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2322 discussions

X2go session broker configuration question
by Simon Gao 18 Jun '20

18 Jun '20

Hi All, I'm trying to set up x2go session broker and following this instruction at wiki:advanced:x2gobroker:loadbalancing [X2Go - everywhere@home]. | | | | | | | | | | | wiki:advanced:x2gobroker:loadbalancing [X2Go - everywhere@home] | | | I'm running into an issue with:sudo x2gobroker-pubkeyauthorizer --broker-url http(s)://<broker-server>:<port>/<basepath>/pubkeys/ What files should I put in /pubkeys/ directory? When I put in one pub key for the session broker, I received following error: 2020-06-09 10:52:39,836 - broker - INFO - Authorizing access to this X2Go server for X2Go Session Broker 2020-06-09 10:52:39,836 - broker - INFO - at URL https://x2gobroker.example.com/pubkeys/x2gobrokerpubkey.pub 2020-06-09 10:52:39,866 - broker - INFO - Found 1 public key at URL https://x2gobroker.example.com/pubkeys/x2gobrokerpubkey.pub Traceback (most recent call last): File "/usr/sbin/x2gobroker-pubkeyauthorizer", line 206, in <module> keytype, pubkey, owner = new_pubkey.rsplit(" ", 2) ValueError: not enough values to unpack (expected 3, got 2) Any help is appreciated. Simon

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Re: [X2Go-User] Matlab graphics performance when running in x2go
by Johannes Töger 18 Jun '20

18 Jun '20

I finally figured it out! Now I can run Matlab R2019b on Ubuntu 18.04 LTS with decent graphics performance over x2go, even with transparency using the Mesa llvmpipe software OpenGL driver. Benchmark for a simple scene: No transparency: ~40 ms per frame With transparency: ~58 ms per frmae So still some performance penalty for transparency, but much better. HOWTO: First install LLVM: sudo apt install llvm-dev I downloaded mesa-20.1.0 (latest version right now) and configured it like this (in the unzipped source directory): mkdir build cd build meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3 -Dprefix=/usr/local/mesa-20.1.0/ Then I built and installed it as follows: ninja sudo ninja install Then to make Matlab load the new driver, I needed to modify Matlab's lib search path: cp $MATLAB_DIRECTORY/bin/.matlab7rc.sh ~ Edit the file ~/.matlab7rc.sh, find the glnxa* section and add /usr/local/mesa-20.1.0/lib/x86_64-linux-gnu to LDPATH_PREFIX Add to your .profile: export MESA_GL_VERSION_OVERRIDE=3.0 Seems like anything will work for the version override except for 3.1, but I didn't debug this further. — Johannes Töger Associate Senior Lecturer Cardiac MR Group Department of Clinical Sciences Lund, Clinical Physiology Lund University, Sweden -----Original Message----- From: Ulrich Sibiller <uli42(a)gmx.de> Sent: Wednesday, May 27, 2020 14:29 To: Johannes Töger <johannes.toger(a)med.lu.se> Subject: Re: [X2Go-User] Matlab graphics performance when running in x2go Thanks! On Wed, May 27, 2020 at 1:59 PM Johannes Töger <johannes.toger(a)med.lu.se> wrote: > > OK I see - we only have CUDA cards in those machines to do computations, so VirtualGL won't work then. > > Maybe I'll try to compile an optimized software Mesa/Gallium -- I'll let you know what happens if I find something interesting, so it's documented on the mailing list at least. > > > — > Johannes Töger > > Associate Senior Lecturer > Cardiac MR Group > Department of Clinical Sciences Lund, Clinical Physiology Lund > University, Sweden > > -----Original Message----- > From: Ulrich Sibiller <uli42(a)gmx.de> > Sent: Wednesday, May 27, 2020 13:20 > To: Johannes Töger <johannes.toger(a)med.lu.se> > Cc: x2go users <x2go-user(a)lists.x2go.org> > Subject: Re: [X2Go-User] Matlab graphics performance when running in > x2go > > On Wed, May 27, 2020 at 1:07 PM Johannes Töger <johannes.toger(a)med.lu.se> wrote: > > > > Thanks for your quick reply. > > > > It turns out that Matlab by default uses an older Mesa software rendering module (17.3) when there is no hardware OpenGL. I tried to compile my own version with additional optimizations and LLVMPipe etc, but Matlab wouldn't accept it. No more time to debug it today, but maybe later. > > > > Is there any documentation on using VirtualGL with x2go? I tried to google it, but no luck. > > Not that I am aware. I have never checked it out practically. > Generally you will have to dedicate the graphics hardware to that > (only) session which might make it a no-go, depending on your setup. > > Uli

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Suspending sessions causes performance slowing down
by h i 17 Jun '20

17 Jun '20

Hello, We've been using x2go for a few months. Recent converts from using the old freenx nomachine 3.5. We installed x2goserver on Ubuntu mate 18.04 and have several users connecting through x2goclient 4.1.2.2 I have a question regarding suspended sessions with x2go. When we suspended an open session, we noticed the session stopped running. After resuming the session the next day, the process resumed executing. Thought this was strange and rebooted the server. Ran a few tests and noticed performance slows after suspending a session. Here is output from gxlgears. You can see the FPS decreases when the session suspends. The FPS returns back to normal (633 at the bottom), upon resuming the session. [cid:d252b9bd-2ad8-4a2a-800c-7e6c2a417eef] I searched online and discovered you can change the /etc/x2go/x2goagent.options to X2GO_NXOPTIONS="sleep=0". When doing this, now the performance increases considerably after suspending the session (middle portion of the output). [cid:4ba36847-76fc-4d46-ad13-1f0165a293c2] Is there a way to suspend an x2go session, and have no decrease or increase in performance? Is there some setting we can change to keep things running as is while session is suspended? Thanks in advance. h

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Re: [X2Go-User] how to select single display
by Ulrich Sibiller 17 Jun '20

17 Jun '20

On Wed, May 27, 2020 at 5:25 PM gian sisal <giansisal19(a)gmail.com> wrote: > > Hi Ulrich,I try to explain it with a picture.. In attach you can see: my x2go Client (windows, ver 4.1.2.0 ... I think it's the latest one) connected to a remote system with 4 physical monitors. The point is: I would like to select "remote monitor #1" (or #2 or #3 or #4) to see it properly .I hope I was clear this time. Yes, thanks. So you are connecting to an existing desktop, a so-called shadow session. There's no option to restrict to only one monitor, you can only connect to whole desktop, that means all 4 monitors together. If your local screen is smaller that the remote desktop your will see the zoomed version which is barely usable. The only thing I can think of is enabling the viewport-mode by pressing ctrl-alt-r and then move to the monitors usign ctrl-alt-left/right/up/down (see /etc/x2go/keystrokes.cfg). Does that help? Uli

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Blender 2.83 crashes
by Shoe Off Head 08 Jun '20

08 Jun '20

Hi, I have a legitimate need to use Blender (not a render farm) remotely for short/light work. I tested X2Go but only Blender 2.79 in the softwaregl mode did run (uses llvm-pipe for OpenGL software rendering). Blender 2.79 in normal mode and Blender 2.83 did crash in normal and softwareql mode. I wonder is real OpenGL (not software OpenGL like llvm-pipe) a No-Go for X2Go? Thanks for your help! P.S.: here is the Blender crash message: # backtrace ./blender(BLI_system_backtrace+0x1d) [0x6989e9d] ./blender() [0xc1548f] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7f601308ef20] ./blender(_Z33GHOST_X11_ApplicationErrorHandlerP9_XDisplayP11XErrorEvent+0x11) [0x17304f1] /usr/lib/x86_64-linux-gnu/libX11.so.6(_XError+0x11a) [0x7f60142d18fa] /usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3d82b) [0x7f60142ce82b] /usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3d8d5) [0x7f60142ce8d5] /usr/lib/x86_64-linux-gnu/libX11.so.6(_XReply+0x240) [0x7f60142cf830] /usr/lib/x86_64-linux-gnu/libXi.so.6(XListInputDevices+0x84) [0x7f6014086d44] ./blender(_ZN15GHOST_SystemX1120refreshXInputDevicesEv+0x5f) [0x1731a3f] ./blender(_ZN15GHOST_SystemX11C1Ev+0x453) [0x1732193] ./blender(_ZN13GHOST_ISystem12createSystemEv+0x35) [0x172eda5] ./blender(GHOST_CreateSystem+0x9) [0x172dc29] ./blender(wm_ghost_init+0x2d) [0xee800d] ./blender(WM_init+0x275) [0xed4135] ./blender(main+0x2a3) [0xb4bf53] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f6013071b97] ./blender() [0xc11c0c]

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Where are x2go compression options explained?
by Anton Driesse 29 May '20

29 May '20

X2Go offers a long list of compression options, obviously with some system behind them. Can anyone tell me where can I find explanations for these? Many thanks! Anton

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how to select single display
by gian sisal 27 May '20

27 May '20

Hi everyone, I already asked about this topic, but no answers until now. So I'm going to ask again: I need to connect to a multi-monitor remote system (CentOS on it), I'm using a windows x2go client: no problems about connection: I'm able to connect to such remote system, but I need to select a single display I want to view on my screen. The actual 4.1.2.0 client version doesn't allow me to do this. Is there any update about this situation? Thanks in advance. Greetings. G

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Re: [X2Go-User] X2Go Kdrive, current status? Ready for official release?
by Mike Gabriel 27 May '20

27 May '20

Hi Alex, hi all, On Mi 27 Mai 2020 11:55:46 CEST, Oleksandr Shneyder wrote: > Am 26.05.20 um 13:45 schrieb Mike Gabriel: >> Hi Alex, >> >> I wonder when would be a good point to get X2Go Kdrive to the majority >> of X2Go users. I will plan some X2Go work for July and this would be a >> good occasion to get a new X2Go Server version out containing the X2Go >> Kdrive wrapper code. >> >> What's the maturity status of X2Go Kdrive? Is it releasable? >> >> If not, we should get an X2Go server release out anyway and make sure it >> behaves well, if no X2Go Kdrive Xserver ist installed server-side. > Hi Mike, > I can't answer this question. My customers are using it productively > since longer than one year, however the number of use cases is limited > here. I didn't see a lot of test reports from other users. So I'm not > able (and don't want to) decide when it's ready for community release. > Maybe some of users, if anyone already tried it, can give some comments > on it. >> >> What do people think about this? @X2Go Users / Devs: what do others thing about the state of X2Go KDrive? Shall we open it up to a wider "audience"? Greets, Mike -- DAS-NETZWERKTEAM c\o Technik- und Ökologiezentrum Eckernförde Mike Gabriel, Marienthaler Str. 17, 24340 Eckernförde mobile: +49 (1520) 1976 148 landline: +49 (4351) 850 8940 GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31 mail: mike.gabriel(a)das-netzwerkteam.de, http://das-netzwerkteam.de

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Matlab graphics performance when running in x2go
by Johannes Töger 27 May '20

27 May '20

Hi everyone, We're running x2go on a compute server. Some of our apps are written in Matlab with interactive GUI:s. We are seeing quite poor graphics performance after moving from Matlab R2014a to R2019a, especially when using transparency in 3D graphics. This might be connected to the fact that Matlab goes into a software OpenGL mode. Does anyone have experience with this? Any solutions? Ubuntu 18.04 LTS MATE desktop environment Matlab R2019a x2goserver 4.1.0.3-0~1708~ubuntu1 libnx-x11-6:amd64 2:3.5.99.22-0+git20190 nxagent 2:3.5.99.22-0+git20190 - Johannes Töger Associate Senior Lecturer Cardiac MR Group Department of Clinical Sciences Lund, Clinical Physiology Lund University, Sweden

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ICE default IO error handler doing an exit(), pid = xxxxxx, errno = 32, Fedora 32
by Robert Kudyba 26 May '20

26 May '20

Pardon the cross post from x2go dev list perhaps someone as seen this. Only affecting 1 workstation. On Fedora 32 with both MATE and XFCE, X2Go immediately quits with > Connection failed. This stackexchange question > <https://unix.stackexchange.com/questions/467507/x2go-unable-to-find-free-di…> suggests > running x2godbadmin --createdb but that doesn't help. > > x2goagent-4.1.0.3-6.fc32.x86_64 > x2goserver-xsession-4.1.0.3-6.fc32.noarch > x2goserver-common-4.1.0.3-6.fc32.noarch > x2goserver-4.1.0.3-6.fc32.x86_64 > > Connection failed. > > /usr/lib64/x2go/x2gocheckport: line 131: > connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in > expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") > Unable to find free display port or insert new session into database; > parameters: port (50), hostname (ourdomain) and session name (). > > May 26 07:35:33 ourhostname /usr/bin/x2gostartagent[95534]: no free > display number available, cannot start new session. Retrying (run 10). > May 26 07:35:33 ourhostname /usr/bin/x2gostartagent[95535]: Unable to find > free display port or insert new session into database; parameters: port > (50), hostname (ourdomain) and session name (). > > cat .xsession-x2go-ourdomain.edu-errors > XSession-x2go: X session started for ouruser at Sun May 24 15:26:31 EDT > 2020 > ** Message: 15:26:33.626: couldn't access control socket: > /run/user/1200/keyring/control: No such file or directory > SSH_AUTH_SOCK=/run/user/1200/keyring/ssh > mate-session[141487]: WARNING: AT-SPI: Could not obtain desktop path or > name > > mate-session[141487]: WARNING: atk-bridge: GetRegisteredEvents returned > message with unknown signature > mate-session[141487]: WARNING: atk-bridge: get_device_events_reply: > unknown signature > mate-session[141487]: WARNING: atk-bridge: get_device_events_reply: > unknown signature > > ** (mate-settings-daemon:141818): WARNING **: 15:26:34.517: Could not open > RFKILL control device, please verify your installation > > ** (mate-panel:141832): WARNING **: 15:26:34.586: AT-SPI: Could not obtain > desktop path or name > > ** (mate-panel:141832): WARNING **: 15:26:34.608: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (mate-panel:141832): WARNING **: 15:26:34.608: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-panel:141832): WARNING **: 15:26:34.608: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-settings-daemon:141818): WARNING **: 15:26:35.152: AT-SPI: Could > not obtain desktop path or name > > > ** (mate-settings-daemon:141818): WARNING **: 15:26:35.154: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (mate-settings-daemon:141818): WARNING **: 15:26:35.154: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-settings-daemon:141818): WARNING **: 15:26:35.154: atk-bridge: > get_device_events_reply: unknown signature > SSH_AUTH_SOCK=/run/user/1200/keyring/ssh > vmware-user: could not open /proc/fs/vmblock/dev > SSH_AUTH_SOCK=/run/user/1200/keyring/ssh > SSH_AUTH_SOCK=/run/user/1200/keyring/ssh > > (caja:141846): Gtk-WARNING **: 15:26:36.752: Failed to register client: > GDBus.Error:org.gnome.SessionManager.AlreadyRegistered: Unable to register > client > Failure: Module initialization failed > > ** (polkit-mate-authentication-agent-1:141982): WARNING **: 15:26:36.825: > AT-SPI: Could not obtain desktop path or name > > > ** (polkit-mate-authentication-agent-1:141982): WARNING **: 15:26:36.829: > atk-bridge: GetRegisteredEvents returned message with unknown signature > > ** (polkit-mate-authentication-agent-1:141982): WARNING **: 15:26:36.829: > atk-bridge: get_device_events_reply: unknown signature > > ** (polkit-mate-authentication-agent-1:141982): WARNING **: 15:26:36.829: > atk-bridge: get_device_events_reply: unknown signature > (uint32 1,) > *** ERROR *** > TI:15:26:39 TH:0x55bef6378ad0 FI:gpm-manager.c > FN:gpm_manager_systemd_inhibit,1786 > - Error in dbus - GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: > Permission denied > Traceback: > mate-power-manager(+0x1d304) [0x55bef5347304] > mate-power-manager(+0x1478b) [0x55bef533e78b] > /lib64/libgobject-2.0.so.0(g_type_create_instance+0x311) > [0x7f90fcf0b1b1] > /lib64/libgobject-2.0.so.0(+0x193f5) [0x7f90fceed3f5] > /lib64/libgobject-2.0.so.0(g_object_new_with_properties+0x275) > [0x7f90fceeeb05] > /lib64/libgobject-2.0.so.0(g_object_new+0xc1) [0x7f90fceef6b1] > mate-power-manager(+0x15e26) [0x55bef533fe26] > mate-power-manager(+0xb20a) [0x55bef533520a] > /lib64/libc.so.6(__libc_start_main+0xf3) [0x7f90fcaa01a3] > mate-power-manager(+0xb58e) [0x55bef533558e] > Traceback (most recent call last): > File "/usr/bin/seapplet", line 34, in <module> > from setroubleshoot.config import get_config > ModuleNotFoundError: No module named 'setroubleshoot.config' > > ** (mate-screensaver:141959): WARNING **: 15:26:39.843: AT-SPI: Could not > obtain desktop path or name > > > ** (mate-screensaver:141959): WARNING **: 15:26:39.844: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (mate-screensaver:141959): WARNING **: 15:26:39.844: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-screensaver:141959): WARNING **: 15:26:39.845: atk-bridge: > get_device_events_reply: unknown signature > > ** (nm-applet:141855): WARNING **: 15:26:39.972: AT-SPI: Could not obtain > desktop path or name > > > ** (nm-applet:141855): WARNING **: 15:26:39.974: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (nm-applet:141855): WARNING **: 15:26:39.974: atk-bridge: > get_device_events_reply: unknown signature > > ** (nm-applet:141855): WARNING **: 15:26:39.974: atk-bridge: > get_device_events_reply: unknown signature > > ** (evolution-alarm-notify:141952): WARNING **: 15:26:40.409: AT-SPI: > Could not obtain desktop path or name > > > ** (evolution-alarm-notify:141952): WARNING **: 15:26:40.411: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (evolution-alarm-notify:141952): WARNING **: 15:26:40.411: atk-bridge: > get_device_events_reply: unknown signature > > ** (evolution-alarm-notify:141952): WARNING **: 15:26:40.411: atk-bridge: > get_device_events_reply: unknown signature > Initializing caja-open-terminal extension > Initializing caja-xattr-tags extension > Initializing caja-image-converter extension > > ** (emacs:142374): WARNING **: 15:26:54.745: AT-SPI: Could not obtain > desktop path or name > > > ** (emacs:142374): WARNING **: 15:26:54.755: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (emacs:142374): WARNING **: 15:26:54.755: atk-bridge: > get_device_events_reply: unknown signature > > ** (emacs:142374): WARNING **: 15:26:54.755: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-terminal:145225): WARNING **: 15:36:58.397: AT-SPI: Could not > obtain desktop path or name > > > ** (mate-terminal:145225): WARNING **: 15:36:58.540: atk-bridge: > GetRegisteredEvents returned message with unknown signature > > ** (mate-terminal:145225): WARNING **: 15:36:58.540: atk-bridge: > get_device_events_reply: unknown signature > > ** (mate-terminal:145225): WARNING **: 15:36:58.540: atk-bridge: > get_device_events_reply: unknown signature > > (mate-screensaver:141959): GLib-CRITICAL **: 16:29:53.048: Source ID 57 > was not found when attempting to remove it > > (mate-screensaver:141959): GLib-CRITICAL **: 17:38:18.661: Source ID 101 > was not found when attempting to remove it > > (mate-screensaver:141959): GLib-CRITICAL **: 17:46:13.071: Source ID 161 > was not found when attempting to remove it > > (mate-screensaver:141959): GLib-CRITICAL **: 19:07:25.615: Source ID 213 > was not found when attempting to remove it > ICE default IO error handler doing an exit(), pid = xxxxxx, errno = 32 > > (mate-settings-daemon:141818): GLib-GIO-WARNING **: 20:52:35.368: Error > releasing name org.mate.SettingsDaemon.Rfkill: The connection is closed > [1590348395,000,xklavier.c:xkl_engine_start_listen/] The backend does > not require manual layout management - but it is provided by the application >

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