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


This bug also appears on Acer Aspire E15 Laptops (E5-511-P7AT) and
(E5-511-P01P) on 14.04.3 Trusty with kernel 3.19.0-28.

If  dw_dmac and dw_dmac_core are not blacklisted, everytime on Shut Down
or Reboot comes a black screen and the fan starts spinning like crazy
every +-20 seconds, but the machine doesn't shut down or reboot.

I hope this issue will be fixed for the next LTS 16.04 ?

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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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