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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BYT Regression]eDP shows black screen while testing testdisplay -f 38.25,800,832,912,1024,600,603,607,624"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72752#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BYT Regression]eDP shows black screen while testing testdisplay -f 38.25,800,832,912,1024,600,603,607,624"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72752">bug 72752</a>
from <span class="vcard"><a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> <span class="fn">Paulo Zanoni</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=72752#c4">comment #4</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=72752#c3">comment #3</a>)
> > After bisect, We found first bad point on -next-queued branch
> > commit dff392dbd258381a6c3164f38420593f2d291e3b
> > Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
> > Date: Fri Dec 6 17:32:41 2013 -0200
> >
> > drm/i915: don't touch the VDD when disabling the panel
> >
> > I don't see a reason to touch VDD when we're disabling the panel:
> > since the panel is enabled, we don't need VDD. This saves a few sleep
> > calls from the vdd_on and vdd_off functions at every modeset.
> >
> > Bugzilla: <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BYT]igt/kms_flip: DP link train fail due to IOSF sideband fabric timeout"
href="show_bug.cgi?id=69693">https://bugs.freedesktop.org/show_bug.cgi?id=69693</a>
> > Reviewed-by: Rodrigo Vivi <<a href="mailto:rodrigo.vivi@gmail.com">rodrigo.vivi@gmail.com</a>>
> > Signed-off-by: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
> > [danvet: Fix the patch mangle wiggle has done ... Spotted by Paulo.
> > Also drop the runtime_pm_put call which now has to go due to different
> > patch ordering. Also from Paul.]
> > Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
> >
> > Reverted this commit, the bug unable to reproduce.
>
> I suggest we revert that and reopen <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BYT]igt/kms_flip: DP link train fail due to IOSF sideband fabric timeout"
href="show_bug.cgi?id=69693">bug 69693</a>. Assigning to Paulo.</span >
According to the spec, we should be doing the correct thing now, so I'm in
favor of spending a little bit of time on the proper fix before we decide to
revert. But I don't have a BYT machine, so if someone wants to help, please :)
There's also the possibility of doing a BYT-revert-only or a
ILK-SNB-IVB-BYT-revert-only (leaving HSW+ untouched).</pre>
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