[Bug 56661] Framebuffer on boot causes brightness to go to minimum on HP laptop

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=56661





--- Comment #7 from Ash Willis <ashwillis at programmer.net>  2013-05-24 03:52:57 ---
Created an attachment (id=102371)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=102371)
A patch to enable the backlight on startup on HP Pavilion g6 laptops

Hi Dan, I've got a g6 and it's exhibiting the same behaviour. I'm assuming when
you say the backlight is on its minimum setting, you mean it's completely
turned off? That's the behaviour I'm seeing anyway.

You're right. It seems that there is something up with the HP bios. It does not
correctly report its previous brightness setting so the driver makes the
mistake of 'resuming' it to 0 on initialisation. Please find the attached patch
which will disable the bios check and instead set it to maximum brightness.

A more elegant fix would be to determine how to get some sense out of the bios
but at least this patch should enable the displays of g6 users.

Cheers,

Ash

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