[Bug 67813] [HSW bisected]igt/module_reload causes [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44004 and system hang with headless, with power well disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67813

--- Comment #16 from lu hua <huax.lu at intel.com> ---
I added drm.debug=0xe.

# lsmod
Module                  Size  Used by
dm_mod                 58278  0
iTCO_wdt                4535  1
iTCO_vendor_support     1584  1 iTCO_wdt
snd_hda_codec_realtek    32195  1
pcspkr                  1675  0
i2c_i801                8342  0
lpc_ich                12616  0
mfd_core                2401  1 lpc_ich
snd_hda_intel          24636  0
snd_hda_codec          98736  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep               5141  1 snd_hda_codec
snd_pcm                66617  2 snd_hda_codec,snd_hda_intel
snd_page_alloc          5906  2 snd_pcm,snd_hda_intel
snd_timer              15318  1 snd_pcm
snd                    50129  6
snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_pcm,snd_hda_codec,snd_hda_intel
soundcore               4210  1 snd
battery                10931  0
ac                      3999  0
acpi_cpufreq            6339  0
i915                  529852  1
video                  11092  1 i915
button                  4333  1 i915
drm_kms_helper         22788  1 i915
drm                   195808  2 i915,drm_kms_helper
mperf                   1027  1 acpi_cpufreq
freq_table              2092  1 acpi_cpufreq

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