[Bug 263334] [NEW] Kernel hangs on boot with Matrox Millenium G450

[chgarde]

Public bug reported:

Binary package hint: linux-image

As soon as the kernel is loaded, it hangs (or sometimes reboot)
just after displaying "Starting up..." 

This bug has been reproduced on 2 different x86 machines with the same Matrox card :
1. COMPAQ AP230 1GhZ - Intel Pentium III (attached files come from this one)
2. Generic Intel Celeron 1Ghz

The card (see attached output from lspci -vvv) is :
Matrox Graphics, Inc. Millennium G450 32Mb SDRAM Dual Head

Ubuntu kernels 2.6.24 and 2.6.27 are affected. (linux-image-2.6.24/7)

The only way I found out to prevent this hangup was to disable the option CONFIG_FIRMWARE_EDID in the kernel.
Symbol: FIRMWARE_EDID [=y]
Prompt: Enable firmware EDID
Defined at drivers/video/Kconfig:56
Depends on: HAS_IOMEM && FB
Location:
-> Device Drivers
  -> Graphics support
     -> Support for frame buffer devices (FB [=y])

Please note that 
- Passing the nofb parameter at boot has no effect
- neither does the parameter video=vesafb:noedid,(...)

If we want Ubuntu to boot on this hardware, I can see 2 options :
- disable CONFIG_FIRMWARE_EDID by default (I don't have any idea of the impact of doing this)
- patch the kernel to add a boot parameter to be able to disable EDID at runtime on Ubuntu kernels
- At least, put a kernel with CONFIG_FIRMWARE_EDID=n on the alternate install CD.

Do not hesitate to contact me for any further information.
Regards,
chris.

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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Kernel hangs on boot with Matrox Millenium G450
https://bugs.launchpad.net/bugs/263334
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