On Fedora 36 we have:

libglvnd-1.4.0-2.fc36.x86_64

libglvnd-glx-1.4.0-2.fc36.x86_64

On Fedora 35:

libglvnd-1.3.4-2.fc35.x86_64

libglvnd-glx-1.3.4-2.fc35.x86_64

I managed to download the libglvnd* packages for F35, and on an F36 system, I downgraded:

dnf downgrade ./libglvnd* ./glx-utils*

and rebooted.

So now on my F36 system I have:

libglvnd-1.3.4-2.fc35.x86_64
libglvnd-glx-1.3.4-2.fc35.x86_64

(I've trimmed the package lists in the above, there are more libglvnd* installed/downgraded).

And the same behaviour occurs:

$ glxinfo
name of display: :50.0
X Error of failed request: GLXUnsupportedPrivateRequest
Major opcode of failed request: 143 (GLX)
Minor opcode of failed request: 17 (X_GLXVendorPrivateWithReply)
Serial number of failed request: 27
Current serial number in output stream: 27

So this suggests it's not the upgrade from 1.3 to 1.4 of libglvnd-glx ???

glxinfo is part of the glx-utils package, which I also downgraded. But they have the same version number:

glx-utils-8.4.0-12.20210504git0f9e7d9.fc35.x86_64

glx-utils-8.4.0-13.20210504git0f9e7d9.fc36.x86_64

So, I'm not sure what to look at next.

On Fri, 3 Jun 2022 at 17:26, Ulrich Sibiller <uli42@gmx.de> wrote:

The version of x2goserver and x2goclient is irrelevant here. The GLX
code is in nx-libs (nxagent/x2goagent). However, nothing has changed
there in years, so I suggest to downgrade glxinfo and retry. Let me
know the result.

Uli

On Fri, Jun 3, 2022 at 1:51 AM Norman Gaywood <ngaywood@une.edu.au> wrote:
>
> In Fedora 35 glxinfo (and glxgears) worked fine with x2goserver-4.1.0.3-17.fc35.x86_64
>
> After updating to Fedora 36, x2goserver-4.1.0.3-17.fc36.x86_64, glxinfo no longer works.
> $ glxinfo
> name of display: :50.0
> X Error of failed request: GLXUnsupportedPrivateRequest
> Major opcode of failed request: 143 (GLX)
> Minor opcode of failed request: 17 (X_GLXVendorPrivateWithReply)
> Serial number of failed request: 27
> Current serial number in output stream: 27
>
> Linux x2goclient X2Go Client v. 4.1.2.2 (Qt - 5.15.3)
>
> Is there any way to make this work? Not sure what programs actually use it.
> Thankfully matlab still seems to work.
> --
> Norman Gaywood, Computer Systems Officer
> School of Science and Technology
> University of New England
> Armidale NSW 2351, Australia
>
> ngaywood@une.edu.au http://turing.une.edu.au/~ngaywood
> Phone: +61 (0)2 6773 2412 Mobile: +61 (0)4 7862 0062
>
> Please avoid sending me Word or Power Point attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
> _______________________________________________
> x2go-user mailing list
> x2go-user@lists.x2go.org
> https://lists.x2go.org/listinfo/x2go-user

Norman Gaywood, Computer Systems Officer

School of Science and Technology
University of New England

Armidale NSW 2351, Australia

ngaywood@une.edu.au http://turing.une.edu.au/~ngaywood

Phone: +61 (0)2 6773 2412 Mobile: +61 (0)4 7862 0062

Please avoid sending me Word or Power Point attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html