[X2Go-User] Fedora 36 and glx fails with GLXUnsupportedPrivateRequest

[Ulrich Sibiller]

If I get that right GLX offers the X_GLXVendorPrivateWithReply
request. This request knows 4 subcommands in NX:

__GLXdispatchVendorPrivProcPtr
__glXVendorPrivTable_EXT[__GLX_MAX_VENDPRIV_OPCODE_EXT -
__GLX_MIN_VENDPRIV_OPCODE_EXT + 1] = {
       __glXDisp_AreTexturesResidentEXT, /* 11 */
       __glXDisp_DeleteTextures, /* 12 */
       __glXDisp_GenTexturesEXT, /* 13 */
       __glXDisp_IsTextureEXT, /* 14 */

So chances are that glxinfo is using another one. So probably our Mesa
version 6.4.2 does not come with this/those additional subcommands.

I am wondering if we can tweak glxinfo to work nevertheless. Can you
please try if LIBL_DEBUG=verbose glxinfo shows more information? Can
you check the environment variables mentioned here:
https://dri.freedesktop.org/wiki/TestingAndDebugging/? Does it make a
difference if you call glxinfo with -i?

Uli


On Sun, Jun 12, 2022 at 1:01 AM sairuk <sairuk at gmail.com> wrote:
>
> Thanks Neal, this is what I ended up doing as well for Zoom.
>
> The Zoom issue led me to note the difference in behaviour after it started crashing, I want to be careful not to detract from the actual glx issue even if it turns out to be mesa related.
>
> Unfortunately no movement on the bug Norman raised yet
>
> sai
>
> On Sun, Jun 12, 2022 at 12:28 AM Neal Becker <ndbecker2 at gmail.com> wrote:
>>
>> sairuk wrote:
>>
>> > Maybe they did, couldn't say. my use case probably won't be a popular one
>> > but i'll run it through it anyway. My setup might not even be optimal so I
>> > am happy to consider advice.
>> >
>> > This was a finding while I was investigating why Zoom started crashing
>> > after the whiteboard update (only if the whiteboard was open, and it was
>> > only for me). I've been using Zoom within x2go XFCE sessions since 2020
>> > without issue, (recommended or not) it works fine for daily use imo. I
>> > could rollback Zoom to 5.9.x series and it was/is fine. Unfortunately due
>> > to a vuln in the xmpp chat protocol implementation of Zoom min versions
>> > needed to be enforced at 5.10.x series which has the new whiteboard
>> > implementation.
>> >
>> > Additional to updating Zoom I'd inplace upgraded the x2go endpoint OS from
>> > 20.04 (x2go glx working, mesa 21) to 22.04 (x2go glx broken, mesa 22)
>> > while on Zoom 5.9.x series client and only noticed some slight performance
>> > degradation in general session use but hadn't bothered to investigate it,
>> > I expect (now) it is related to the lack of glx.
>> >
>> > Zoom will not start without the glx extension, and using
>> > LIBGL_INDIRECT_ALWAYS is problematic (slow) as were some other envars I
>> > was testing which broke a lot of additional stuff. I don't have my notes
>> > with me now though.
>> >
>> >
>> If you just want to use zoom then use their web app instead of the native
>> zoom app.  I always do this with zoom, teams, etc. because the options for
>> sharing are better in chrome than the native apps.
>>
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