[Bug 86201] [VLV Bisected] Delayed boot and distorted text console after commit 773538e8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86201

--- Comment #9 from Egbert Eich <eich at pdx.freedesktop.org> ---
This issue is driving me nuts.

I've built drm-intel-nightly yesterday but unable to reproduce the issue - in
fact everything got initialized flawlessly. The patch in comment #6 didn't play
a role as
a. The long delay between calls to 
   intel_dp_init_panel_power_sequencer_registers() 
   did not exists.edp_panel_vdd_off_sync
b. edp_panel_vdd_off_sync() was called a lot less often.

In fact the only evidence I had that I was not dreaming last week when I
openend this ticket was the log in
https://bugs.freedesktop.org/attachment.cgi?id=109342
which clearly indicated that those issues existed in a kernel based on
3.18-rc4.

Comparing this log with the ones I generated yesterday revealed that the drm
modules were loaded a lot later during the boot process.
I've now been able to rebuild a kernel which exhibits this issue. I will now go
on comparing the configurations of the two builds.

So far it seems that for the 'bad' kernel build the patch in comment #6 at
least fixed the problem in the EDID read out which can be seen in
https://bugs.freedesktop.org/attachment.cgi?id=109342
as without it I can easily reproduce the bogus EDIDs.

So for now, let me figure out what is so different in the two builds of exactly
the same kernel version.

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