[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

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #33 from lu hua <huax.lu at intel.com> ---
Run ./drv_module_reload ,It doesn't have any output. 

dmesg:
[  122.577167] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to c400c
[  122.577224] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.577322] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.577422] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 44008
[  122.577521] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.577619] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.577720] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 44008
[  122.577817] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 4400c
[  122.577876] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 4400c
[  122.577974] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44008
[  122.578033] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 44008
[  122.578131] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 4400c
[  122.578189] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register
before interrupt
[  122.578286] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 44008
[  122.578400] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.578526] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.578648] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 4400c
[  122.578729] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to c400c
[  122.578852] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 4400c
[  122.578973] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44008
[  122.579055] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 4400c
[  122.579138] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 4400c
[  122.579197] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 4400c
[  122.579321] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register
before interrupt
[  122.579440] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44008
[  122.579520] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44040
[  122.579576] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to c400c

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