• Hui Wang's avatar
    ALSA: usb-audio: set the interface format after resume on Dell WD19 · 92adc96f
    Hui Wang authored
    Recently we found the headset-mic on the Dell Dock WD19 doesn't work
    anymore after s3 (s2i or deep), this problem could be workarounded by
    closing (pcm_close) the app and then reopening (pcm_open) the app, so
    this bug is not easy to be detected by users.
    
    When problem happens, retire_capture_urb() could still be called
    periodically, but the size of captured data is always 0, it could be
    a firmware bug on the dock. Anyway I found after resuming, the
    snd_usb_pcm_prepare() will be called, and if we forcibly run
    set_format() to set the interface and its endpoint, the capture
    size will be normal again. This problem and workaound also apply to
    playback.
    
    To fix it in the kernel, add a quirk to let set_format() run
    forcibly once after resume.
    Signed-off-by: default avatarHui Wang <hui.wang@canonical.com>
    Cc: <stable@vger.kernel.org>
    Link: https://lore.kernel.org/r/20191218132650.6303-1-hui.wang@canonical.comSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    92adc96f
usbaudio.h 3.37 KB