Bug#438458: linux-image-2.6.18-5-686-bigmem: All freezes on boot after message "agpgart:

[Henrik Wallén <henrik.wallen@tkk.fi>]

On Thu, Sep 06, 2007 at 12:16:21AM -0600, dann frazier wrote:

> I've been assuming this bug is fixed
> upstream, but I'm not seeing an obvious fix. Let's check that first,
> and maybe it'll help narrow down the fix.

I have the same motherboard as Jari (Asus P5B) and my computer also freezes
after the message: "agpgart: Detected an Intel 965G Chipset."
The P5B mobo has an Intel 965 chipset (not 965G), and therefore, I
believe the following patch in 2.6.22 solves the problem: 

--- (from http://www.eu.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22)

commit 47d46379eb66278107947729e34a833c76dca252
Author: Wang Zhenyu <zhenyu.z.wang@intel.com>
Date:   Thu Jun 21 13:43:18 2007 +0800

    [AGPGART] intel_agp: don't load if no IGD and AGP port
    
    After i915 chip, GMCH has no AGP port. Origin bridge driver in device
    table will try to access illegal regs like APBASE, APSIZE, etc. This
    may cause problem.
    
    So mark them as NULL in the table, we won't load if no IGD got detect
    and bridge has no AGP port.
    
    Signed-off-by: Wang Zhenyu <zhenyu.z.wang@intel.com>
    Signed-off-by: Dave Jones <davej@redhat.com>

---

I have tried the following kernels:

linux-image-2.6.18-4-amd64    2.6.18.dfsg.1-12etch2    OK
linux-image-2.6.18-5-amd64    2.6.18.dfsg.1-13         freezes
linux-image-2.6.18-5-amd64    2.6.18.dfsg.1-13etch1    freezes
linux-image-2.6.18-5-amd64    2.6.18.dfsg.1-13etch2    freezes
linux-image-2.6.21-2-amd64    2.6.21-6                 freezes
linux-image-2.6.22-2-amd64    2.6.22-4                 OK

In all cases the freeze is after the message "agpgart: Detected an Intel 965G
Chipset."

Using 2.6.18-4 or 2.6.22-2, the intel_agp-module can be loaded without
detecting an 965G chipset.


  Henrik Wallén