[Bug 42782] IO_PAGE_FAULT while starting xorg

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42782


Tango <tango@thetangos.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tango@thetangos.com




--- Comment #12 from Tango <tango@thetangos.com>  2012-08-29 14:54:38 ---
I have this problem as well.  In my case it seems to be a regression.  My
2.6.37-r4 kernel boots properly and X starts without error.

Been trying sense March to get any stable 3.x.x kernel to boot and start X
properly.  I have had no problems getting them to boot but none would allow me
to start X.

Attempting to start X produces these errors in demsg.
[    8.368285] nvidia: module license 'NVIDIA' taints kernel.
[    8.368289] Disabling lock debugging due to kernel taint
[    8.382108] vgaarb: device changed decodes:
PCI:0000:08:00.0,olddecodes=io+mem,decodes=none:owns=io+mem
[    8.382524] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  295.71  Thu Aug 
2 19:22:08 PDT 2012
[    9.329795] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x000000041a386200 flags=0x0010]
[    9.329812] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x00000004147d0000 flags=0x0010]
[    9.329823] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x00000004147d0040 flags=0x0010]
[    9.329834] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x0000000000006000 flags=0x0000]
[    9.329843] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x0000000000006040 flags=0x0000]
[    9.329853] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x0000000000006080 flags=0x0000]
[    9.329862] AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x0016
address=0x00000000000060c0 flags=0x0000]
[   17.341563] NVRM: RmInitAdapter failed! (0x27:0x38:1190)
[   17.341573] NVRM: rm_init_adapter(0) failed

Early in the kernel boot process all my kernels were reporting,
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM
I verified that IOMMU was in fact enabled in my BIOS.  So I am not sure if that
is just a suggestion or that the kernel isn't detecting the IOMMU settings.

After much research I narrowed the problem down to AMD_IOMMU.  I can boot my
3.4.9-kernel, (configured and striped to absolute essentials for testing) and
start X properly only if I boot it with amd_iommu=off.

Kernel command line: root=/dev/sda3 amd_iommu=off
video=uvesafb:mtrr:3,ywrap,1280x1024-32@75 splash=verbose,theme:livecd-2007.0
console=tty1

My Linux Distro is Gentoo
Portage 2.1.11.9 (default/linux/amd64/10.0, gcc-4.5.4, glibc-2.15-r2,
3.4.9-gentoo x86_64)

System uname:
Linux-3.4.9-gentoo-x86_64-AMD_Phenom-tm-_II_X6_1100T_Processor-with-gentoo-2.1

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