aha. I was simply (mistakenly) under the impression that one had to have super user priv to get the rt priority. I didn't know that running programs as root was so verboten.

I'm not getting dropouts, I simply wanted to have all the goodies if need be.

On 1/9/2018 9:49 AM, IOhannes m zmoelnig wrote:
On 2018-01-09 06:37, David Medine wrote:

This may have already been addressed and in my tendency to ignore pd
list traffic I missed the explanation, but here is what is going on.

I am running a fairly fresh install of Fedora 26. I downloaded the
source to Pd, installed alsa-lib-devel and tk (for wish), then built pd
using makefile.gnu. 

i'm not sure whether makefile.gnu is actually still used by anybody
(including miller). the suggested way is to use autotools.
$ ./autgen.sh && ./configure && make


Everything works when I start pd without super user
privileges, except priority 92 scheduling is denied me. 

add your user to the "audio" group and add the following to a file like
/etc/security/limits.d/audio.conf


@audio   -  rtprio     95
@audio   -  memlock    unlimited



When I start pd
using sudo, 

oh my, thou shalt never run random applications as root.
moreso, thou shalt not run GUI applications as root.

btw, why do you think that you *must* have realtime priorities? do
youget dropouts when running without?


pd doesn't start and I get the following errors on the
command prompt:


sudo ./pd

No protocol specified
No protocol specified
application-specific initialization failed: couldn't connect to display
":0.0"

These messages are not particularly helpful for me. Anybody know what is
wrong?

Pd you cannot connect to the X server (the display server).

does it work for other applications?
the standard test used to be xclock (`sudo xclock`), but i'm not sure
whether it is installed on your system.

searching the web, i found a few suggestions how to solve the problem
(not fedora specific):

https://askubuntu.com/questions/175611/
https://forums.opensuse.org/showthread.php/405624-sudo-doesnt-open-X-programs

but to re-iterate: you should never run Pd as root. instead, allow your
user to request realtime priviliges.

fgbmadr
IOhannes



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