Comment 89 for bug 430694

Have an Inspiron 15n that has a:

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)

Trying the fix in comment #71 DOES NOT fix the issue. It will still fail at times.

This is what I did to produce the problem.
Running on Battery power:
1) Boot from cold boot (works)
2) Restart ... KMS fails on boot .. you notice the Ubuntu logo is fuzzy (meanig not at LCD native res) .. also X is slow
3) Restart .... KMS fails .. blah blah
4) Restart ... KMS fails .. blah blah

Looks like if you run off battery you can get one good boot then restart and fails every time. This is how I can accurately reproduce the issue.

I see this from the kernel messages when it fails:
[ 3.093703] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 3.093710] i915 0000:00:02.0: setting latency timer to 64
[ 3.093725] [drm:drm_fill_in_dev] *ERROR* Cannot initialize the agpgart module.
[ 3.093771] [drm:intelfb_restore] *ERROR* Failed to restore crtc configuration: -22
[ 3.093815] DRM: Fill_in_dev failed.
[ 3.093854] i915 0000:00:02.0: PCI INT A disabled
[ 3.093860] i915: probe of 0000:00:02.0 failed with error -22
[ 3.096854] agpgart-intel 0000:00:00.0: Intel Mobile Intel® GM45 Express Chipset
[ 3.097455] agpgart-intel 0000:00:00.0: detected 32764K stolen memory
[ 3.100916] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xe0000000