x2go-user June 2020

x2go-user@lists.x2go.org

15 participants
11 discussions

x2go session failure because of unknown "localhost"
by flegoff 23 Jun '20

23 Jun '20

Hello list, I have been using x2go without issues for a long time until recently. Both client and server are running on Linux machines. I can connect to the server (via an SSH proxy). I get the "New session started" notification. But the session is apparently terminated because tere is some error resoling the display server. I copy pasted the log messages in the enclosed file. I think the important part is this: Loop: WARNING! Overriding auxiliary X11 port with new value '1'. Warning: Overriding auxiliary X11 port with new value '1'. Info: Using abstract X11 socket in kernel namespace for accessing DISPLAY=:0. Error: Failed to resolve address of 'localhost'. Loop: PANIC! Unknown remote host 'localhost'. Error: Unknown remote host 'localhost'. Session: Session terminated at 'Fri Jun 19 22:50:42 2020'. As far as I remember I haven't changed client or server configuration. I did switch from using Published App sessions to Xfce session to I have installed Xfce on the server. Published App sessions do not work either now. Any idea what is going on here? Or how to debug this? Cheers, Fabrice

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keyboard config on wayland
by Neal Becker 22 Jun '20

22 Jun '20

Both client and server are Fedora (31 and 32). I'm running a kde/wayland client, with capslock mapped to ctrl. When I connect to the server (running mate) everything works fine, except I don't have capslock mapped to ctrl. Every time I connect (not every time the session starts) I have to run setxkbmap -option caps:ctrl_modifier Oh actually one thing doesn't work. Cut/paste is totally nonfunctional. -- *Those who don't understand recursion are doomed to repeat it*

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Problems using HTML5 kvm console
by Simon Beißer 20 Jun '20

20 Jun '20

Hello everyone, we use x2go in our company and it works really well. However, currently we have noticed two problems that occur in connection with an HTML5 KVM (remote console) client. Maybe one of you has an idea about these issues. 1st question When using the keyboard within the KVM console, we noticed that the arrow down key is incorrectly assigned and triggers an Enter. With the help of a keycode event tool I found that the NumpadEnter is transmitted there, see screenshot in the appendix. It seems that the wrong physical key (key code) is transmitted via x2go/nx. This has nothing directly to do with the keyboard layout used and therefore unfortunately cannot be changed within the virtual console. Is this error known? Is there a fix for it? 2nd question OpenGL/GLX is required for the KVM console. Unfortunately, only GLX1.2 is in use among the current nx-libs, which is why this does not work in Firefox. I have found only VirtualGL as workaround. Do you know other methods to make such applications running? Best regards Simon

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Minor Enhancement Request
by Matt Rhodes 19 Jun '20

19 Jun '20

Hi, Short version, we'd like the ~/.ssh/config file to be respected for X2GoClient on Windows. Use case: I've been using X2Go heavily with some colleagues on Windows 10. We also use Git quite a bit, which provides SSH via repackaged MSYS. We frequently use the config file at ~/.ssh/config in order to set up all the hosts and connections we use, as there are a lot to manage. We connect a lot to various machines, including local VMs in Hyper-V using both SSH through Git Bash, as well as with X2Go Client. Pain: The current X2Go Client makes us maintain the configurations for each connection separately from the SSH Config file we already maintain. VM images complicate things as the IPs change on us more than we'd like and exacerbate the pain as we have to make IP updates in more than one location. Any useful workaround suggestions until X2Go client can be made to honor the ~/.ssh/config file? Matt.

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OT: key modifiers
by Neal Becker 19 Jun '20

19 Jun '20

I have a nasty problem not related to x2go. My desktop is Fedora 32/KDE (pretty sure doesn't matter if wayland or x11). Sometimes I need to edit a MS office document. I've been using vmware horizon to connect to my work, and fire up powerpoint. After using this, (and after closing down horizon), I find all my modifier keys are gone, ALT, CTRL no longer do anything. I don't know how to recover without logoff/logon. As you can imagine, this is not really acceptable. Anyone know how to fix this? Thanks, Neal -- *Those who don't understand recursion are doomed to repeat it*

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Can't start a plasma session
by Mihai Dobrescu 18 Jun '20

18 Jun '20

Hello, my x2go, provided by Sabayon Linux, can't start a KDE session because there is no more startkde command, I guess now it must run startplasma-wayland or startplasma-x11. Is there a version that implements that? Which one? Regards, Mihai Sorin Dobrescu

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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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x2go-user June 2020