On Thu, 2004-03-18 at 07:18, David Mosberger wrote:

Hi Ani,

I have a machine here with an ATI FireGL Z1 card.  It works fine with
the ATI fglrx binary-only driver on 2.6.5-rc1.  However, if radeonfb
is enabled and I try to stop the X server or switch away from it to
another virtual console, then the screen display gets all messed up
and the machine gets stuck.  When this hapens, I periodically see this
kind of message:

  radeonfb: FIFO Timeout !

Now, this is on ia64 machine so at this point I'm just wondering
whether this problem also shows up on other machines.  If it's an
ia64-specific problem, I can look into it.  Otherwise, I guess I'll
just disable radeonfp for now.

This is a known problem. I'm not sure at this point what ATI binary
driver is doing, I think it messes up the card internal memory map,
among others, and it definitely doesn't restore things properly when
beeing switched out.

I only have PPC machines so I can't experiment with it myself though.
The "fix" might be as simple as restoring MC_FB_LOCATION,
MC_AGP_LOCATION and the various offset when re-initing the mode (the
latest fbdev will trigger a mode restore & engine reset when switching
out from a KD_GRAPHICS console).

Ben.




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