IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 4 December 2015 (all times are UTC)
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| 01:12 | <bennabiy> What is the best way to update the repo that build-client pulls from?
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| 01:13 | I want to update the ubuntu mirror
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| 07:40 | work_alkisg is now known as alkisg | |
| 07:47 | <alkisg> championofcyrodi: yup, it's one of the main reasons we haven't yet upgraded from 12.04 to 14.04
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| 08:30 | <fiesh_> after upgrading the client system, glxinfo no longer works when run on the server, giving GLXBadContext. But client-local opengl works fine. Does anyone have a hint on how to find the issue? Nothing appears to be logged.
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| 08:32 | (software rendering via unsetting LIBGL_ALWAYS_INDIRECT does work)
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| 08:37 | <alkisg> fiesh_: "when run on the server" ==> do you mean when you are using a thin client and are connected to the server?
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| 08:38 | <fiesh_> yes
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| 08:38 | I suppose it's an issue of an xorg driver having been updated
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| 08:39 | <alkisg> Was opengl working for you previously? That's strange, which distro/version are you using?
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| 08:39 | <fiesh_> yes, gentoo
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| 08:39 | <alkisg> I don't think opengl over the network has been working for a long time...
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| 08:39 | Hmm, I wonder how gentoo was managing that
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| 08:39 | <fiesh_> it all was fine, and I did a world update onnn the client image
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| 08:39 | opengl over network used to work perfectly fine here
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| 08:39 | we need it, we develop applications that use opengl ;)
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| 08:40 | but ok, I guess there's no easy way, so I'll restart from an older backup of the client's image and see which update breaks it
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| 08:40 | <alkisg> I'm very curious on which versions that old system has, that makes it work without indirect/software rendering
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| 08:40 | For now, I'll assume that you had software rendering and you just didn't realize it
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| 08:41 | <fiesh_> hah I would beg to differ
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| 08:41 | <alkisg> I do hope you're right
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| 08:41 | <fiesh_> I do know I'm right ;)
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| 08:41 | <alkisg> And you're saying that this happened without you using http://www.virtualgl.org/ or anything, right?
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| 08:41 | Nor fat clients or localapps...
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| 08:42 | <fiesh_> I installed virtualgl at some point, but then realized that it was the opposite of what I wanted -- rendering on the server's graphics card (which doesn't even exist)
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| 08:43 | <alkisg> Right
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| 08:43 | <fiesh_> so yes, it's simply setting LIBGL_ALWAYS_INDIRECT to 1 and having apps run on the server use their respective X displays glx implementation
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| 08:44 | <fiesh_> it worked so well that even playing quake3 was perfectly possible, however the game builds up some lag after a while
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| 08:44 | but applicationns like FreeCAD work very well
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| 08:44 | <alkisg> What client cpu?
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| 08:44 | <fiesh_> Intel(R) Core(TM) i3-5010U CPU @ 2.10GHz
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| 08:45 | <alkisg> That's good enough to do software rendering. OK, let me test `ssh -X server app`, it should do opengl if what you're saying is correct.
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| 08:46 | <fiesh_> software rendering also works, obviously, but is slower by a factor of 10 or so
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| 08:46 | <alkisg> When you revert to what you had working, please do paste the output of glxinfo
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| 08:46 | <fiesh_> you cannot actually work with software rendering, which is why I need to fix this update issue
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| 08:46 | where shoudl I paste it?
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| 08:46 | I have it here, booted the backup image
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| 08:46 | <alkisg> E.g. to pastebin or paste.debian.net, and then the link here
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| 08:47 | ssh -X from i915 to i915 gives me: OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits)
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| 08:47 | That's software rendering, isn't it?
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| 08:47 | <fiesh_> http://pastebin.com/fQnmnvug
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| 08:48 | not sure what gallium was
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| 08:48 | <alkisg> llvmpipe is software rendering, but you don't have that in your paste
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| 08:48 | What is localhost:17.0?
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| 08:48 | Are you using LDM_DIRECTX=True?
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| 08:48 | <fiesh_> yes
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| 08:49 | at least it's in lts.conf, I hope it's respected
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| 08:49 | never actually checked
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| 08:50 | <alkisg> I think with LDM_DIRECTX it would be localhost:0.0
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| 08:50 | !localxterm
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| 08:50 | <ltsp`> localxterm: Any applications that you launch on a thin client actually runs on the server, not on the client itself. If you want to open a program on the client locally, you can type 'ltsp-localapps <program>' in a run dialog or in a terminal. For example, 'ltsp-localapps xterm' to open a terminal running on the client.
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| 08:50 | <alkisg> Open a localxterm, then check /var/cache/ltsp/ltsp_client_env
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| 08:51 | <fiesh_> hmm that file doesn't exist for me
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| 08:51 | <alkisg> If I set LIBGL_ALWAYS_INDIRECT=1, then I'm getting: X Error of failed request: GLXBadContext
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| 08:51 | Is there a /var/cache/ltsp folder?
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| 08:52 | <fiesh_> yeah, it contains the ltsp_config
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| 08:52 | <alkisg> ltsp_config_env, sorry
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| 08:52 | <fiesh_> which only has SERVER and NFS_SERVER set annd ignores all my other settings it seems
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| 08:52 | <alkisg> Are your settings in /etc/lts.conf?
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| 08:52 | <fiesh_> ah
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| 08:52 | hmm, there is no mention of LDM_DIRECTX in there
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| 08:53 | <alkisg> You may also try `getltscfg -a`
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| 08:53 | <fiesh_> which now proves my suspicions that the lts.conf was always ignored, haha
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| 08:53 | <alkisg> It works in previous ltsp versions or if you're root, but not as user on newer ltsp versions
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| 08:53 | Hehe, that makes network traffic much slower
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| 08:55 | <fiesh_> hmm, the /etc/lts.conf is simply empty
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| 08:55 | I have my local lts.conf in /tftpboot/ltsp/amd64/lts.conf, is that incorrect?
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| 08:55 | <alkisg> What is your chroot arch? i386?
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| 08:55 | <fiesh_> x86_64
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| 08:56 | also, I use ipxe to load the kernel since i-forget-the-other-name never worked
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| 08:57 | <alkisg> Do you have this in your chroot? /usr/share/ltsp/init-ltsp.d/05-getltsconffile
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| 08:57 | Are you using IPAPPEND 3?
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| 08:58 | <fiesh_> yes to the first question, I don't know what IPAPPEND 3 is ;)
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| 08:59 | <alkisg> fiesh_: since this is gentoo which I'm quite unfamiliar with, would you mind sharing your screen with me so that we debug this faster?
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| 08:59 | !vnc-dide
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| 08:59 | <ltsp`> vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
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| 09:00 | <alkisg> (replace the apt-get bit with something suitable for gentoo, of course)
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| 09:00 | <fiesh_> ok, hold on, never used vnc in my life, I normally use shared tmux sessions and the likes.. give me a second
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| 09:01 | <alkisg> fiesh_: ah, this will do as well, if you have socat/screen
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| 09:01 | No need for X then
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| 09:01 | !socat
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| 09:01 | <ltsp`> socat: One way to share a console with a remote person is: [local pc] forward port 5500; apt-get install socat; socat tcp-listen:5500,keepalive=1 stdio,raw,echo=0 [remote pc] apt-get install socat screen; socat SYSTEM:"sleep 1; exec screen -xRR ra",pty,stderr tcp:REMOTE-IP:5500 & screen -l -S ra
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| 09:01 | <fiesh_> hold on a second
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| 09:01 | <alkisg> socat SYSTEM:"sleep 1; exec screen -xRR ra",pty,stderr tcp:81.186.20.0:5499 & screen -l -S ra
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| 09:01 | Whatever of those two suits you
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| 10:14 | <alkisg> Hmm it might be related to systemd/logind not flagging the thin client session as active, and to changes to xorg that prevent drm from working on not active sessions
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| 15:35 | work_alkisg is now known as alkisg | |
| 15:36 | <alkisg> bennabiy: see the raspberrypi page for an example on how to specify mirrors, ppa etc
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| 15:36 | !raspberrypi
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| 15:36 | <ltsp`> raspberrypi: (#1) Ubuntu/LTSP on Pi 2: https://help.ubuntu.com/community/UbuntuLTSP/RaspberryPi, or (#2) Debian/LTSP (with raspbian chroot) on Pi: http://cascadia.debian.net/trenza/Documentation/raspberrypi-ltsp-howto/, or (#3) unofficial Ubuntu/LTSP (with raspbian chroot) on Pi: http://pinet.org.uk/
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| 15:36 | <alkisg> The first one
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| 15:40 | <bennabiy> alkisg: thank you
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| 15:42 | EXTRA_MIRROR?
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| 15:42 | I would like to replace archive.ubuntu.com with a faster mirror
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| 15:43 | <alkisg> plain mirror then
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| 15:43 | there's mirror, early_mirror, extra_mirror, you want the plain one
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| 15:43 | there's also a command line parameter for this, ltsp-build-client --extra-help shows it
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| 15:48 | <bennabiy> that is what I could not remember... thank you
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| 15:49 | I could do MIRROR=.... ltsp-build-client
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| 15:49 | right?
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| 15:50 | <alkisg> yup
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| 15:50 | You can also use the caching parameters
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| 15:50 | that store the .debs you download so that the next times it's very faster
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| 15:50 | <bennabiy> good call
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