[Bug 81140] [HSW/BYT/BDW Bisected ]system sporadically boot fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81140

--- Comment #24 from liulei <lei.a.liu at intel.com> ---
I notice some differences between debug kernel dmesg and normal kernel dmesg .
Booting with debug kernel(boot up successfully) dmesg like below:
[    5.295520] [drm] Memory usable by graphics device = 2048M
[    5.299528] [drm:i915_gem_gtt_init] GMADR size = 256M
[    5.299531] [drm:i915_gem_gtt_init] GTT stolen size = 32M
[    5.299533] [drm:i915_gem_gtt_init] ppgtt mode: 1
[    5.299535] [drm] Replacing VGA console driver
[    5.314627] checking generic (b0000000 7e9000) vs hw (b0000000 10000000)
[    5.314629] fb: switching to inteldrmfb from EFI VGA
[    5.317939] Console: switching to colour dummy device 80x25
[    5.318122] usb 1-5: new high-speed USB device number 3 using xhci_hcd

Booting with normal kernel(boot failure) dmesg like this:
[   26.898922] [drm] Memory usable by graphics device = 2048M
[   26.898923] [drm] Replacing VGA console driver
[   27.449211] fb: switching to inteldrmfb from EFI VGA

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