Re: rc6 keeps hanging and blanking displays

[Linus Torvalds <torvalds@osdl.org>]

On Tue, 16 Aug 2005, Helge Hafting wrote:
>
> I tried rc6 with DRM turned off.  That kernel consistently _died_ when 
> trying to start xdm. Xorg logs for both cards ended like this:
> 
> (II) LoadModule: "pcidata"
> (II) Loading /usr/X11R6/lib/modules/libpcidata.a

Ok, it does sound like your X server is doing something nasty on the PCI 
bus. 

> I can retry this with a syncronously mounted /var, if the last lines
> of the Xorg logs might be interesting.

It would be even more interesting if you have a serial console, but if
this is the X server stomping on the PCI bus, you might just have a total
lockup - no oops, no nothing.

One thing that might be interesting is to see if the old working kernel
has a different IO-map than the broken ones. A simple

	cat /proc/ioports /proc/iomem > iomaps.kernel-version

and diffing the two might be an interesting thing to try. X has been known
to sometimes just try to re-configure things on its own without telling
(or asking) the kernel.

			Linus
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