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[Pasquale Fiorillo <pasquale.fiorillo@xxxxxxxxx>]

Public bug reported:

On Asus UX303LNB.206 running Ubuntu 14.04 LTS with "intel_iommu=on" added to the Linux kernel boot parameters, DMAR fault messages are logged in dmesg:
...
[   18.611067] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f1000 
[   18.611067] DMAR:[fault reason 23] Unknown
[   18.611069] dmar: DRHD: handling fault status reg 2
[   18.611071] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f4000 
[   18.611071] DMAR:[fault reason 23] Unknown
[   18.611073] dmar: DRHD: handling fault status reg 2
[   18.611076] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f7000 
[   18.611076] DMAR:[fault reason 23] Unknown
[   18.611079] dmar: DRHD: handling fault status reg 2
[   18.611081] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f9000 
[   18.611081] DMAR:[fault reason 23] Unknown
[   18.611083] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1fa000 
[   18.611083] DMAR:[fault reason 23] Unknown
[   18.611087] dmar: DRHD: handling fault status reg 2
[   18.611088] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1fd000 
[   18.611088] DMAR:[fault reason 23] Unknown
[   24.807264] [drm] stuck on render ring
[   24.808030] [drm] GPU HANG: ecode 8:0:0x00f7ffe1, in Xorg [1499], reason: Ring hung, action: reset
[   24.808032] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[   24.808033] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[   24.808034] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[   24.808035] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[   24.808036] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[   24.815267] drm/i915: Resetting chip after gpu hang
[   24.818413] dmar: DRHD: handling fault status reg 2
[   24.818420] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr 468a000 
[   24.818420] DMAR:[fault reason 23] Unknown
[   30.810311] [drm] stuck on render ring
[   30.811007] [drm] GPU HANG: ecode 8:0:0xc0dfffff, in Xorg [1499], reason: Ring hung, action: reset
[   30.811098] [drm:i915_set_reset_status.part.38 [i915]] *ERROR* gpu hanging too fast, banning!
[   30.818281] drm/i915: Resetting chip after gpu hang

** Affects: apport (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dmar i915 iommu iwlwifi

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https://bugs.launchpad.net/bugs/1468539

Title:
  DMAR Fault on Intel Wireless 7265 (iwlwifi) when Linux
  "intel_iommu=on" Kernel Boot Parameter Is used on Asus UX303LNB.206

Status in apport package in Ubuntu:
  New

Bug description:
  On Asus UX303LNB.206 running Ubuntu 14.04 LTS with "intel_iommu=on" added to the Linux kernel boot parameters, DMAR fault messages are logged in dmesg:
  ...
  [   18.611067] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f1000 
  [   18.611067] DMAR:[fault reason 23] Unknown
  [   18.611069] dmar: DRHD: handling fault status reg 2
  [   18.611071] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f4000 
  [   18.611071] DMAR:[fault reason 23] Unknown
  [   18.611073] dmar: DRHD: handling fault status reg 2
  [   18.611076] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f7000 
  [   18.611076] DMAR:[fault reason 23] Unknown
  [   18.611079] dmar: DRHD: handling fault status reg 2
  [   18.611081] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1f9000 
  [   18.611081] DMAR:[fault reason 23] Unknown
  [   18.611083] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1fa000 
  [   18.611083] DMAR:[fault reason 23] Unknown
  [   18.611087] dmar: DRHD: handling fault status reg 2
  [   18.611088] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr bb1fd000 
  [   18.611088] DMAR:[fault reason 23] Unknown
  [   24.807264] [drm] stuck on render ring
  [   24.808030] [drm] GPU HANG: ecode 8:0:0x00f7ffe1, in Xorg [1499], reason: Ring hung, action: reset
  [   24.808032] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  [   24.808033] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  [   24.808034] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  [   24.808035] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  [   24.808036] [drm] GPU crash dump saved to /sys/class/drm/card0/error
  [   24.815267] drm/i915: Resetting chip after gpu hang
  [   24.818413] dmar: DRHD: handling fault status reg 2
  [   24.818420] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr 468a000 
  [   24.818420] DMAR:[fault reason 23] Unknown
  [   30.810311] [drm] stuck on render ring
  [   30.811007] [drm] GPU HANG: ecode 8:0:0xc0dfffff, in Xorg [1499], reason: Ring hung, action: reset
  [   30.811098] [drm:i915_set_reset_status.part.38 [i915]] *ERROR* gpu hanging too fast, banning!
  [   30.818281] drm/i915: Resetting chip after gpu hang

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