Bug#465864: xserver-xorg-video-ati: xserver freezes the computer on startup

[Jiří Paleček <jpalecek@web.de>]

On Fri, 15 Feb 2008 19:32:37 +0100, Brice Goglin  
<Brice.Goglin@ens-lyon.org> wrote:

> Jiří Paleček wrote:
> > Package: xserver-xorg-video-ati
> > Version: 1:6.7.198~git20080203.f65e8dfa-1
> > Severity: important
> >
> > Hello
> >
> > when I start X, the computer freezes and doesn't react even to magic
> > SysRq. This happens with -video-ati versions > 6.7.196.
> >
> > The log and the diff to normal startup is attached. I tried option
> > "BusType" "PCI" without positive effect.
>
> The biggest candidate from such a problem appearing after 6.7.196 would
> have been AGP mode problems for sure. But if BusType PCI or AGPMode 4/8
> doesn't help, there's something else.
>
> Since we have plenty of snapshots available in snapshot.debian.net, and
> git-bisect'ing between should be very fast, could you try to locate the
> breaking commit?

OK. The bad commit is

commit f3d2ec3a5ae61215c792018320158750e7aa937c
Author: Alex Deucher <alex@botch2.(none)>
Date:   Tue Dec 11 11:57:27 2007 -0500

    RADEON: rewrite PLL computation

    Algorithm adapted from BeOS radeon driver with some tweaks by me.
    Actually calulate and use the reference divider rather than using the  
bios default.
    Also, always calculate the PLL, rather than falling back to bios  
dividers.
    This should fix bugs 12913, 13590, 13533, possibly others.

Regards
    Jiri Palecek