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Re: rawhide report: 20060709 changes



Arjan van de Ven wrote:
On Mon, 2006-07-10 at 15:41 +0200, Ralf Ertzinger wrote:
This may be a dead stupid question, but what do we acutally need this
for? Don't all monitors report their values via DDC these days?

LCD's tend to not do that, and KVMs and stuff like that b0rks DDC as
well...

Actually LCDs are better than most CRTs, external ones anyway. Internal panels sometimes lack a DDC channel (I think some LVDS connectors don't have space for the I2C pins), but ACPI is, in principle, supposed to give you the EDID info in the DSDT in that case. We don't use that block yet, mostly because I don't yet know how to map from ACPI tree node to PCI slot or the reverse, but I'm working on it.

KVM's are a weird breed. I've seen some that will just drop the I2C pins, some that pass it through only for the active node, and at least one in the lab that will provide _fake_ EDID info for the non-active machines (which, helpfully, matches /KVM/). I suspect the answer here is to get the server to cache the EDID info on disk.

- ajax


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