IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 10 May 2009   (all times are UTC)

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07:22
<rcmysoft>
helo, i have a 1000/100/10 Mbit Nic and 100/10 Switch which Cabel should i use for my LTSP Server. Cat5, Cat5e or Cat6? Thank you.
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10:37
<jhaig|home>
I have a problem with the graphics on a client. Moving the mouse causes interference on the screen - horizontal lines flashing at random. I guess this is due to incorrect X settings (refresh rates, etc), but what might I need to change?
10:45
<alkisg>
jhaig|home: that's with the ancient S3's ?
10:45
<jhaig|home>
It was detected as an s3virge
10:46
<alkisg>
jhaig|home: I had the same problem in one of my labs: flickering because of the lab current, but worked fine at home. I had to work it in a lower resolution, i.e. instead of the native 1440x900@75Hz I had to work it at 1366x768@75 Hz.
10:47
If you change resolutions from the system > preferences menu, does the flickering go away?
10:49
<jhaig|home>
Hmmm, I've just found another problem. The screen went blank (after a few minutes inactivity) and now it has come back but the keyboard and mouse don't work. :-/
10:49
<alkisg>
Try changing VTs (Alt+Ctrl+F1 and then back to Alt+Ctrl+F7)
10:50
<jhaig|home>
Didn't work. It is rebooting now.
10:53
This time it booted up in a much lower resolution - looks like 800x640.
10:53
and no flicker
10:54
800x600. It doesn't give me an option for higher resolution.
10:56
<alkisg>
Hmm? Why's that? Does it still use the s3virge driver?
10:58
<jhaig|home>
Now I have just logged out and back in (ie, restarting X) and it has switched back to the higher resolution for the login screen. Then I logged it and it went back to 800x600 but gave me other options. 832x624 appears to be the highest I can get with no flicker.
10:59
<alkisg>
Did you also try the different refresh rates (if you have any)?
11:00
<jhaig|home>
It only gives me one option - 75Hz.
11:00
<alkisg>
That's with a tft monitor, right?
11:00
<jhaig|home>
Can I force that in the lts.conf?
11:00
Yes, it is a tft
11:01
although there is also a crt I can try.
11:01
<alkisg>
Yes, but do you want to? You may damage the monitor if you send it an incorrect refresh rate. Rare, but can happen.
11:01
I bet there will be no flickering with the crt... (at least in my lab it wasn't, with 85Hz refresh rate)
11:01
<jhaig|home>
It is saying the monitor is unknown, but presumably with the model type I can find the correct refresh rate from somewhere.
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11:06
<alkisg>
jhaig|home: to force the refresh rate, you set X_HORIZSYNC and X_VERTREFRESH, see the docs
11:06
!docs
11:06
<ltspbot>
alkisg: "docs" is For the most current documentation, see http://wiki.ltsp.org/twiki/bin/view/Ltsp/LtspDocumentationUpstream
11:07
<alkisg>
E.g. you may set X_VERTREFRESH=60-75
11:08
<jhaig|home>
Thanks. First I'm trying the CRT. I think I switched to the TFT before I got the graphics working at all so perhaps it will be OK.
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11:09
<jhaig|home>
No, still flicker. I'll try setting X_VERTREFRESH
11:10
<alkisg>
jhaig|home: which resolution/refresh rate did you try with the crt?
11:10
E.g. 1024x768@85 Hz?
11:14
<jhaig|home>
I cannot remember. The login screen was whatever was detected, and there was flicker, but when I logged in it changed to the 800x600, which is now set for the user.
11:16
<alkisg>
You may delete the default user resolution: rm ~/.config/monitors.xml
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11:32
<jhaig|home>
OK, after playing around with it a bit, I have found that 1024x768@60Hz works without flicker. Would this 60Hz be the vertical or horizontal refresh rate? It doesn't specify.
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13:38
<hal14450>
i would like some recommendations as to how powerful a server i should be using for ~10 clients the likely target for this setup will be a community center with client machines donated and hopefully the server as well.The intended audience will most likely be kids so i'd like a rough idea of what kind of resources i should expect to need on the server.
13:40
<knipwim>
http://www.ltsp.org/~sbalneav/LTSPManual.html#requirements
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13:42
<hal14450>
knipwim, thanks i'll read that over but i'm also looking for some advice gleaned from real world experience
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13:51
<knipwim>
i got only 1 client :)
13:59
<alkisg1>
knipwim: depends on what the kids will do :)
13:59
*sorry, hal14450 ^^^
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14:17
<hal14450>
alkisg, that's something i don't know just yet but i do have a starting point as a metric for now
14:18
<alkisg>
hal14450: e.g. if they're going to watch youtube fullscreen or run windows apps with wine, you'll need a lot more powerful server than if they're just going to run openoffice... :)
14:19
<vagrantc>
heh. and i always thought openoffice was a little on the brutal side :)
14:20
<alkisg>
Really? I have very low CPU/bandwidth usage with swriter...
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14:27
<vagrantc>
maybe that's just my memories of the early days of diskless terminals at freegeek, where our powerful server was a PPRO 200MHz with 200MB of ram... :)
14:27
dual PPRO, that is
14:27
<alkisg>
Wow... and the clients?
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14:28
<vagrantc>
alkisg: 486 and early pentiums
14:29
long time ago now ... but still, i remember staroffice bringing it to a halt
14:29
<alkisg>
I didn't even know linux existed back in the 486 days :)
14:29
<vagrantc>
pfft.
14:29
linux was written to take advantage of the featuers of the 386 processor, no?
14:30
<alkisg>
Yeah, but back then the internet was almost non-existent in Greece
14:30
<vagrantc>
fair enough
14:31
<alkisg>
200MHz / 200Mb RAM... Heh, that's about as powerful as my clients now :P
14:32
(worst one is 300MHz/64 RAM)
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16:41
<vahnx>
I just setup LTSP and it worked fine until I rebooted. Clients can no longer PXE boot into the LTSP server
16:42
sudo /etc/init.d/openbsd-inetd restart doesn't fix it either
16:43
Ah, starting the dhcp3 server helped.
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