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Subject[BUG] i915 boot got black screen with 2.6.37-rc5+
The right log with 2.6.37-rc3+:
Dec 15 16:13:03 teawater-workpc kernel: [ 14.569871] [drm] Initialized
drm 1.1.0 20060810
Dec 15 16:13:03 teawater-workpc kernel: [ 14.882768] i915
0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Dec 15 16:13:03 teawater-workpc kernel: [ 14.882775] i915
0000:00:02.0: setting latency timer to 64
Dec 15 16:13:03 teawater-workpc kernel: [ 14.894778] mtrr: type
mismatch for d0000000,10000000 old: write-back new: write-combining
Dec 15 16:13:03 teawater-workpc kernel: [ 14.894781] [drm] MTRR
allocation failed. Graphics performance may suffer.
Dec 15 16:13:03 teawater-workpc kernel: [ 14.895367] i915
0000:00:02.0: irq 43 for MSI/MSI-X
Dec 15 16:13:03 teawater-workpc kernel: [ 14.895610] vgaarb: device
changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
Dec 15 16:13:03 teawater-workpc kernel: [ 14.895927] [drm] initialized
overlay support
Dec 15 16:13:03 teawater-workpc kernel: [ 14.981492] Console:
switching to colour frame buffer device 210x65
Dec 15 16:13:03 teawater-workpc kernel: [ 14.986676] fb0: inteldrmfb
frame buffer device
Dec 15 16:13:03 teawater-workpc kernel: [ 14.986678] drm: registered
panic notifier
Dec 15 16:13:03 teawater-workpc kernel: [ 14.986761] [drm] Initialized
i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

The black log with 2.6.37-rc5+:
Dec 15 16:10:51 teawater-workpc kernel: [ 12.418419] [drm] Initialized
drm 1.1.0 20060810
Dec 15 16:10:51 teawater-workpc kernel: [ 12.945240] i915
0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Dec 15 16:10:51 teawater-workpc kernel: [ 12.945246] i915
0000:00:02.0: setting latency timer to 64
Dec 15 16:10:51 teawater-workpc kernel: [ 12.957555] mtrr: type
mismatch for d0000000,10000000 old: write-back new: write-combining
Dec 15 16:10:51 teawater-workpc kernel: [ 12.957559] [drm] MTRR
allocation failed. Graphics performance may suffer.
Dec 15 16:10:51 teawater-workpc kernel: [ 12.958502] i915
0000:00:02.0: irq 42 for MSI/MSI-X
Dec 15 16:10:51 teawater-workpc kernel: [ 12.958806] vgaarb: device
changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
Dec 15 16:10:51 teawater-workpc kernel: [ 12.959124] [drm] initialized
overlay support
Dec 15 16:10:51 teawater-workpc kernel: [ 13.980020] No connectors
reported connected with modes
Dec 15 16:10:51 teawater-workpc kernel: [ 13.980025] [drm] Cannot find
any crtc or sizes - going 1024x768
Dec 15 16:10:51 teawater-workpc kernel: [ 13.986063] Console:
switching to colour frame buffer device 128x48
Dec 15 16:10:51 teawater-workpc kernel: [ 13.988296] fb0: inteldrmfb
frame buffer device
Dec 15 16:10:51 teawater-workpc kernel: [ 13.988298] drm: registered
panic notifier
Dec 15 16:10:51 teawater-workpc kernel: [ 13.988425] [drm] Initialized
i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

Thanks,
Hui


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