[Bug 544988] [NEW] Intel 82855PM AGP stuck at 1x mode

[Wenzhuo Zhang]

Public bug reported:

I upgraded my ThinkPad X32 to Ubuntu 10.04 beta last weekend. I noticed
that the 4x AGP video adapter (ATI Technologies Inc Radeon Mobility M6
LY) is stuck at 1x mode.

$ dmesg | grep -i agp
[    0.098646] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.AGP_._PRT]
[   16.687261] Linux agpgart interface v0.103
[   16.801167] agpgart-intel 0000:00:00.0: Intel 855PM Chipset
[   16.914364] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xd0000000
[   17.273550] agpgart-intel 0000:00:00.0: AGP 2.0 bridge
[   17.273572] agpgart-intel 0000:00:00.0: putting AGP V2 device into 1x mode
[   17.273609] radeon 0000:01:00.0: putting AGP V2 device into 1x mode

and setting the AGPMode option in the Device section of
/etc/X11/xorg.conf no longer works:

$ grep -i agp /var/log/Xorg.0.log
...
(--) RADEON(0): Chipset: "ATI Radeon Mobility M6 LY (AGP)" (ChipID = 0x4c59)
(II) RADEON(0): AGP card detected
(WW) RADEON(0): Option "AGPMode" is not used

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

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Intel 82855PM AGP stuck at 1x mode
https://bugs.launchpad.net/bugs/544988
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