Re: fglrx + radeonfb leads to crashes?

["Michel Dänzer" <michel@daenzer.net>]

On Thu, 2004-03-18 at 01:26, Benjamin Herrenschmidt wrote: 
> On Thu, 2004-03-18 at 07:18, David Mosberger wrote:
> > 
> > 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).

Note that I don't have problems switching between radeonfb and an X
server from DRI CVS which sets up the card memory layout in the
recommended way and never restores it. Am I missing something?


-- 
Earthling Michel Dänzer      |     Debian (powerpc), X and DRI developer
Libre software enthusiast    |   http://svcs.affero.net/rm.php?r=daenzer



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