[Bug 27314] displayport link training fails on certain panels (channel equalization fails)

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Comment # 71 on bug 27314 from
(In reply to comment #69)
> Hi,
> 
> Has anyone been able to get KMS working on a 27" iMac?
> 
> I have an iMac 11,1 and I cannot get X to work. Documentation
> is scarce, so I don't know how to discover what is the problem.
> When I start X, it doesn't show any errors, but I get a blank
> screen. Same for when I insert the radeon module with kms on.
> I suspect that the EDID is not being handled correctly. Does
> any of you know how I can create an external EDID for a 2560x1440
> monitor? My video card is an ATI Radeon HD 4850, by the way.
> 
> I'd appreciate any help. I'm using linux 3.10, and can post dmesg,
> Xorg.0.log, etc. I'd also happily live with a non kms setup, but
> recent X seems to require kms...
> 
> Thank you,

I works for me on the same hardware if I bios boot it. With an EFI boot I get a
black screen like yours.


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