Re: commit b1ee26b "radeonfb: accelerate imageblit and other improvements" freezes system on switching from X to text console

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2008-11-26 at 00:13 +0100, Gaudenz Steinlin wrote:
> On Tue, Nov 25, 2008 at 08:44:57PM +0100, Gaudenz Steinlin wrote:
> > Hi Ben
> > 
> > The changes in the commit mentioned in the subject freeze my system when
> > changing from X to a text console. The system freezes with a garbled
> > display. Reverting this commit fixes the problem.
> > 
> > The freeze only happens if DRI is enabled in X. It also does not happen
> > if I simply switch between different text consoles. 
> > 
> 
> OK, I searched a bit more and found
> http://bugzilla.kernel.org/show_bug.cgi?id=11875 which is possibly
> related. I also found the patch Ben proposed to fix this at
> http://lkml.org/lkml/2008/11/10/12. Unfortunately this patch did not fix
> my problem. 

The fix is for a different problem. I suspect the root cause is a bug in
X but I'm still trying to track it down.

I think I'll just do a patch that make the new acceleration conditional
on a kernel command line option for .28 final ...

Cheers,
Ben.