KMS on Sandy bridge error device_attach

[Konstantin Belousov]

On Sat, Jun 23, 2012 at 09:25:40AM +0200, Thomas Zander wrote:
> On Fri, Jun 22, 2012 at 8:38 PM, Konstantin Belousov
> <kostikbel at gmail.com> wrote:
> >> Thank you for your quick response. Output is attached.
> >> This is probably one of the relatively rarely sold CPUs, so I might
> >> have an edge case here...
> > Yes, indeed, this is something Intel calls 'SandyBridge server Integrated
> > Graphics'. The device id is known to agp driver, but probably it failed
> > to attach due to some (mis)interpretation of the state.
> >
> > Your dmesg is not complete, the hda output displaced the previous
> > messages which contained the agp attach diagnostic. Take agp or hda
> > out from kernel, and rerun the test. Or, increase MSGBUF_SIZE, see
> > conf/NOTES for description.
> 
> Okay, thanks again. As you suggested, I have removed a few kernel
> modules from the boot process and it seems that the verbose dmesg
> output now fits into the buffer, see attached dmesg output.
> However I don't see more GPU attach diagnostic. Do I miss something?
Ok, but you did not tried to load i915kms, at least the dmesg you posted
lacks an indication.

Let me repeat: I need to see the lines related to the agp probe and
attachment, I believe that it will show us the next direction to
investigate.
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