[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 #45 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #44)
> I've pushed a completely untested patch series to just shut up vgacon to
> 
> http://cgit.freedesktop.org/~danvet/drm/log/?h=vgacon-crap

Just to document the bug what I said on IRC: this doesn't fix the bug.

Function do_unregister_con_driver() returns -ENODEV, so we don't really unbind
vgacon. This happens because vgacon doesn't have the CON_DRIVER_FLAG_MODULE
flag. The vgacon is not initalized by do_register_con_driver(), it's
initialized by con_init(), though the "conswitchp" variable which is initalized
by arch/x86/kernel/setup.c. I am not sure if it's possible to just uninitialize
vgacon...

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