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

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Phidias <phidias.chiang@xxxxxxxxxxxxx>
Date: Thu, 08 Oct 2015 06:27:15 -0000
Reply-to: Bug 1501580 <1501580@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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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

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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