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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [snb pch eDP regression] Screen sometimes remains black after mode change - old fast & narrow link is more stable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65757#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [snb pch eDP regression] Screen sometimes remains black after mode change - old fast & narrow link is more stable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65757">bug 65757</a>
from <span class="vcard"><a class="email" href="mailto:eich@pdx.freedesktop.org" title="Egbert Eich <eich@pdx.freedesktop.org>"> <span class="fn">Egbert Eich</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=65757#c5">comment #5</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=65757#c4">comment #4</a>)
> > Quick thing to check on latest drm-intel-nightly, specifically
> >
> > commit 8664281b64c457705db72fc60143d03827e75ca9
> > Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
> > 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?</span >
I do not see anything there. The only message regarding underruns is for
pipe underruns as quoted by Michal in the original report.
<span class="quote">> >
> > 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.</span >
I disabled HDMI initialization for testing by returning early from
intel_hdmi_init() ie:
@@ -1073,6 +1073,8 @@ void intel_hdmi_init(struct drm_device *dev, int
hdmi_reg,
enum port port)
struct drm_encoder *encoder;
struct intel_connector *intel_connector;
+ return;
+
intel_dig_port = kzalloc(sizeof(struct intel_digital_port),
GFP_KERNEL);
unfortunately the problem still occurs.</pre>
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