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Bug#347186: linux-image-2.6.14-2-alpha-generic: garbled Matrox framebuffer

On Mon, Jan 09, 2006 at 12:09:43PM +0100, Sven Luther wrote:
> On Mon, Jan 09, 2006 at 02:51:46AM -0800, Steve Langasek wrote:
> > On Mon, Jan 09, 2006 at 10:35:18AM +0100, Sven Luther wrote:
> > > On Mon, Jan 09, 2006 at 01:08:49AM -0800, Steve Langasek wrote:
> > > > Package: linux-2.6
> > > > Version: 2.6.14-7
> > > > Severity: important

> > > > Sigh, can't get a break with alpha kernel support around here.  After
> > > > upgrading to 2.6.14 (from 2.4.27), the Matrox framebuffer no longer works
> > > > correctly on my alpha with a Matrox Millenium II.  The matroxfb_base module
> > > > loads without error, but gives me corrupt video output only.

> > > Try turning off acceleration.

> > Doesn't make a difference.

> > What did make a difference was, after googling, loading fbcon manually
> > before loading matroxfb_base.  Given that I'm loading matroxfb_base by hand
> > (/etc/modules), it's not getting loaded via udev or anything like that, it
> > seems to me that it's my responsibility to load fbcon by hand as well, but

> Indeed, if you load it by hand, you need to load fbcon also. Maybe there
> should be a dependency between matroxfb and fbcon, which modprobe would then
> take care of, but i guess it also makes sense to use matroxfb without fbcon,
> or something.

Well, depmod dependencies are based on who uses symbols from what --
obviously matroxfb doesn't *need* fbcon in order to load and be used.  And
one may have their console on a different video card with no framebuffer

If any change is to be made here to enforce auto-loading of fbcon, it seems
to me that it makes more sense to just build fbcon into the kernel instead
of doing dances with the initramfs managers.

> > it's still something of an unexpected change from 2.4.  It might be nice to
> > have these modules all autoloaded by something, but it's not strictly
> > necessary, and some users may not want the framebuffer activated
> > automatically?

> I think that if you configure yaird to load in matroxfb, it should then also
> load fbcon.

Well, first of all, I'm not using yaird...

> > The other issue (and the first thing I was trying to get work, which led me
> > to believe the fb was completely broken) is that, even though console works
> > on the framebuffer now, X does not.  This breakage corresponds to the kernel
> > upgrade, not to any changes in X, so still looks like a kernel bug to me.

> What X version are you using ? 

6.8.2.dfsg.1-1; I've just upgraded to 6.9.0.dfsg.1-2, but haven't restarted
anything yet.

Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
vorlon@debian.org                                   http://www.debian.org/

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