LV2 plugin GUI won't instantiate

[AdamCWB]

I’m new to Linux & to Ardour. I’m using Ardour 4.7 on Fedora 23 with a RT kernel from Planet CCRMA

I’ve installed LV2 and some plugins - notably EQ10Q. I can select them from the mixer strip and they show up OK there. But no controls show up & I get the message:

[ERROR]: failed to instantiate LV2 GUI

I have no idea why, and can’t find any help via Google. Any help would be very gratefully received.

[mhartzel (Mikael Hartzell)]

Which gcc was Ardour 5.12 64 bit Linux built with ? I’m having this exact problem on Manjaro with EQ10Q built with the default gcc 7.2.0.

[mhartzel (Mikael Hartzell)]

Ok, found a workaround. The eq10q developer is aware of the problem and offers his own binary installer that uses Ardour compatible precompiled libraries (http://eq10q.sourceforge.net/?page_id=16).

• First check your gcc version: gcc --version
• wget https://sourceforge.net/projects/eq10q/files/eq10q_2.2_installer.run/download -O eq10q_installer.sh
• chmod 755 eq10q_installer.sh
• sudo eq10q_installer.sh (answer the question about gcc4 or gcc5 as: gcc5
• mv /usr/local/lib/lv2/sapistaEQv2.lv2 /usr/lib/lv2/

Done and EQ10Q gui works again

[mhartzel (Mikael Hartzell)]

Saved too fast, here is the cleaned up procedure:

• wget https://sourceforge.net/projects/eq10q/files/eq10q_2.2_installer.run/download -O eq10q_installer.sh
• chmod 755 eq10q_installer.sh
• sudo ./eq10q_installer.sh (if the installer asks about gcc version answer: gcc5
• mv /usr/local/lib/lv2/sapistaEQv2.lv2 /usr/lib/lv2/

[x42 (Robin Gareus)]

Check Menu > Help > About > Config and see if “LV2 UI embedding: True”, if so, the most likely cause for this is a mismatch gcc4/gcc5 (ardour was compiled with one, eq10q with the other).

[Fingal (Fingalplumpton)]

Thank you so much @mhartzel! Worked for me on Ardour 5.12 on Linux Mint 18.2.