nheko and quaternion: completely black chat area

nheko and quaternion: completely black chat area

[Giovanni Biscuolo]

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Hello Guix users,

I'm running Guix on Debian 10 and I'm experiencing a strange problem
both with nheko and quaternion, both matrix chat protocol clients and
both qt5 GUI based. 

I've installed both of them via manifest from a very recent commit I've
pulled today:

--8<---------------cut here---------------start------------->8---

Generation 122  lug 08 2021 13:31:51    (current)
  guix 94f772d
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 94f772dad8cb1064d0e8cf11285ad9963ba00224

--8<---------------cut here---------------end--------------->8---

The apps are running fine, including authentication and send messages
/but/ the chat area [1] is completely black and I cannot read anything
in it.

The strange thing is that on my laptop, configured (almost) the same and
also with Guix on top of Debian 10 both applications are running fine, I
mean the message chat box is readeable.

I've also tried to compare the nheko /proc/<pid>/environ on the two
hosts but AFAIU there are no meaningful differences.

I've also installed the nheko deb package via apt and with that I do not
have the "black chat area" problem, so it seems related to Guix and to
the environment... but I'm not qt5 expert so I'm just trying to
guess... with no success.

Any hint please?

Thanks! Gio'


[1] the one with the messages list you can see in this upstream
screenshot: https://nheko-reborn.github.io/images/screenshots/chat-resized.png

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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LTSP related Re: nheko and quaternion: completely black chat area

[Giovanni Biscuolo]

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Giovanni Biscuolo <g@xelera.eu> writes:

[...]

> The apps are running fine, including authentication and send messages
> /but/ the chat area [1] is completely black and I cannot read anything
> in it.
>
> The strange thing is that on my laptop, configured (almost) the same and
> also with Guix on top of Debian 10 both applications are running fine, I
> mean the message chat box is readeable.

One more info to add: my desktop is a LTSP server (in a LXC container)
and I connect to it with a thin client, it's working well since many
years.

There's another strange thing: if I connect from my laptop to my desktop
with ssh (and X11 forwarding) I can run both nheko and quaternion
without problems, I mean: the chat area is NOT black.

So it seems to be related to my LTSP session AND to Something™ my
(Guix?) environment... but can't figure out what.

...still investigating...

[...]

Happy hacking! Gio'

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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SOLVED: Re: nheko and quaternion: completely black chat area

[Giovanni Biscuolo]

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Hello Guix,

Giovanni Biscuolo <g@xelera.eu> writes:

[...]

> So it seems to be related to my LTSP session AND to Something™ my
> (Guix?) environment... but can't figure out what.

Since my LTSP terminal is not 3D capable I have to enable the Qt Quick
2D Renderer [1] by setting this env variable in my profile:

--8<---------------cut here---------------start------------->8---

export QMLSCENE_DEVICE=softwarecontext

--8<---------------cut here---------------end--------------->8---

This way I'm now able to use nheko (and quaternion... and other Qt Quick
based apps I guess) also on my 2D LTSP terminal.

Happy hacking! Gio'


[1] https://doc.qt.io/QtQuick2DRenderer/


-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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