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[Launchpad Bug Tracker <1351014@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty

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https://bugs.launchpad.net/bugs/1351014

Title:
  Extessive timeout warning on some machines with i915_bdw

Status in HWE Next Project:
  New
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  In Progress

Bug description:
  SRU Justification:

  Impact: Kernel warning every boot making it seem like the system is faulty but it is harmless. This only applies to i915_bdw on trusty, and is impacting certification on some prerelease machines.
  Fix: Upstream increased the timeout required to hit it so it will not affect the machines we have anymore in 3.14, and also demoted it from a warning to DRM_INFO_ONCE.
  Testcase: Boot trusty on an affected broadwell machine, check dmesg for warning

  [Results]
  Expected: There should be no WARNING messages for i915_bdw.
  Actual: This warning is displayed

  [   13.157688] ------------[ cut here ]------------
  [   13.157726] WARNING: CPU: 3 PID: 395 at /build/buildd/linux-3.13.0/ubuntu/i915/intel_opregion.c:266 swsci+0x2ec/0x300 [i915_bdw]()
  [   13.157729] excessive driver sleep timeout (DSPL) 1000
  [   13.157732] Modules linked in: crct10dif_pclmul(+) lib80211_crypt_tkip crc32_pclmul ghash_clmulni_intel aesni_intel snd_hda_intel(OF+) snd_hda_controller(OF) aes_x86_64 snd_hda_codec(OF) snd_hwdep lrw gf128mul snd_pcm glue_helper ablk_helper cryptd wl(POF+) lib80211 snd_seq_midi snd_seq_midi_event cfg80211 snd_rawmidi serio_raw i915_bdw(+) snd_seq snd_page_alloc snd_seq_device snd_timer lpc_ich mei_me mei snd soundcore drm_kms_helper drm i2c_algo_bit parport_pc ppdev mac_hid acpi_pad lp parport btrfs xor raid6_pq libcrc32c dm_mirror dm_region_hash dm_log usbhid hid ahci libahci wmi video
  [   13.157779] CPU: 3 PID: 395 Comm: systemd-udevd Tainted: PF          O 3.13.0-32-generic #57-Ubuntu
  [   13.157783] Hardware name: Dell Inc. FOOBAR, BIOS R21 07/17/2014
  [   13.157785]  0000000000000009 ffff880156921818 ffffffff8171bcb4 ffff880156921860
  [   13.157790]  ffff880156921850 ffffffff810676cd ffffc900106a0218 ffff88003598d800
  [   13.157794]  00000000000001f4 0000000000000008 ffff880156921928 ffff8801569218b0
  [   13.157799] Call Trace:
  [   13.157807]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
  [   13.157812]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
  [   13.157815]  [<ffffffff8106773c>] warn_slowpath_fmt+0x4c/0x50
  [   13.157847]  [<ffffffffa02bc21c>] swsci+0x2ec/0x300 [i915_bdw]
  [   13.157870]  [<ffffffffa02bd044>] intel_opregion_setup+0x204/0x3f0 [i915_bdw]
  [   13.157903]  [<ffffffffa02e2c7f>] i915_driver_load+0x5cf/0xf90 [i915_bdw]
  [   13.157927]  [<ffffffffa01a2ce2>] drm_dev_register+0xa2/0x1e0 [drm]
  [   13.157943]  [<ffffffffa01a4be2>] drm_get_pci_dev+0x92/0x140 [drm]
  [   13.157966]  [<ffffffffa02636eb>] i915_pci_probe+0x3b/0x60 [i915_bdw]
  [   13.157972]  [<ffffffff813a61e5>] local_pci_probe+0x45/0xa0
  [   13.157976]  [<ffffffff813a7485>] ? pci_match_device+0xc5/0xd0
  [   13.157981]  [<ffffffff813a75a9>] pci_device_probe+0xd9/0x130
  [   13.157987]  [<ffffffff8149355d>] driver_probe_device+0x12d/0x3e0
  [   13.157991]  [<ffffffff814938e3>] __driver_attach+0x93/0xa0
  [   13.157995]  [<ffffffff81493850>] ? __device_attach+0x40/0x40
  [   13.158000]  [<ffffffff814914c3>] bus_for_each_dev+0x63/0xa0
  [   13.158004]  [<ffffffff81492f0e>] driver_attach+0x1e/0x20
  [   13.158007]  [<ffffffff81492af0>] bus_add_driver+0x180/0x250
  [   13.158013]  [<ffffffffa032f000>] ? 0xffffffffa032efff
  [   13.158017]  [<ffffffff81493f64>] driver_register+0x64/0xf0
  [   13.158021]  [<ffffffffa032f000>] ? 0xffffffffa032efff
  [   13.158026]  [<ffffffff813a5b7c>] __pci_register_driver+0x4c/0x50
  [   13.158039]  [<ffffffffa01a4daa>] drm_pci_init+0x11a/0x130 [drm]
  [   13.158044]  [<ffffffffa032f000>] ? 0xffffffffa032efff
  [   13.158066]  [<ffffffffa032f06a>] i915_init+0x6a/0x6c [i915_bdw]
  [   13.158070]  [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
  [   13.158076]  [<ffffffff810598d3>] ? set_memory_nx+0x43/0x50
  [   13.158082]  [<ffffffff810e1f8d>] load_module+0x12dd/0x1b40
  [   13.158087]  [<ffffffff810dda30>] ? store_uevent+0x40/0x40
  [   13.158093]  [<ffffffff810e2966>] SyS_finit_module+0x86/0xb0
  [   13.158098]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6
  [   13.158101] ---[ end trace 5b57c64d53011e99 ]---

  [Additional Information]
  Base Image: somerville-trusty-amd64-iso-20140620-0.iso
  Kernel Version: 3.13.0-32-generic
  CPU: Genuine Intel(R) CPU 0000 @ 1.60GHz
  GPU: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 06)

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