[Bug 67191] brightness reset to 0 at boot?

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67191

--- Comment #31 from ff11 <ferion at ibest.com.br> ---
Because plugin some monitor on VGA input workaround this bug for me, I'm using
the kernel parameter "video=VGA-1:e".

* This bug happen to me since the 3.12 to 3.13.6 for what I have tested.

* When I boot without VGA input or force VGA enable, it's just some black
screen. But is not the brightness, I have used setpci direct on the hardware
for set it to max on boot script, and the result is just high brightness black
screen.

* When I boot with VGA input or force VGA enable (kernel parameter
"video=VGA-1:e") the LVDS work again (not black screen anymore).

* When I boot without VGA input or force VGA enable, it's just some black
screen. But if I plugin some VGA monitor, the screen go back to the normal at
this moment (not need to reboot)

I posted some logs. The discussion on gentoo forum is in:
https://forums.gentoo.org/viewtopic-t-977360.html

If you need more information, just ask.

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