Subject: Re: Intel D945GNT crashes with AGP enabled
From: Marcel Holtmann <marcel@holtmann.org>
To: Dave Jones <davej@redhat.com>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <1130518160.5372.6.camel@blade>
References: <1130506715.5345.7.camel@blade>
	 <20051028162806.GA4340@redhat.com>  <1130518160.5372.6.camel@blade>
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Date: Sat, 29 Oct 2005 13:27:47 +0200
Message-Id: <1130585267.5360.12.camel@blade>
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Hi Dave,

> >  > The problematic part is the Intel AGP module (intel_agp), because if I
> >  > don't compile it the system works fine. There is an oops coming, but so
> >  > far I wasn't able to get it out. Does anyone have seen this problem
> >  > before and have some patches for me to try? Otherwise I need to try to
> >  > get this oops message.
> > 
> > You never mentioned what kernel you're running.
> > If it's a recent -mm, there's an AGP optimisation patch to do less
> > frequent TLB flushes, which may be worth backing out.
> > 
> > If you're running mainline, I'm puzzled.
> 
> basically I am running mainline, but I also tried your agpgart tree and
> both are having problems.

I also checked a non-SMP and non-preempt kernel. Both make my system
crash when killing the X server.

> > It'd be useful to see that oops.
> 
> I am working on it and actually it is enough to just kill the X process
> to crash the system. I saw parts of the oops and it seems that there are
> some RCU calls in the backtrace, but this might not help at all. So it
> seems that I really need that oops.

So getting the oops is really hard. I can't get it via serial port and
the netconsole (it uses an e100) is also not working. I tried to run
framebuffer, but I can only use vesafb and the resolution is nothing
better than any text console and I wasn't able to change it. So taking a
picture of the oops is also not an option. What other possible ways I
have to finally get the oops out of the system?

And btw why can't I compile the intelfb on x86_64? I use the internal
graphics card (8086:2772) of the D945GNT motherboard.

0000:00:02.0 VGA compatible controller: Intel Corporation 945G Integrated Graphics Controller (rev 02)

The Kconfig file makes it unselectable on x86_64 system.

config FB_INTEL
        tristate "Intel 830M/845G/852GM/855GM/865G support (EXPERIMENTAL)"
        depends on FB && EXPERIMENTAL && PCI && X86 && !X86_64

It seems that the most recent support in this driver is for the 915G and
not for the 945G. Are they so different that we need a complete new
driver or is the !X86_64 a relict from old times?

Regards

Marcel


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