[Bug 105549] Black/blank screen at boot (last message line: fb: switching to inteldrmfb from EFI VGA) unless i915.modeset=0 is set

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105549

--- Comment #46 from Jani Nikula <jani.nikula at intel.com> ---
Thanks for the follow-up everyone.

Using the intel_vbt_decode tool on the VBT dumps here, I get the diff:

--- i915_vbt.1.1.9.txt  2018-04-18 10:36:39.221391894 +0300
+++ i915_vbt.1.2.3.txt  2018-04-18 10:36:48.840968824 +0300
@@ -3,7 +3,7 @@
        VBT version:            0x0064 (1.0)
        VBT header size:        0x0030 (48)
        VBT size:               0x1159 (4441)
-       VBT checksum:           0x9a
+       VBT checksum:           0x99
        BDB offset:             0x00000030 (48)

 BDB header:
@@ -126,7 +126,7 @@
                Port: 0x07 (DP-B)
                AIM I2C pin: 0x00
                AIM Slave address: 0x00
-               DDC pin: 0x01
+               DDC pin: 0x05
                EDID buffer ptr: 0x00
                DVO config: 0x00
                HPD sense invert: no
@@ -179,7 +179,7 @@
                Port: 0x08 (DP-C)
                AIM I2C pin: 0x00
                AIM Slave address: 0x00
-               DDC pin: 0x02
+               DDC pin: 0x04
                EDID buffer ptr: 0x00
                DVO config: 0x00
                HPD sense invert: no

We'll still carry the patch upstream of course; we better not oops on bogus VBT
data.

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