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[Bug 1501580] Re: Workaround for dw_dmac causing random hang when booting


At the moment I'll say no.

This issue doesn't happen anymore after firmware update on HP X360. I've
asked FE in Taipei to help downgrading the firmware last week,  so I can
verify some patches for dw_dmac, and hopefully can also fix the issue in

If there are fixes for this issue, I'll open another bug to send SRU,
and revert this workaround.

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  Workaround for dw_dmac causing random hang  when booting

Status in HWE Next:
Status in linux package in Ubuntu:
Status in linux source package in Vivid:
  Fix Released

Bug description:
  On HP X360, we've found dw_dmac hangs system when booting with very
  high fail rate (~80%). System can not turn power off when shutting
  down either if dw_dmac is loaded.

  The maintainer from Intel is proposing a patch to fix this issue, but
  won't be available until 4.3 or 4.4, and there're users already hit
  this problem[1], so we proposed a temporarily workaround to skip
  probing in dw_dmac by returning -ENODEV directly if DMI_PRODUCT_NAME
  matches HP X360 before the fix is ready.

  [1]: https://bugzilla.kernel.org/show_bug.cgi?id=101271

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