[Bug 65757] [snb pch eDP regression] Screen sometimes remains black after mode change - old fast & narrow link is more stable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65757

--- Comment #5 from Egbert Eich <eich at pdx.freedesktop.org> ---
(In reply to comment #4)
> Quick thing to check on latest drm-intel-nightly, specifically
> 
> commit 8664281b64c457705db72fc60143d03827e75ca9
> Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Date:   Fri Apr 12 17:57:57 2013 -0300
> 
>     drm/i915: report Gen5+ CPU and PCH FIFO underruns

Will do that.

> 
> Do the fifo underrun reports fire up?
> 
> Also, as discussed in the meeting can you please test what happens when you
> set the panel to eDP? Without that we also set up the HDMI connector, and
> the i2c probing over HDMI is known to kill some eDP panels ...

When setting the panel eDP it will work: reason is that the bogus VBT eDP
tables in the BIOS will mark the panel 1 lane and 18bpp, thus the frequency low
enough that only a single lane is used.
I will however disable the HDMI connector setup and the I2C probing on the eDP
connector hacking the driver and see if this makes a difference.

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