[Bug 28671] Seg. fault and Oops with Radeon KMS (v2.6.34) on PPC ATI Radeon AGP r420 JH.

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https://bugs.freedesktop.org/show_bug.cgi?id=28671

--- Comment #18 from Alex Deucher <agd5f@xxxxxxxxx> 2010-06-27 15:35:36 PDT ---
(In reply to comment #17)
> I thought that was the case. We have two connectors now, but no input to the
> monitor (atleast on the DVI-D output). So our controllers and ddc lines must be
> wrong?

If no monitor is getting detected, the ddc lines are probably wrong.  In the
patch edit these two lines:

+        /* DVI - primary dac, dvo */
+        ddc_i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_DVI_DDC);

+        /* DVI - tv dac, internal tmds */
+        ddc_i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_MONID);

Make sure they are not the same value.  Try combinations the following values:

RADEON_GPIO_VGA_DDC
RADEON_GPIO_DVI_DDC
RADEON_GPIO_CRT2_DDC
RADEON_GPIO_MONID

When you get the right one, you should get an edid from your monitor assuming
it has one.

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