Hi,

>> I'm using the latest fosphor from git
>> (7b6b9961bc2d9b84daeb42a5c8f8aeba293d207c) and am seeing two weird (and I
>> believe related) issues. Firstly, I see the following error:
>>
>> [+] Selected device: TITAN X (Pascal)
>> [!] CL Error (-30, /home/user/gr-fosphor/lib/fosphor/cl.c:409): Unable to
>> queue clear of spectrum buffer
>
> That's really weird indeed. Although I've seen it before. Can't
> remember exactly what it was though ...

Actually the reason I'm not seeing it anymore on my setup is because I
don't have any machine with CL/GL sharing working any more ... I
changed laptop since and I can't get CL/GL sharing working with
optirun and recent nvidia drivers ...

One thing I would point out though is that if you have CL/GL sharing
working, you can pretty much comment the entire call to
cl_queue_clear_buffers because the GL side of things will clear the
buffers already and they are the same. The independent clearing of the
CL buffers only matter if they're different.