[Bug 57365] [i945GM regression] kernel 3.7-rc1 onwards. backlight on, screen dark after KMS kicks in during boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57365

--- Comment #5 from Tomas M. <tmezzadra at gmail.com> ---
(In reply to comment #4)
> Can you please grab the latest intel-gpu-tools
> (http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/) and then run the
> intel_reg_dumper tool both on a working and a broken kernel?
> 
> The bisected commit makes some sense, since after that we drop a bunch of
> spurious state-transitions. Could be that those papered over some bugs and
> now we can't enable the hw correctly any longer.

what do you make of this error?

#  intel_reg_dumper
Gen2/3 Ranges are not supported. Please use unsafe access.Aborted

i cant find out how to use "unsafe access". any hint?

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