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    SubjectRe: [REGRESSION bisected] Sound goes too fast due to commit 7b3a177b0
    On 14/04/10 08:08, Takashi Iwai wrote:
    > At Tue, 13 Apr 2010 23:54:26 +0200,
    > Éric Piel wrote:
    >> Hello,
    >> Since 2.6.34-rc*, I have a regression on alsa which prevents the sound
    >> to be played correctly. When playing, the music goes too fast, skipping
    >> some parts. Typically, it's very easy to reproduce by doing:
    >> time mplayer -endpos 30 sound-file-which-lasts-more-than-thirty-sec.mp3
    >> If the wall clock is less than 30s, you have the bug. With my intel-hda
    >> (AD1981), it's reliably reproducible: it gives ~27s, instead of the
    >> normal ~31s.
    >> After bisection, it turns out that it is commit
    >> 7b3a177b0d4f92b3431b8dca777313a07533a710, aka "ALSA: pcm_lib: fix
    >> "something must be really wrong" condition" which caused this
    >> regression. Reverting it on top of 2.6.34-rc3+ fixes the problem.
    > What happens if you pass position_fix=1 option to snd-hda-intel?
    Oh! Very good remark...
    I've just noticed that I had an option already on the module:
    bdl_pos_adj=0. It seems it's not needed anymore to get my card working
    fine. If I remove every option (leaving bdl_pos_adj to the default value
    1), it works fine. If I put bdl_pos_adj=0 and position_fix=1, it works
    fine again.

    I don't fully grasp the meaning of bdl_pos_adj, so I don't know if it's
    a bug to not play correctly when forcing it to 0. Is it?

    I'll ask to another reporter who had the same problem if bdl_pos_adj is
    also set to 0...

    > Is it via PulseAudio or other backend?
    This happens both with pulseaudio, oss and alsa (in which case it plays
    the 30s clip in 12s).

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