[Bug 68651] KMS+Intel 9600M on Toshiba C75 A 13Q

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68651

--- Comment #23 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to Cyrille Pontvieux from comment #20)
>
> BTW, what is eDP 18bpp configuration? My internal monitor is show as eDP1 by
> xrandr, but I don't know what "bpp" means.

I mentioned this mostly as a documentation for possible other developers
investigating this bug :)

When your BIOS boots, it configures your screen in a way that every pixel has
18 bits (18bpp = 18 bits per pixel). So the framebuffer in memory has 18bpp,
and the panel displays them as 18bpp: no conversion needed.

When our driver loads, it uses a framebuffer that has 24bpp, but since the eDP
panel needs to receive 18bpp, we have to convert the 24bpp of the memory to
18bpp for the panel, and we call this "dithering" :)

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