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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW] i915: null pointer in intel_dp_max_link_rate+0x5/0x80"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102022#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW] i915: null pointer in intel_dp_max_link_rate+0x5/0x80"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102022">bug 102022</a>
from <span class="vcard"><a class="email" href="mailto:dhinakaran.pandiyan@intel.com" title="Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>"> <span class="fn">Dhinakaran Pandiyan</span></a>
</span></b>
<pre>(In reply to sassmann from <a href="show_bug.cgi?id=102022#c6">comment #6</a>)
<span class="quote">> (In reply to Dhinakaran Pandiyan from <a href="show_bug.cgi?id=102022#c5">comment #5</a>)
> > (In reply to sassmann from <a href="show_bug.cgi?id=102022#c0">comment #0</a>)
> > > After switching display inputs on the monitor (Dell U3415W) the screen
> > > wouldn't come back from standby. Reproduced this with drm-tip
> >
> > Thanks for filing this bug.
> >
> > Can you please describe this a bit more in detail?
>
> Sure, same setup as in <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [DP] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up"
href="show_bug.cgi?id=90963">bug #90963</a>.
> Lenovo w541 docked in ThinkPad Dock with lid close (permanently).
> Dell U3415W display connected via DP as the only display.
>
> > What was the display input switch that caused this?
>
> The Monitor has 2 DP inputs. Switching input from the DP1, the w541 is
> connected to, to the other DP and back is sufficient to cause this problem.
>
> > What was the DP mode in the monitor at that time?
>
> Setting monitor to DP 1.1 and DP 1.2 both show the problem.
>
> > How did you switch the display input?
>
> Via monitor on-screen menu.
>
> > Does this happen if you don't force the mode from cmdline?
>
> That helps, I can switch DP inputs now without a crash! I had to force
> monitor input at some point as otherwise the external monitor wouldn't get
> detected. Now it seems to work better, so I probably can remove that quirk.
> </span >
Great! I think the problem is with the user space forcing a mode non-sink
connectors.
<span class="quote">> > Can you please try this hack?
>
> Already tried the patch from <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [DP] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up"
href="show_bug.cgi?id=90963">bug #90963</a>, didn't help with this.</span ></pre>
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