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Re: [Qemu-devel] Questions about EDID
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] Questions about EDID |
Date: |
Thu, 28 Feb 2019 07:38:12 +0100 |
User-agent: |
NeoMutt/20180716 |
On Thu, Feb 28, 2019 at 06:01:30AM +0000, Mark Cave-Ayland wrote:
> On 28/02/2019 05:49, Gerd Hoffmann wrote:
>
> > Hi,
> >
> >> Right, at the moment all the MacOS driver does is parse the resolution
> >> list from the
> >> EDID and add them to the dropdown list - it doesn't support the xres and
> >> yres properties.
> >
> >> The main reason for this that OpenBIOS currently makes use of the -g XxYxD
> >> parameter
> >> to set up the display resolution and bit depth, and AFAICT we currently
> >> only have
> >> access to the X and Y resolutions via the EDID blob. So it's not clear
> >> whether EDID
> >> can completely replace the existing mechanism yet.
> >
> > EDID can only propagate x + y, not depth.
>
> Right - my quick reading online was that there was very limited depth
> capability, and
> certainly nothing greater than 16-bit.
That is another depth, it's the bits *per color* the monitor is able to
display.
> Rather than duplicating these parameters, would it make sense to come up with
> a
> custom QEMU extension block to hold the extra depth information?
Well, not really. EDID is about monitor capabilities. The monitor will
see 8 bit per color channel, no matter whenever your GPU composes that
signal using a 8bpp mode + color palette or 24bpp mode with direct
color.
cheers,
Gerd
- [Qemu-devel] Questions about EDID, G 3, 2019/02/25
- Re: [Qemu-devel] Questions about EDID, Gerd Hoffmann, 2019/02/25
- Re: [Qemu-devel] Questions about EDID, Programmingkid, 2019/02/25
- Re: [Qemu-devel] Questions about EDID, Gerd Hoffmann, 2019/02/26
- Re: [Qemu-devel] Questions about EDID, G 3, 2019/02/26
- Re: [Qemu-devel] Questions about EDID, Gerd Hoffmann, 2019/02/27
- Re: [Qemu-devel] Questions about EDID, Programmingkid, 2019/02/27
- Re: [Qemu-devel] Questions about EDID, Mark Cave-Ayland, 2019/02/28
- Re: [Qemu-devel] Questions about EDID, Gerd Hoffmann, 2019/02/28
- Re: [Qemu-devel] Questions about EDID, Mark Cave-Ayland, 2019/02/28
- Re: [Qemu-devel] Questions about EDID,
Gerd Hoffmann <=
- Re: [Qemu-devel] Questions about EDID, Mark Cave-Ayland, 2019/02/28
- Re: [Qemu-devel] Questions about EDID, G 3, 2019/02/28