[winswitch] Xpra on ubuntu 18.04 unity

[Iwan Vosloo]

Thanks Antoine,

On 05/10/2018 18:54, Antoine Martin via shifter-users wrote:
> On 05/10/2018 14:00, Iwan Vosloo via shifter-users wrote:
>> When run from a normal, "Ubuntu" session (meaning the new Gnome shipped
>> with Ubuntu 18.04), all is well.
>>
>> However, if we log into a unity session (which is what we'd like to do),
>> xpra cannot attach,  giving:
>>
>> 2018-10-05 08:35:15,622 Xpra gtk2 client version 2.3.4-r20509 64-bit
>> 2018-10-05 08:35:15,623  running on Linux Ubuntu 18.04 bionic
>> 2018-10-05 08:35:17,212 GStreamer version 1.14.1 for Python 2.7.15 64-bit
>> 2018-10-05 08:35:17,376 No OpenGL_accelerate module loaded: No module
>> named OpenGL_accelerate
>> /usr/lib/python2.7/dist-packages/xpra/client/gl/gtk_base/gtkgl_check.py:152:
>> Warning: cannot register existing type 'GdkScreen'
>>    glarea.realize()
>> /usr/lib/python2.7/dist-packages/xpra/client/gl/gtk_base/gtkgl_check.py:152:
>> Warning: g_once_init_leave: assertion 'result != 0' failed
>>    glarea.realize()
>> /usr/lib/python2.7/dist-packages/xpra/client/gl/gtk_base/gtkgl_check.py:152:
>> GtkWarning: gdk_screen_is_composited: assertion 'GDK_IS_SCREEN (screen)'
>> failed
>>    glarea.realize()
>> Segmentation fault (core dumped)
> That's an OpenGL crash.
> We have sanity checks to verify that the OpenGL drivers work properly
> before we enable them, but it is those checks that are causing the crash
> here. If the drivers can't create a simple test window, something is
> fundamentally wrong.
> 
> Looks like the opengl bindings don't run properly under Unity.
> This would be a bug for Unity or gtkgl.
> 
> 
> You may have more luck with the alternative opengl backend:
> xpra attach --opengl=native
> 
> The only thing we could do better here would be to proactively disable
> OpenGL under Unity.

I realise something besides xpra must be causing the issue - something 
that changed between ubuntu 16.04 (where Unity works fine) and 18.04. 
Not sure how to get more info to poinpoint the issue though.

> Let us know how you get on so that I can blacklist Unity if necessary.

with --opengl=native things still dont work and I get output:

2018-10-07 14:31:18,390 Xpra gtk2 client version 2.3.4-r20509 64-bit
2018-10-07 14:31:18,391  running on Linux Ubuntu 18.04 bionic
2018-10-07 14:31:20,113 GStreamer version 1.14.1 for Python 2.7.15 64-bit
2018-10-07 14:31:20,275 No OpenGL_accelerate module loaded: No module 
named OpenGL_accelerate
/usr/lib/python2.7/dist-packages/xpra/client/gtk_base/gtk_client_base.py:1020: 
Warning: cannot register existing type 'GdkScreen'
   window.realize()
/usr/lib/python2.7/dist-packages/xpra/client/gtk_base/gtk_client_base.py:1020: 
Warning: g_once_init_leave: assertion 'result != 0' failed
   window.realize()
/usr/lib/python2.7/dist-packages/xpra/client/gtk_base/gtk_client_base.py:1020: 
GtkWarning: gdk_screen_is_composited: assertion 'GDK_IS_SCREEN (screen)' 
failed
   window.realize()
2018-10-07 14:31:20,529 OpenGL enabled with Mesa DRI Intel(R) HD 
Graphics 520 (Skylake GT2)

However that process seems to hang and never reports being attached. I 
have to kill -9 to get rid of it.

> It wouldn't hurt to have the output of the command:
> xpra opengl

No OpenGL_accelerate module loaded: No module named OpenGL_accelerate
GLU.extensions=GLU_EXT_nurbs_tessellator GLU_EXT_object_space_tess
GLU.version=1.3
accum-blue-size=0
accum-green-size=0
accum-red-size=0
alpha-size=0
aux-buffers=0
blue-size=8
depth=24
depth-size=0
display_mode=DOUBLE
double-buffered=True
gdkgl={'version': (1, 4)}
gdkglext={'version': (1, 2, 0)}
green-size=8
gtkglext={'version': (1, 2, 0)}
has-depth-buffer=False
has-stencil-buffer=False
has_alpha=False
max-viewport-dims=(32768, 32768)
opengl=3.0
pygdkglext={'version': (1, 1, 0)}
pyopengl=3.1.1a1
red-size=8
renderer=Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)
rgba=True
safe=True
sample-buffers=0
samples=0
shading-language-version=1.30
stencil-size=0
stereo=False
texture-size-limit=16384
transparency=True
vendor=Intel Open Source Technology Center
zerocopy=False


> 
>> If we run it under unity with:
>>    xpra attach --sharing=yes --opengl=no ssh:vagrant at 10.0.3.140:100
>>
>> ...then it attaches fine (also according to the server log file), but
>> running a program on :100 does not open a window on the attached client.
> This looks like a separate issue.
> It's very difficult to tell you anything useful as there just isn't
> enough information there. FWIW, I've just tried it and encountered no
> problems.
> Try filing a ticket and make sure to include "xpra info".
> 

Ok, thanks I did so and included output of xpra opengl and xpra info.


Regards
Iwan

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