Re: [Rosegarden-user] Play function doesn't work anymore

[Fernando A. Martin]

I tested kernel 4.8.8 and now it's working again.

2016-11-12 17:57 GMT-02:00 Abrolag :

> On Sat, 12 Nov 2016 19:00:13 +
> "J.P. Morris"  wrote:
>
> > On Fri, 21 Oct 2016 21:37:38 -0200
> > "Fernando A. Martin"  wrote:
> >
> > If anyone's posted an update on this, I've missed it.
> > I've upgraded the kernel to 4.8.7 and this appears to have fixed
> > the regressions.  Rosegarden is happy now.
> >
> > The changelog for 4.8.7 includes the following:
> >
> > "The recent rewrite of the sequencer time accounting using timespec64
> >  in the commit [3915bf294652: ALSA: seq_timer: use monotonic times
> >  internally] introduced a bad regression.  Namely, the time reported
> >  back doesn't increase but goes back and forth.
> >
> >   The culprit was obvious: the delta is stored to the result (cur_time =
> >   delta), instead of adding the delta (cur_time += delta)!
> >
> >   Let's fix it."
>
>
> It's almost reassuring that the 'big boys' can make such an obvious typo.
>
> I needed that :¬)
>
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>
> 
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Re: [Rosegarden-user] Play function doesn't work anymore

[Abrolag]

On Sat, 12 Nov 2016 19:00:13 +
"J.P. Morris"  wrote:

> On Fri, 21 Oct 2016 21:37:38 -0200
> "Fernando A. Martin"  wrote:
> 
> If anyone's posted an update on this, I've missed it.
> I've upgraded the kernel to 4.8.7 and this appears to have fixed
> the regressions.  Rosegarden is happy now.
> 
> The changelog for 4.8.7 includes the following:
> 
> "The recent rewrite of the sequencer time accounting using timespec64
>  in the commit [3915bf294652: ALSA: seq_timer: use monotonic times
>  internally] introduced a bad regression.  Namely, the time reported
>  back doesn't increase but goes back and forth.
> 
>   The culprit was obvious: the delta is stored to the result (cur_time =
>   delta), instead of adding the delta (cur_time += delta)!
> 
>   Let's fix it."


It's almost reassuring that the 'big boys' can make such an obvious typo.

I needed that :¬)

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Re: [Rosegarden-user] Play function doesn't work anymore

[J.P. Morris]

On Fri, 21 Oct 2016 21:37:38 -0200
"Fernando A. Martin"  wrote:

If anyone's posted an update on this, I've missed it.
I've upgraded the kernel to 4.8.7 and this appears to have fixed
the regressions.  Rosegarden is happy now.

The changelog for 4.8.7 includes the following:

"The recent rewrite of the sequencer time accounting using timespec64
 in the commit [3915bf294652: ALSA: seq_timer: use monotonic times
 internally] introduced a bad regression.  Namely, the time reported
 back doesn't increase but goes back and forth.

  The culprit was obvious: the delta is stored to the result (cur_time =
  delta), instead of adding the delta (cur_time += delta)!

  Let's fix it."


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Re: [Rosegarden-user] Play function doesn't work anymore

[Yves Guillemot]

Le samedi 22 octobre 2016, 15:25:46 Abrolag a écrit :
> I can't see it being an ALSA issue if the soundcard timer works OK.
> 
> A quick search online reveals that there have been changes in the kernel
> timers, and there may be an outstanding bug.

I said this only because I think RG is interfaced to the synth through the 
ALSA seq, but I really don't know where is the bug.

> Personally I'm sticking with 4.6.4 as this is the last one debian supplied
> with an RT alternative (and I'm too lazy to recompile it myself).

I compiled this new kernel only to reproduce the Fernando's problem.
It takes some time to compile, but only needs to type a few commands.

I usually keep the kernels supplied with my distro. They are older, but they 
do the job and are already debugged.

Yves


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Re: [Rosegarden-user] Play function doesn't work anymore

[Abrolag]

On Sat, 22 Oct 2016 15:40:07 +0200
Yves Guillemot  wrote:

> Le samedi 22 octobre 2016, 10:02:10 Fernando A. Martin a écrit :
> > I'm using rosegarden + alsa + timidity. I tried all the PCM... options and
> > the cursor moves during playback but no sound is played (except the first
> > note of the measure where the cursor was when I hit play).
> > So the PCM... options solve the issue that the cursor doesn't move during
> > playback but create another that is the issue that the cursor moves but no
> > sound is played.  
> 
> I confirm the issue with kernel 4.8.3.
> Notes are played while entered in the notation editor, but there is no more 
> sound while playing the composition.
> 
> This is noticeable using timidity, fluidsynth or even an external h/w midi 
> synth.
> 
> I presume this is coming from some change in the alsa sequencer.
> 
> Yves

I can't see it being an ALSA issue if the soundcard timer works OK.

A quick search online reveals that there have been changes in the kernel
timers, and there may be an outstanding bug.

Personally I'm sticking with 4.6.4 as this is the last one debian supplied
with an RT alternative (and I'm too lazy to recompile it myself).

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Re: [Rosegarden-user] Play function doesn't work anymore

[Yves Guillemot]

Le vendredi 21 octobre 2016, 22:09:21 Fernando A. Martin a écrit :
> Some minutes after writing this message I recalled that recently I updated
> my linux kernel to 4.8.3. Then I removed kernel 4.8.3 and went back to
> kernel 4.7.5. Now Rosegarden is able to play correctly again.
> It's nice to have things working again but it seems that something in the
> newest linux kernels are breaking the play function of rosegarden. Can
> anyone else test this?

My distro is currently only using kernel 4.4.26.
I compiled 4.8.3 from source and just boot it without modifying anything else.

I confirm that play doesn't work with timer -> "(auto)" which defaults to 
"system timer".

I tried timer -> "HR timer" which freezed the whole system.

Then timer -> "PCM playback 0-0-0" which works.


> If it's true, can developers do something to make
> rosegarden play function work with new linux kernels?

This will become necessary when this kernel version will spread.
I currently don't have any clue as up to now I never looked at the timer 
implementation.


Yves


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Re: [Rosegarden-user] Play function doesn't work anymore

[Fernando A. Martin]

I'm using rosegarden + alsa + timidity. I tried all the PCM... options and
the cursor moves during playback but no sound is played (except the first
note of the measure where the cursor was when I hit play).
So the PCM... options solve the issue that the cursor doesn't move during
playback but create another that is the issue that the cursor moves but no
sound is played.

2016-10-22 4:42 GMT-02:00 Abrolag :

> On Fri, 21 Oct 2016 22:09:21 -0200
> "Fernando A. Martin"  wrote:
>
> > Good and bad news:
> > Some minutes after writing this message I recalled that recently I
> updated
> > my linux kernel to 4.8.3. Then I removed kernel 4.8.3 and went back to
> > kernel 4.7.5. Now Rosegarden is able to play correctly again.
> > It's nice to have things working again but it seems that something in the
> > newest linux kernels are breaking the play function of rosegarden. Can
> > anyone else test this? If it's true, can developers do something to make
> > rosegarden play function work with new linux kernels?
> > Thanks.
>
> Agree with Michael. This is almost certainly the timer source. I find the
> most
> reliable (and accurate) is the soundcard one. Look for something like
> "PCM playback 0-0-0"
>
> --
> W J G
>
> 
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Re: [Rosegarden-user] Play function doesn't work anymore

[Abrolag]

On Fri, 21 Oct 2016 22:09:21 -0200
"Fernando A. Martin"  wrote:

> Good and bad news:
> Some minutes after writing this message I recalled that recently I updated
> my linux kernel to 4.8.3. Then I removed kernel 4.8.3 and went back to
> kernel 4.7.5. Now Rosegarden is able to play correctly again.
> It's nice to have things working again but it seems that something in the
> newest linux kernels are breaking the play function of rosegarden. Can
> anyone else test this? If it's true, can developers do something to make
> rosegarden play function work with new linux kernels?
> Thanks.

Agree with Michael. This is almost certainly the timer source. I find the most
reliable (and accurate) is the soundcard one. Look for something like
"PCM playback 0-0-0"

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Re: [Rosegarden-user] Play function doesn't work anymore

[Fernando A. Martin]

Good and bad news:
Some minutes after writing this message I recalled that recently I updated
my linux kernel to 4.8.3. Then I removed kernel 4.8.3 and went back to
kernel 4.7.5. Now Rosegarden is able to play correctly again.
It's nice to have things working again but it seems that something in the
newest linux kernels are breaking the play function of rosegarden. Can
anyone else test this? If it's true, can developers do something to make
rosegarden play function work with new linux kernels?
Thanks.
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Re: [Rosegarden-user] Play function doesn't work anymore

[D. Michael McIntyre]

On 10/21/2016 07:37 PM, Fernando A. Martin wrote:

> the cursor doesn't move and no sound is played.

This is usually a bad sequencer timing source.

Edit -> Preferences -> MIDI -> General -> Sequencer Timing Source

It defaults to auto, which works for most users.  If auto does not work, 
go down the list of PCM- timers until you find one that works.

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