Comments (9)
I have a similar-appearing problem. Black screen, acts like a transparent window into things happening behind it. No graphics, no white screen, no visualisation at all if I open a gcode file. Just a transparent window into what's behind it.
I just updated to Ubuntu 24.04 and re-installed Candle. This was working for years on this machine, with Ubuntu 18.04. I have candle working on several other machines in our office (windows and ubuntu).
Here is the current graphics card and driver info:
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G1 (Ice Lake) (rev 07)
Subsystem: Hewlett-Packard Company Iris Plus Graphics G1 (Ice Lake)
Kernel driver in use: i915
Kernel modules: i915
First I tried installing with Qt, but that produced this problem. Then I tried installing with cmake. No difference.
It will connect to our little CNC engraving machine, but that seems irrelevant, if we can't even open a gcode file and review it.
I'd appreciate your thoughts and ideas. The OS upgrade has turned into a massive downgrade for now.
Thanks, son1csun
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@son1csun, when you run Candle from terminal, is there anything output into terminal?
Try to reset all setting to default: Service->Settings->"Set to default".
I've checked pre-built Candle-1.1.9-Linux-x86_64.AppImage for Ubuntu 24.04 (in VMware) - it works for me.
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@mar0x Here's a screenshot of Candle run from the terminal. The desktop background is actually shown in the Candle window, but somehow it is displayed as solid black in this screenshot.
When I start from the terminal, this message is shown:
QSocketNotifier: Can only be used with threads started with QThread
locale: "en"
I'm not sure how to fix this. I have a german keyboard, but my computer is set to english language.
Perhaps I should just use an earlier version of Candle?
Thanks!
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The output
locale: "en"
is harmless and only states the translation language used (see main.cpp:50) .
QSocketNotifier
message is more interesting, but seems unrelated to your graphics issue.
In my case there also message shader program created
during GL widget initialization.
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@mar0x Thanks. The complete output in the terminal after start is:
QSocketNotifier: Can only be used with threads started with QThread
locale: "en"
shader program created
preparing vectors GcodeDrawer(0x5fa61e1aec20)
lines count 0
preparing vectors GcodeDrawer(0x5fa61e19b9e0)
lines count 0
Not sure if this is helpful. Tried installing 1.1.7 and am now dealing with a different error there:
./Candle: error while loading shared libraries: libgobject-2.0.so.0: cannot open shared object file: No such file or directory
This seems like a common linux problem that has a solution somewhere online...
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Have you tried Candle-1.1.9-Linux-x86_64.AppImage (download, make it executable and run) ?
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@mar0x Just downloaded, built with Qt, and ran Candle-grbl_1_0 from terminal. Same visualisation issue:
Text that appears in the terminal:
QSocketNotifier: Can only be used with threads started with QThread
locale: "en"
style "Windows"
style "Fusion"
shader program created
preparing vectors GcodeDrawer(0x584dd5960dc0)
lines count 0
preparing vectors GcodeDrawer(0x584dd59cfcd0)
lines count 0
from candle.
Have you tried Candle-1.1.9-Linux-x86_64.AppImage (download, make it executable and run) ?
@mar0x That + Service > Settings > Set to defaults did it! Whew... Now to delete all the non-working junk...
Muchas Gracias! Grazie Mille! Danke sehr! etc.
Now back to work
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@son1csun, I'm glad it works for you. Most likely there was an issue with build environment in your new Ubuntu 24.04 (something missing).
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