Illegal instruction on linux build 1.4

Hello, I tried updating to the new 1.4 version of synthv to try out the new voices and I got an illegal instruction error while trying to run the binary. I went back just to make sure and 1.3 works perfectly well.
Here’s what I got form gdb:

(gdb) run
Starting program: /home/hanabi/dl/Synthesizer V Studio Basic/synthv-studio
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/".
[New Thread 0x7ffff68ab640 (LWP 31871)]
[New Thread 0x7ffff60aa640 (LWP 31872)]
[New Thread 0x7ffff5860640 (LWP 31873)]
[New Thread 0x7ffff4ff7640 (LWP 31874)]
[New Thread 0x7fffe7fff640 (LWP 31875)]

Thread 1 "synthv-studio" received signal SIGILL, Illegal instruction.
0x00000001009b999e in ?? ()

After running layout asm I found that the instruction is
0x1009b999e shlx %eax, %ecx, %eax
shlx is a BMI instruction introduced with Haswell(according to wikipedia).
Could it be possible to make a build of synthv-studio with for example -march=x86-64-v2 to accommodate people with older CPUs, please?

Thank you very much in advance!

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I have this problem too. I guess my laptop CPU Intel® Core™ i7 CPU Q 720 is too old.
Hopefully they can release a version for older CPUs.
Maybe the new AI code needs these instructions to perform well?
Fingers crossed, I hope Dreamtronics can help.

1 Like

Do you mean the i7-720QM? That’s Nehelem so it also should be supported by x86-64-v2. Can you type this in your terminal just to make sure?
/usr/lib/ --help | grep supported

Maybe the new AI code needs these instructions to perform well?

Idk… 1.3 was blazing fast for me so unless the AI code slowed things down immensely, I don’t see how that would happen :confused:
If they want to stick with this build as official for now I at least wish they’d also release some other build for older CPUs stating that it will perform worse

Fingers crossed, I hope Dreamtronics can help.


I gave up waiting for a response from Dreamtonics and bought new laptop with AMD 5900HX processor. Of course it works.


it appears that the patched 1.4.1 and the newest 1.5 version both support my current CPU.
Big thanks to everyone involved in Dreamtonics!