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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48652#c117">Comment # 117</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48652">bug 48652</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=48652#c107">comment #107</a>)
<span class="quote">> So, i tasted with latest git 3.10.0-rc7-00854-gf19c9d3 - same result.
>
> (gdb) l *intel_crtc_set_config+0x216
> 0x2bab0 is in intel_crtc_set_config
> (/home/lex/tmp/linux/drivers/gpu/drm/i915/intel_display.c:8678).
> 8673 int num_connectors)
> 8674 {
> 8675 int i;
> 8676
> 8677 for (i = 0; i < num_connectors; i++)
> 8678 if (connectors[i].encoder &&
> 8679 connectors[i].encoder->crtc == crtc &&
> 8680 connectors[i].dpms != DRM_MODE_DPMS_ON)
> 8681 return true;
> 8682
>
>
> I noticed that in some circumstances i null pointer dereference on xhci
> driver. Interesting, are these errors connected? Or may be there is some
> memory region used by what ever, bios, efi?</span >
This OOPS is fixed by
commit 2e57f47d317dd035b18634b0c602272529368fcc
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Wed Jul 17 12:14:40 2013 +0100
drm/i915: Fix dereferencing invalid connectors in is_crtc_connector_off()
In commit e3de42b68478a8c95dd27520e9adead2af9477a5
Author: Imre Deak <<a href="mailto:imre.deak@intel.com">imre.deak@intel.com</a>>
Date: Fri May 3 19:44:07 2013 +0200
drm/i915: force full modeset if the connector is in DPMS OFF mode
No idea why VT-d affects that at all.</pre>
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