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[Phidias <phidias.chiang@xxxxxxxxxxxxx>]

Test:
1. Remove `blacklist dw_dmac` workaround
2. Install proposed kernel
3. Test if system hangs -> pass
4. Check if the message "HP X360 detected, skip probing" appears -> yes

Since in the patch it compares the product name in DMI string to decide
if to skip the dw_dmac probing, so no side-effect is expected.

** Tags removed: verification-needed-vivid
** Tags added: verification-done-vivid

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https://bugs.launchpad.net/bugs/1501580

Title:
  Workaround for dw_dmac causing random hang  when booting

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Vivid:
  Fix Committed

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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