Confirm on intel G45 using latest karmic bits as of 29th Aug (have seen the 
error on every boot for more than a month now):
[    1.933896] [drm:intel_dp_i2c_init] *ERROR* i2c_init DPDDC-B
[    1.944881] [drm:intel_dp_i2c_init] *ERROR* i2c_init DPDDC-C

The dmesg just before those errors are:
[    1.901688] agpgart-intel 0000:00:00.0: Intel G45/G43 Chipset
[    1.903191] agpgart-intel 0000:00:00.0: detected 32764K stolen memory
[    1.906008] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xd0000000
[    1.918992] [drm] Initialized drm 1.1.0 20060810
[    1.925547] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    1.925551] i915 0000:00:02.0: setting latency timer to 64
[    1.928312] mtrr: type mismatch for d0000000,10000000 old: write-back new: 
write-combining
[    1.928314] [drm] MTRR allocation failed.  Graphics performance may suffer.
[    1.928524]   alloc irq_desc for 26 on node 0
[    1.928526]   alloc kstat_irqs on node 0
[    1.928532] i915 0000:00:02.0: irq 26 for MSI/MSI-X
[    1.933896] [drm:intel_dp_i2c_init] *ERROR* i2c_init DPDDC-B
[    1.944881] [drm:intel_dp_i2c_init] *ERROR* i2c_init DPDDC-C
[    1.972387] i2c-adapter i2c-1: unable to read EDID block.
[    1.972389] i915 0000:00:02.0: DVI-D-1: no EDID data

Card:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset 
Integrated Graphics Controller [8086:2e22] (rev 03)

2D:
2:2.8.1-1ubuntu1

libdrm-intel1:
2.4.12+git20090801.45078630-0ubuntu1

---

I assume that the "DP" in intel_dp_i2c_init] means DisplayPort? I've got
my SyncMaster 2253BW connected through DVI though.

-- 
Seeing drm:intel_dp_i2c_init errors on boot
https://bugs.launchpad.net/bugs/409361
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