Re: Regression: radeonfb: No synchronisation on CRT with linux-2.6.13-rc5

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

On Fri, 2005-08-05 at 19:38 +0200, Bodo Eggert wrote:
> On Fri, 5 Aug 2005, Benjamin Herrenschmidt wrote:
> 
> > On Fri, 2005-08-05 at 00:03 +0200, Bodo Eggert wrote:
> > > My CRT is out of sync after radeonfb from 2.6.13-rc5 is initialized. 
> > > 2.6.12 does not show this behaviour.
> > 
> > I'm out of town at the moment, could you maybe diff radeonfb between
> > working & non-working and CC me the diff ? I don't have my work stuff at
> > hand not my kernel images so...
> 
> There were no changes in radeonfb.c, but I could trace to to 
> CONFIG_PREEMPT. With _NONE, it works as expected.

Ah ! Interesting... I don't see why PREEMPT would affect radeonfb
though ... Can you try something like wrapper radeon_write_mode() with
preempt_disable()/preempt_enable() and tell me if it makes a
difference ?

Ben.


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