VESA, EDID & flat panels

[Thomas Winischhofer]

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Benjamin Herrenschmidt wrote:
> Hi !
> 
> Somebody around here has access to the VESA specs ? I'm trying to figure
> out if the EDID block, at least on recent flat panels, tells us wether
> the panel digital input is 6:6:6 or 8:8:8 ... If it's 6:6:6, we should
> enable dithering in drivers like radeon and "nv", while if 8:8:8, we
> should not. If not enabling it on a 6 bits panel, we end up with crappy
> looking gradients, if enabling it on a 8 bits panel, we basically end up
> sending a 6 bits signal to a 8 bits panel, thus reducing the quality.

AFAIK, there is no way to find out with EDID 1.x. EDID V2 has specific
color information fields, but is hardly used (I have never seen a device
delivering such a thing). I think it's even declared obsolete in the
meantime.

I currently live (well, I must say) on the assumption that TMDS panels
always are 24bit. For LVDS, the BIOSes carry a bit which I read out though.

- --
Thomas Winischhofer
Vienna/Austria
thomas AT winischhofer DOT net          http://www.winischhofer.net/

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