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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#c6">Comment # 6</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:sassmann@redhat.com" title="sassmann@redhat.com">sassmann@redhat.com</a>
</span></b>
<pre>(In reply to Dhinakaran Pandiyan from <a href="show_bug.cgi?id=102022#c5">comment #5</a>)
<span class="quote">> (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?</span >
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.
<span class="quote">> What was the display input switch that caused this?</span >
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.
<span class="quote">> What was the DP mode in the monitor at that time?</span >
Setting monitor to DP 1.1 and DP 1.2 both show the problem.
<span class="quote">> How did you switch the display input?</span >
Via monitor on-screen menu.
<span class="quote">> Does this happen if you don't force the mode from cmdline?</span >
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 class="quote">> Can you please try this hack?</span >
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.</pre>
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