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polv

Member

Registered: 2021-04-27

Posts: 42

[Solved]Rosegarden no sound, and lack of low-latency kernel

How do I make sound in Rosegarden example?

Currently, I run Timidity++ daemon on GNOME40.

timidity -iA

And Cadence with jack2 server, but it report Kernel warning, but I cannot read the warning.

Rosegarden also generates a warning

Performance Problems Detected

System timer

Rosefarden was unable to find a high-resolution timing source for MIDI performance.

You may be able to solve this problem by loading the RTC timer kernel module. To do this, try running sudo modprobe snd-rtctimer in a terminal window and then restarting Rosegarden.

Alternatively, check whether your Linux distributor provides a multimedia-optimized kernel. See Rosegarden website for notes about this.

I couldn't make it.

➜  ~ sudo modprobe snd-rtctimer
modprobe: FATAL: Module snd-rtctimer not found in directory /lib/modules/5.12.3-arch1-1
➜  ~ yay lowlatency            
2 aur/snd-usb-audio-lowlatency-dkms 5.2.10-1 (+0 0.00) 
    snd-usb-audio kernel module modified for low latency
1 aur/kwin-lowlatency 5.20.5-1 (+51 0.36) 
    the compositor, with added stutter/latency reductions
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 2
:: Checking for conflicts...
:: Checking for inner conflicts...
[Repo:1]  dkms-2.8.4-1
[Aur:1]  snd-usb-audio-lowlatency-dkms-5.2.10-1

  1 snd-usb-audio-lowlatency-dkms            (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 
:: PKGBUILD up to date, Skipping (1/1): snd-usb-audio-lowlatency-dkms
  1 snd-usb-audio-lowlatency-dkms            (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 
:: (1/1) Parsing SRCINFO: snd-usb-audio-lowlatency-dkms

:: PGP keys need importing:
 -> ABAF11C65A2970B130ABE3C479BE3E4300411886, required by: snd-usb-audio-lowlatency-dkms
 -> 647F28654894E3BD457199BE38DBBDC86092693E, required by: snd-usb-audio-lowlatency-dkms
==> Import? [Y/n] y
:: Importing keys with gpg...
gpg: keyserver receive failed: No name
problem importing keys

For the instruction here, I had to tweak. It's not hd:0, but hd:1.

I believe the low latency kernel is linux-rt (AUR), but I didn't install in fear of breaking VirtualBox.

Anyways, Cadence did start successfully, but still no sound in Rosegarden.

I got it to work in Ubuntu Studio, though. - https://askubuntu.com/questions/620375/ … rosegarden

Last edited by polv (2021-05-17 06:16:17)

polv

Member

Registered: 2021-04-27

Posts: 42

Re: [Solved]Rosegarden no sound, and lack of low-latency kernel

Now, uninstalled Timidity.

Cadence works by ALSA => PulseAudio => JACK (Plugin); and output is hw:0

QSynth also need to be run before Rosegarden, and Soundfonts set.

The key to make it work here, is LOTS OF REBOOTS.