Comment 138 for bug 946311

(In reply to comment #107)
> 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?

This OOPS is fixed by

commit 2e57f47d317dd035b18634b0c602272529368fcc
Author: Chris Wilson <email address hidden>
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 <email address hidden>
    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.