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Re: iMac-G3 fails to boot with 2.6.37-1-powerpc (Bug#614221)

On Sat, 2011-03-05 at 16:19 -0300, Gunther Furtado wrote:
> Em 05.Mar.2011 (sábado), Risto Suominen <risto.suominen@gmail.com>
> disse:
> > I would try video=ofonly.
> > 
> And you would correct!
> Just added _ append="video=ofonly" _ to /etc/yaboot.conf, run ybin and
> rebooted into 2.6.37-2-powerpc which did not complete the booting
> procces just the way 2.6.37-1-powerpc did.

This also works on a PowerBook G4 here.  Presumably, without this
vga16fb tries to take over from offb, and this does not work.  I didn't
imagine that it would try to do that!

* Has anyone tested 2.6.37-{1,2} on a non-Mac system yet, and does
vga16fb work there?

Using this parameter, I can get as far as running some of the init
scripts, but as soon as the radeon driver (*not* radeonfb) is loaded -
either by udev or the X server, depending on modprobe configuration -
the screen goes black - handover from offb to radeon is not working.

I also tested 2.6.38-rc6-1~experimental.1.  Here, the radeon driver
prints a few lines, ending with:

"fb: conflicting fb hw usage radeondrmfrb vs OFfb ATY,Xia_A - removing
generic driver"

and then nothing more is displayed on the screen (though the system is
otherwise alive).  So it seems that radeon is not yet able to take over
from offb and we need to stay with radeonfb and UMS in X for now.

* Could some Mac users test and report whether i915 or nouveau can
successfully take over the display from offb in 2.6.37 or 2.6.38-rc6?


Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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