[Bug 38497] Il-2 Sturmovik 1946: Engine sound plays from only one speaker

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38497

Janek <fremenzone at poczta.onet.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
    Regression SHA1|                            |3ba100d81c8c2de783f0e4b57d7
                   |                            |e190ca8ec47ea

--- Comment #8 from Janek <fremenzone at poczta.onet.pl> ---
Andrew,

first to answer your question, no I don't use PulseAudio. Just ALSA.

I spent some time yesterday with git bisect to locate the faulty commit. It was
tedious but successful. The problems began in:

commit 3ba100d81c8c2de783f0e4b57d7e190ca8ec47ea
Author: Mark Harmstone <hellas at burntcomma.com>
Date:   Tue Jan 6 19:27:10 2015 +0000

    dsound: Support quadraphonic sound.

With that commit I can still hear engine sound from both speakers when facing
forward, however one speaker is slightly louder than the other. This can be
heard especially when changing facing from left to right or right to left when
there is a noticeable jump in volume level between both stereo channel. It's
not a big jump but it is noticeable. When I turn my head backwards one channel
goes mute (this was present in wine 1.4 and fixed somewhere along the way - see
below). The problem gets worse with the next commit:

commit 77b2ab21f45bc6773f539f2ae04edbf9cf09ac48
Author: Mark Harmstone <hellas at burntcomma.com>
Date:   Tue Jan 6 19:27:21 2015 +0000

    dsound: Support 5.1 sound.

This introduces the originally reported problem: engine sound can be heard from
only one speaker.

Note also that on my machine I was able to obseve several other issues with
sound:

  * looking backwards (ie. more than 90 degrees left or right from the forward
direction) makes one of the channels silent (left when looking left, right when
looking right). This is present in wine-1.4. This problem seems to have been
solved in later versions and then reintroduced in
3ba100d81c8c2de783f0e4b57d7e190ca8ec47ea
  * clicking on menu buttons causes the click sound to be played twice. Again,
present in wine 1.4, gone in newer versions.
  * when looking backwards approx. 110 degrees one of the channels turns mute.
Sound can be heard again from that channel when turning more than 110 degrees.
In other words there is a small mute area in each direction when looking
slightly backwards. Present in the commit just before
3ba100d81c8c2de783f0e4b57d7e190ca8ec47ea (subsequent commits make the whole
channel go mute so there is no chance to observe this).
  * when playing the click sounds in the menu first sound played after
launching the game is too quite. All subsequent click sounds have correct,
higher volume. Present in all versions of wine.

For now I only want to focus on the originally reported bug. Once it is fixed
and other bugs remain I will report them separately.

I'm attaching debug logs as you requested. These were generated with wine built
from commit abd673bde93b76a361ddf7342c538c2dd99af2bd. To create these I
launched the game, went into Quick Mission Builder, clicked "Fly" and once the
game loaded I looked slightly left, slightly right, then quit the mission and
the game.

My machine uses 2.6.37 kernel. That's quite old but I realized I can probably
upgrade it to 3.0 from my distribution's repositories. Maybe that will solve
the problem but in that case I will not be able to provide any further
feedback. So, should I upgrade the kernel to see if the problem disappears?

I hope all of this helps. If I can do anything else to assist please let me
know.

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