11:58	thor_	so probably a timing issue ....
11:58	Wildgoose	I could turn on a "hardened" kernel and see if that traps it. This adds canaries on most variables
11:58	Wildgoose	Agree
11:58	johnp	threads
11:59	johnp	Just spotted a pass by ref on a string for a signal
11:59	Wildgoose	I am using pthreads right now, but have tried nptl as well.
11:59	Wildgoose	hmm
12:00	johnp	I doubt that's the problem though. Especially since you've switched the scanner off.
12:00	Wildgoose	Isaac had suggested already turning one of the signal defs to pass by const Qstring &
12:00	Wildgoose	Yeah, just compiling up the version without the signal monitor as well
12:00	Wildgoose	Want to tell me the reference and I can put a printf on it to see if it's called at all?
12:01	johnp	ServiceScanUpdateText
12:02	johnp	What's the snow like down there then ?
12:02	Wildgoose	hardly any today
12:03	Wildgoose	just a bit of rain (south london)
12:03	thor_	lots here
12:03	Wildgoose	pretty nasty a few days ago though
12:03	Wildgoose	Where are you?
12:03	johnp	Managed to get snowed in today :) Yorkshire
12:03	thor_	D.C.
12:03	Wildgoose	Thor: I bet you get nice now though... not wet useless manky snow...
12:03	Wildgoose	now==snow
12:04	thor_	lived in London for 3 years, despised winter there, really awful
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12:09	johnp	do you have a lot of scheduled recordings etc ?
12:09	Wildgoose	quite a few
12:09	johnp	I'm just wondering what's provoking this.
12:09	Wildgoose	I often schedule stuff to always record if it's a series and these mount up in the dead bin
12:10	Wildgoose	I can have a look, but I think it's between 40 and 100 schedules
12:10	Wildgoose	It's not crashing much at the moment. Often on channel change seems to provoke it. But even just sitting there recording something and it goes down every 5-10 mins
12:11	Wildgoose	ok, running now without siscanner and also without signal monitoring thread. That signal is definitely not firing
12:11	johnp	(didn't think it would be)
12:11	Wildgoose	agree
12:13	Wildgoose	cpu dropped off, so it looks like the signal monitoring thread consuming that 6% cpu...
12:13	Wildgoose	nothing died yet... Not conclusive, but interesting...
12:13	johnp	that's not good
12:13	johnp	6%
12:13	johnp	start putting stuff back in ?
12:14	johnp	(after leaving it running for a while)
12:18	Wildgoose	hang on. Gotta test it for a good while
12:19	Wildgoose	Wasted all of yesterday thinking I had tracked it down when I just hadn't waited long enough
12:19	Wildgoose	Seems to happen more easily when the machine is under load, eg watching and recording, hence suspect timing or something else being part of the problem
12:21	Wildgoose	ok, it's not dying as fast, so I'm going to leave it recording for an hour or two and then start to suspect something in the signal monitor thread
12:21	Wildgoose	Will report back if it crashes, otherwise I think we may have localised it to the signal monitor
12:21	Wildgoose	Cheers
12:21	johnp	I think I'm going to download purify and try with that
12:21	Wildgoose	cool
12:22	Wildgoose	that would be really helpful
12:22	johnp	Well you never know.
12:22	johnp	Might find all kinds of nasties.
12:22	Wildgoose	that thread has turned up lots of may backtraces
12:23	Wildgoose	Isaac suggested changing some of the definitions on the signals, eg the emit in MonitorLoop in case of a compiler bug with qt
12:23	johnp	Well looking at the code, I'm beginning to wonder about it
12:23	Wildgoose	Where?
12:24	johnp	dunno how thread safe it is.
12:24	Wildgoose	The old signal monitor always used to segfault on me.... I assume this is a rewritten one....?
12:24	johnp	To some degree. I wasn't paying attention when Jesper moved it etc.
12:25	Wildgoose	Hmm, if it's the same old code, then it used to segfault all the time on me before...
12:25	Wildgoose	Backend is still alive by the way...
12:25	johnp	I think dopster fixed somethings with it.
12:27	Wildgoose	Where do you think it isn't threadsafe?
12:27	Wildgoose	Can't see anything too worrying myself?
12:27	johnp	I worry about the setting of exit and running, also the use of fdfrontend
12:28	johnp	It's probably fine and just me worrying.
12:28	Wildgoose	exit is never initialised?
12:29	johnp	in MonitorLoop
12:30	Wildgoose	Oh yeah. So you think the card fd is not safe too call from any other thread whenever it feels like?
12:30	Wildgoose	sounds plausible
12:30	johnp	Sounds plausible, but I thought it should be ok due to how it's used in dvbchannel
12:31	johnp	anyone got any thoughts as to why Chutt thinks a const ref is better than a QString in a signal ?
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12:41	_GeckoFiend	johnp Because a const ref is more efficient to pass around... Because you shouldn't be passing a non-const ref as a parameter unless you expect it to be modified...
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12:51	Chutt	whee
12:51	_GeckoFiend	he lives!
12:51	Chutt	barely
12:57	johnp	yeah, I get that. I guess I'm wondering if it's safe to pass a QString via a signal or if it needs to be copied in some form or is an emit thought to thread safe in some way.
12:58	Chutt	it should be safe
12:58	johnp	good enough for me
12:59	Chutt	it's _imagine_ that perhaps adding a new fd for that thread to read from might be better
12:59	Chutt	and that code really shouldn't be using signals, it should be sending events
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13:00	Chutt	maybe something's getting fucked up because it's trying to reuse the same fd in two different threads?
13:01	_GeckoFiend	Chutt heh I had started the don't use signals use events comment in response to johnp then backpsaced over it after you "it should be safe" comment
13:01	Chutt	signals get handled in the same thread they were sent from
13:01	Chutt	ie, they'd be in the signal monitor thread
13:01	Chutt	events get handled in the qt/ui thread
13:02	Chutt	so.. not great either way, but..
13:04	johnp	ok, I'll try and sort it out
13:04	Chutt	well, i wouldn't bother unless wildgoose reports back that it doesn't crash if that thread's disabled. =)
13:04	johnp	yeah
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13:56	Wildgoose	"Wildgoose reporting back...": It's still up and running, has recorded a couple of programs and has been left on live tv for a couple of hours now. This means it's almost 99% likely that it was the dvb signal strength monitor which has been causing my problems
13:58	Wildgoose	I'm going to assume its sorted though and try and get a working frontend now! Thanks John and others for helping me track this down
14:08	Chutt	you'll have to retest once johnp sees about changing it to use a different fd for that thread
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14:40	_rkulagow_	so that plextor capture thing with the hardware mpeg-4. i'm assuming that since it will be hardware encoded you won't need to jump through hoops (endless bitching in -users about .nuv format and the mpeg-4 that it carries) to view it on windows machines / mplayer. it should be just like the pvr-250 files, right? mpeg-4 with a .nuv filename?
14:41	Chutt	nope.
14:42	_rkulagow_	well, re-reading what i wrote i know pvr-250 is mpeg-2 with a .nuv filename. what's the "nope" apply to?
14:44	thor_	still need 'um container format
14:47	Chutt	it doesn't produce a real file
14:47	Chutt	just compressed video frames
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14:49	_rkulagow_	ah, there you go then.
14:54	gr8nash	is this the plextor device you are talking about PX-M402U?
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14:57	gr8nash	is it a taboo question?
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15:04	Chutt	err, what device did you think we were talking about?
15:04	Chutt	they've only got one hardware mpeg4 encoder.
15:07	gr8nash	ok i didnt know how many devices they had. thank you
15:07	Chutt	you could have figured that out by going to their website
15:07	Chutt	or reading the mailing lists.
15:08	gr8nash	i do read the mailing list religously
15:08	gr8nash	but i must have missed it
15:08	Chutt	there was a whole thread about it
15:08	gr8nash	k
15:08	Chutt	with the model #s in the subject, even
15:10	johnp	hmm, looks like I've got some work to do then.
15:10	Chutt	don't think it'd be difficult
15:11	_GeckoFiend	so this client has a moral officer who sends out a quote of the day.. I offered "Until they become conscious they will never rebel, and until after they have rebelled they cannot become conscious."
15:11	_GeckoFiend
15:11	_GeckoFiend	as a suggestion, and she accepted it
15:11	Chutt	just have to open another fd in DVBChannel::Open() and pass that to the signalmonitor class instead
15:11	Chutt	or pass in the cardnum and make the signalmonitor class handle it itself
15:12	Chutt	or just kill the thread entirely, and make it check the signal on demand from DVBChannel
15:13	johnp	right
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15:21	Chutt	johnp, err, is the only thing using the signalmonitor right now the scanner?
15:23		TheWildgoose \| Here's an annoying bug. If the backend dies while the frontend is viewing a show, then when the show ends the frontend comes up with the generic "backend gone away" msg, but then the main frontend window disappears, but the frontend doesn't actually "crash" properly and die (and hence my restart script doesn't restart it either). I think I posted a backtrace from this state a few days back, but it should be easy to repro.
15:24		TheWildgoose \| I haven't investigated how to fix it myself.... (Sorry). Babies crying and my folks fly in tomorrow... Desperately cleaning the house...
15:24	Chutt	heh
15:25		TheWildgoose \| by the way, the dvd strength monitor seems to run way too frequently. I should have thought once per sec was enough?
15:26	Chutt	i would have thought never would be enough, since nothing's using it apart from the scanwizard.
15:26	Chutt	but hey, not my code
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15:34		TheWildgoose \| agree
15:34		TheWildgoose \| Chutt: If you were able to fix that segfault on the preview screen, or drop me a private note on where I need to look to fix it myself I would be in seventh heaven!
15:35	Chutt	i know what i need to do to fix it
15:35	Chutt	hard to explain, though
15:35	Chutt	just have to find the time
15:39	rt	Q: using a bt878 and an 800mhz celeron, what video size/compression/framerate should I configure mythtv to use?
15:41	Beirdo	A: go to #mythtv-users
15:41		* rt sighs.
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15:47	johnp	I was just thinking about that. Think I'll try and sort that as well.
15:47	johnp	err, Monitor running too often that is.
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15:54	johnp	Wildgoose, which dvb driver are you using ?
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16:00	mtjs	anyone awake ?
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16:03		TheWildgoose \| johnp: I have two nova-t cards. One is the old one which uses the driver in kernel, the other is the very new version which needed a cvs fest of stuff to make it work in 2.6.9
16:03		TheWildgoose \| Oh, and I'm using 2.6 kernel with low latency stuff enabled. It's very low latency as well!
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16:05	johnp	I was wondering what size ints the frontend was expecting for the stat ioctls ? (Think they should be pointed to by function ptrs at the bottom of the frontend files)
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17:19	johnp	Wildgoose ?
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17:30	johnp	Well I've got a patch for signalmonitor. It now only runs if it's being used from scanwiz. (calls dup on the fd as well). I think the reason it ran all the time was a hangover from stat gathering which doesn't seem to happen now. The only other thing I've done is increase the size of two of the stat vars to 32bits.
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17:56		TheWildgoose \| Cool. Would be happy to test it out, especially if it just drops into cvs?
17:56		TheWildgoose \| My parents are about to arrive tomorrow, so it may take me a little while to test it though. Sorry
17:57		TheWildgoose \| Oh nuts, just realised you posted to the list... Sorry all
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18:12	Dibblah	Is anyone successfully running mysql-4.1 with current CVS?
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18:52	Chutt	geckofiend, around at all?
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19:13	pandect	Hello
19:14	pandect	Anybody here?
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19:25	mikegrb	nope
19:27	pandect	Awesome
19:28	pandect	I was thinking of building a MythTV Linux PVR -- but had a question before starting: Is HDTV over cable not supported by any capture cards? Or do some cards support this?
19:30	thor_	whomever did that unique-identifier stuff needs to be strung up
19:32	gecko	chutt yeah
19:32	---	User: *** gecko is now known as Geckofiend
19:33	Geckofiend	pandect QAM is supported yes. and see /topic for more info
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19:35	thor_	and have their ball sack placed in an hydraulic vice
19:35	Geckofiend	so how do you REALLY feel?
19:35	Geckofiend	let it all out
19:35	Geckofiend	stop holding back
19:36	thor_	don't get me started
19:37	NightMonkey	pandect: Try #mythtv-users for that question.
19:38	Chutt	heh
19:38	Chutt	thor, what unique identifier stuff?
19:38	thor_	as a substitute for hostname in settings
19:39	pandect	MightMonkey: The nice tip about QAM running over cable lines seems to be doing me well for now :)
19:39	pandect	thanks Geckofiend
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20:17	Chutt	heh
20:18	Chutt	"Apple's management indicated it expects the long term trend for DVR appears to be headed toward commodity status, and we believe Apple wants to stay focused on selling select proven products."
20:18	Captain_Murdo	\| kinda like mp3 players are commodities. :)
20:19	Chutt	heh
20:19	Chutt	well, you don't get a dvr free with your cable/satellite sub
20:21	Chutt	err, mp3 player
20:21	Chutt	not dvr
20:21	Captain_Murdo	\| :)
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20:26	Geckofiend	heh too bad the cable company DVRs suck so badly
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20:28	Chutt	eh, they'll all get better
20:29	Geckofiend	they're like the AOL of PVRs adds everywhere right now
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20:37	mikegrb	Geckofiend: really, my cable company pvr had no ads
20:38	Geckofiend	the TW one in columbus my friend has is full of adds in the EPG
20:38		* Captain_Murd never sees his cable company's ads.
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20:38	Captain_Murdo	\| ah, on-screen?
20:38	Geckofiend	yeah
20:40	dopester	yeah the guide of the ones ive seen here are littered with crap like that
20:41	thor_	Chutt, where's that quote from?
20:41	mikegrb	that sucks
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21:48	Skaface	sigh
21:49	Skaface	i have an analog tuner, and also a digital tuner
21:49	Skaface	i can get either of them working fine seperately
21:49	Skaface	but when i set up myth to use them both (different channels for each card) it only wants to change to the digital tuners channels
21:50	Skaface	it worked fine in the .16 cvs version that i had
21:50	Skaface	but not in this .17 release
21:50	mikegrb	your irc client is broken too
21:50	Skaface	why do you say that?
21:51	mikegrb	it's sending stuff to the wrong channel
21:51	Skaface	strange
21:51	mikegrb	or it could be user error just like your myth problem
21:51	Skaface	oh shit sorry
21:51	Skaface	wrong channel
21:51	Skaface	:D
21:52	Skaface	but you are quick to assume its a user error
21:52	mikegrb	you are quick to assume it isn't
21:52	Skaface	ive played around with it for about 3 hours
21:53	mikegrb	that doesn't change anything
21:53	mikegrb	I'd try #mythtv-users
21:53	Skaface	yeah thats where i meant to have this conversation
21:53	Skaface	sorry
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23:34	Gorbulas\|iBoo	\| my myth is busted :'(
23:35	Gorbulas\|iBoo	\| I have 6GB of free space, but the backend stops recording soon after it starts
23:35	Gorbulas\|iBoo	\| the only error message I can find is "strange error flushing buffer"
23:36	Gorbulas\|iBoo	\| could it be a v4l problem? I recently upgraded my kernel
23:37	mikegrb	you need to read stuff
23:37	Gorbulas\|iBoo	\| it records fine for a few minutes, but a few minutes only
23:37	mikegrb	like mythtv settings
23:37	mikegrb	and the channel topic
23:37	Gorbulas\|iBoo	\| where?
23:37	Gorbulas\|iBoo	\| I remembered the channel topic thing after about the third message
23:38	mikegrb	and you still continued?
23:38	Gorbulas\|iBoo	\| I'm used to #name being support and #name-dev being development
23:38	mikegrb	that maked you dumb
23:39	Gorbulas\|iBoo	\| but I do have something that would be more fitting to tell devs: I cannot change up channels, only down
23:39	Gorbulas\|iBoo	\| I changed to channel 8 a few days ago, and then I couldn't change back to 296
23:41	mikegrb	remember the topic thing
23:42	Gorbulas\|iBoo	\| I'm only reporting that it doesn't work so that a developer can look into it
23:42	Gorbulas\|iBoo	\| it might be related to external tuners being used on cards that have internal tuners
23:46	mikegrb	not interested
23:46	mikegrb	go to the user support channel
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23:51	Baylink	mikegrb: mightn't you be being a touch rough on people who don't get it?
23:52	mikegrb	Baylink: nah
23:52	mikegrb	Baylink: being nice doesn't work
23:52	mikegrb	95% of the time anyway
23:52	Baylink	I dunno, Beirdo and I seem to succeed with it, most of the time.
23:52	mikegrb	felt a little bit about that guy earlier, Skaface as he apologized for the mistake
23:52	mikegrb	but people like this guy keep going anyway
23:53	Baylink	Yeah, I know.
23:53	Baylink	ANd he's still not getting it, over there...
23:54	Beirdo	all your topics are belong to us
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---	Log	closed Fri Feb 25 00:00:37 2005