IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 30 April 2013 (all times are UTC)
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| 09:22 | <dimmah1> jetpipe crashes after sending to print. Errrorlog: "/dev/usb/lp0 9101 not writable". Printer HP P1102, Ubuntu 12.04. How to make it writable?
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| 09:26 | <luette> hey guys. is there a way with ltsp to set up host specific configuration files? eg. my krb5.keytab ist different for each host but needed for our login routine.
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| 10:54 | <alkisg> luette: you can put all of them in the image, e.g. in /etc/ltsp/krb5.keytab-pc05, and then symlink each one of them with RCFILE_01="ln -sf /etc/ltsp/krb5.keytab-$(hostname) /target/path/krb5.keytab"
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| 11:14 | <Joanet> Hi all
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| 11:15 | Do you know why when I click on "Shutdown" on a thin client it only does a logoff, not a thin client shutdown?
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| 11:15 | I'm using Ubuntu 12.04 x64
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| 11:16 | alkisg : Skype is finally working doing skype --secondary using localapps
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| 11:17 | <alkisg> Cool. About shutdown, read this: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/491940
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| 11:31 | <Joanet> alkisg : thanks for the info. I'm applying the patch using your repo. I'll tell you how it works
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| 11:34 | <luette> @alkisg: thx, i will have a try with this
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| 11:40 | <alkisg> Joanet: don't use the repo in 12.04
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| 11:40 | it'll just mess up your ltsp installation
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| 11:40 | Read comment #28 about it
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| 11:41 | "we didn't upload a patched gnome-session in the ts.sch.gr PPA for 12.04, it's only there for 10.04."
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| 11:50 | <Joanet> oops
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| 11:51 | I'll stop the dist upgrade
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| 11:51 | i've tested the epoptes soution and it works perfectly
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| 11:51 | thanks
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| 14:15 | <sbalneav> Monring all
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| 15:04 | <jammcq> sbalneav: Scotty !!!!!!!!!!!!!!!!!
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| 15:45 | <sbalneav> jammcq: Morning!
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| 15:46 | <jammcq> sbalneav: dude, 5 weeks
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| 16:11 | <sbalneav> jammcq: I know!
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| 16:11 | I can taste the Scoma's now.
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| 16:32 | <jammcq> heh
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| 19:49 | <ltspuser_28> Hello
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| 19:50 | <alkisg> Hi
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| 19:51 | <ltspuser_28> I have a problem with an LTSP setup
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| 19:51 | server is a 32 CPU Xeon with 128GB of ram
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| 19:51 | RAID 1+0 SAS
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| 19:52 | 2x 1Gbps LACP ethernet
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| 19:52 | connected to Juniper EX4200 switches
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| 19:52 | switches are linked via 2x 10Gbps for 20Gbps
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| 19:52 | * Hyperbyte drools | |
| 19:52 | <ltspuser_28> we have 85 clients
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| 19:53 | <Hyperbyte> Tell me more.
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| 19:53 | <ltspuser_28> running heavy Firefox usage
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| 19:53 | <ltspuser_28> at around 53 users, we start getting system freeze up
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| 19:53 | <ltspuser_28> the system simply stops responding and the load spikes to 30+
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| 19:54 | or process in the queue spikes to 30+
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| 19:54 | the CPUs in question are Xeon E4600 8 core 2.67GHz CPUs
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| 19:54 | top of the line
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| 19:54 | <Hyperbyte> ltspuser_28, Firefox is a resource hog.
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| 19:54 | <ltspuser_28> we have the ability to increase memory allocation to 512GB of ram but the system is not using more than 37GB total
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| 19:55 | <Hyperbyte> As in, it completely rapes hardware. Easily uses several hundred MB of RAM with only a few tabs open, not to mention a lot of CPU.
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| 19:55 | What kind of clients do you have?
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| 19:55 | <ltspuser_28> We are using Diskless Workstation 1700 Clients,
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| 19:55 | all brand new
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| 19:55 | <alkisg> "53" sounds weird... so with 45 clients everything's fine, and with 55 there are freezes?
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| 19:55 | <ltspuser_28> we upgraded from older models
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| 19:55 | <ltspuser_28> 55 is starting to freeze up
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| 19:56 | and 67 is unbearable
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| 19:56 | <Hyperbyte> ltspuser_28, DLWS 1700 clients can easily handle Firefox as a local application.
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| 19:56 | It'll greatly improve performance of browsing too, it'll fix any problems you might have with flash.
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| 19:56 | <ltspuser_28> at around 45 clients, process in the queue is (top) at 5
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| 19:57 | at 55 it is at 10
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| 19:58 | <alkisg> LDM_DIRECTX is true or false?
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| 20:00 | <alkisg> (10:58:37 μμ) alkisg: LDM_DIRECTX is true or false?
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| 20:00 | <ltspuser_23> Hyperbyte, got knocked off
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| 20:00 | LDM_DIRECTX is true
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| 20:00 | X over SSH
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| 20:00 | <alkisg> True means no ssh
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| 20:00 | <ltspuser_23> sorry
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| 20:00 | false
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| 20:00 | we are running X over SSH
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| 20:01 | btw, we are running Ubuntu 12.04LTS as the server OS
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| 20:01 | XFCE as the desktop environment
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| 20:02 | <ltspuser_23> in addition, the CPUs E4600 2.67GHz 8x core (4x CPU total = 32 physical cores) hyperthread (Linux sees as 64 CPUs)
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| 20:02 | <alkisg> Can you try with LDM_DIRECTX=True just to verify that the ssh encryption is actually the main bottleneck?
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| 20:03 | <ltspuser_23> I can do that tonight once the users are gone for the day
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| 20:03 | if that does not work, should we first disable Flash for the users, and then try Firefox as local app
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| 20:03 | <alkisg> You won't be able to easily simulate user traffic though...
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| 20:03 | (once they're gone :D)
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| 20:04 | <ltspuser_23> Also we can put Google Chrome, how is that compare with Firefox in terms of CPU usage
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| 20:04 | <alkisg> Firefox as a local app should solve the problem, yeah
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| 20:04 | The app doesn't matter, as long as it sends screen updates, ssh needs a lot of cpu to encrypt them
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| 20:04 | <ltspuser_23> The users are using websites that are heavy in AJAX and Javascript, that is what their jobs require
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| 20:05 | <alkisg> Screen updates are the problem, not background scripts per se
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| 20:05 | Just an `ls -R /` in an xterm would need a lot of CPU as well
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| 20:05 | <ltspuser_23> ah, I see
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| 20:06 | ok, let me first disable X over SSH tonight (LDM_DIRECT=True) and see what happens tomorrow
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| 20:06 | if that does not help, remove Flash
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| 20:06 | if that does not help, move Firefox to Local App
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| 20:06 | <Hyperbyte> ltspuser_23, are your users currently using flash?
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| 20:06 | <ltspuser_23> I would want to do one change at a time
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| 20:06 | yes
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| 20:06 | they are
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| 20:07 | <alkisg> `top` should also tell you the apps that need the most cpu... either sshd, or the firefox plugin container (flash)
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| 20:08 | <ltspuser_23> yes, I observer it is always Firefox at the top of the CPU usage list, at least the top 30 processes, I just was not sure if it is Firefox proper or Flash within Firefox
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| 20:08 | <alkisg> firefox == ajax, javascript etc. plugin-container == flash. sshd == ldm_directx=false
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| 20:09 | <ltspuser_23> got it
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| 20:09 | it is Firefox at the top, definitely
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| 20:09 | so it is AJAX and Javascript
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| 20:10 | I know the website responsible for this, and it is what every user used to perform their job
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| 20:13 | Ok, excellent information. I will disable X over SSH tonight and observe that the next day and if the is still performance issues, run Firefox on local app more. I will report my findings tomorrow, and for Hyperbyte and alkisg, I very much appreciate your help. It is also very nice to help management purchase the top of line networking and server equipment.
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| 20:13 | <alkisg> Then do give google chrome a try, I hear they have a faster javascript engine
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| 20:14 | <ltspuser_23> last question, should I replace Firefox with Chrome
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| 20:15 | ok, we will try all of them. Thank you for your help alkisg and Hyperbyte.
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| 20:20 | <Hyperbyte> ltspuser_23, sure. :)
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| 20:22 | <unkmar> I found it. Was digging around for screen-session.d :)
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| 20:31 | Hmm.
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| 20:43 | <unkmar> XRANDR_OUTPUT01 example?
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| 20:44 | nevermind. found it in your irclogs.
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| 20:55 | <unkmar> I'm having a problem. so I set XRANDR_OUTPUT_01="VGA" and the resolution goes horribly low. 800x600? 1024x768?
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| 20:55 | brb.
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| 21:00 | * unkmar is back | |
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| 21:21 | <unkmar> vagrantc: you there? I'm having problems again. :(
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| 21:25 | <vagrantc> unkmar: i've got a couple minutes
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| 21:25 | <unkmar> okay, I got the IPAPPEND problem fixed. still not sure what my deal with xrandr settings is.
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| 21:26 | I simply want: xrandr --output LVDS-1 --off
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| 21:27 | * vagrantc is not real experienced with xrandr | |
| 21:27 | * vagrantc vaguely recalls XRANDR_COMMAND_NN= | |
| 21:28 | <unkmar> well, what I have works but... the screen resolution appears to default to around 800x600, Maybe as much as 1024x768. Looks stretched and ugly. :/
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| 21:29 | <Hyperbyte> unkmar, see:
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| 21:29 | !lts.conf
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| 21:29 | <ltsp> lts.conf: http://manpages.ubuntu.com/lts.conf
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| 21:29 | <unkmar> yep, 1024x768. :(
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| 21:29 | <Hyperbyte> XRANDR_COMMAND_0 = --output LVDS-1 --off
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| 21:29 | Should work
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| 21:30 | If not you can disable it via kernel parameters
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| 21:30 | But that's more tricky.
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| 21:30 | <vagrantc> unkmar: ... XRANDR_COMMAND_0=--output LVDS-1 --off
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| 21:30 | yeah ,that
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| 21:31 | <unkmar> blah, blah, done well other way. Trying to do proper way so easily fix later if/when encounter again. :)
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| 21:31 | and thanks.
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| 21:31 | <unkmar> so, yeah, I needed the lts.conf lines. Had not attempted the _COMMAND option.
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| 21:32 | <vagrantc> it's relatively newish
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| 21:38 | <unkmar> well, that still didn't work. :(
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| 21:38 | guess I can put that line back in the I10-xrandr where ever that file si.
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| 21:38 | s/si/is
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| 21:40 | okay, so that sort of works. After login.
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| 21:44 | the XRANDR_COMMAND_0 works after login.
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| 21:46 | okay, maybe it isn't. I still had a xrandr line in my users .xsessionrc. :/
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| 21:47 | <Hyperbyte> unkmar, I've had similar problems.
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| 21:47 | To be honest.
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| 21:48 | I contacted the company where I bought my thin clients, and they provided some script that hacked an xorg.org where LVDS was disabled and that did work.
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| 21:49 | <Hyperbyte> I've never investigated this enough to file a bug report, but there might be something wrong with the XRANDR_* bits in lts.conf
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| 21:49 | <unkmar> Hyperbyte: odd, seeing as how that is suppose to be executed in the exact same spot. :(
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| 21:49 | <Hyperbyte> Anyway, g'night - bedtime. :)
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| 21:49 | <vagrantc> XRANDR_COMMAND_0 definitely runs before LDM login or not at all...
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| 21:50 | <unkmar> So... You guys will get all defensive if I debug it and make a suggestive fix. :D
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| 21:50 | Not that I have one at the moment. Just saying.
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| 21:53 | <vagrantc> no, we love patches
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| 21:58 | although there is sometimes the possibility that it's fixed upstream
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| 21:58 | <unkmar> yeah, I know.
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| 21:58 | <vagrantc> i.e. a newer version, not yet released version
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| 23:59 | <gdi2k> greetings all! I'm currently using slower, outdated PCs as terminals with LTSP and it's good. But they're big, ugly, noisy, power hungry and they run hot so I need more AC. The Atom-based clients seem overpriced for what they are, but ARM clearly holds a lot of promise. I've tried the Pi but wasn't satisfied with graphics performance, I couldn't get sound working and USB can be flaky. Is anyone using any sort of low cost ARM boards / mini PCs / sticks successfu
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| 23:59 | lly with LTSP?
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