[Bug 65927] [HSW] crash when vga output set to mirror mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65927

--- Comment #8 from Timo Aaltonen <tjaalton at ubuntu.com> ---
ok got something, although again not the same trace as originally:

[   63.226349] Call Trace:
[   63.226361]  [<ffffffff8134d1e9>] ? snprintf+0x39/0x40
[   63.226388]  [<ffffffffa032d7dd>] drm_mode_set_config_internal+0x5d/0xe
0 [drm]
[   63.226416]  [<ffffffffa032feeb>] drm_mode_setcrtc+0xfb/0x600 [drm]
[   63.226437]  [<ffffffff816e233d>] ? mutex_lock+0x1d/0x41
[   63.226458]  [<ffffffffa0320529>] drm_ioctl+0x539/0x670 [drm]
[   63.226481]  [<ffffffffa032fdf0>] ? drm_mode_setplane+0x3b0/0x3b0 [drm]
[   63.226503]  [<ffffffff811a8877>] do_vfs_ioctl+0x97/0x560
[   63.226521]  [<ffffffff8108fed4>] ? vtime_account_user+0x74/0x90
[   63.226540]  [<ffffffff811a8dd1>] SyS_ioctl+0x91/0xb0
[   63.226557]  [<ffffffff816ee82f>] tracesys+0xe1/0xe6
[   63.226572] Code: c0 48 8b 7d c0 48 8d 72 01 48 69 f6 50 05 00 00 eb 0c
 90 48 05 50 05 00 00 48 39 f0 74 2d 48 8b 94 01 a0 04 00 00 48 85 d2 74 e8
<48> 3b 7a 38 75 e2 8b 94 01 84 04 00 00 85 d2 75 3
9 48 05 50 05 
[   63.228974] RIP  [<ffffffffa03d8f18>] intel_crtc_set_config+0x218/0x970
[i915]

so checking 'intel_crtc_set_config+0x218' from i915.ko gives:

8545                          int num_connectors)
8546    {
8547            int i;
8548
8549            for (i = 0; i < num_connectors; i++)
8550                    if (connectors[i].encoder &&
8551                        connectors[i].encoder->crtc == crtc &&
8552                        connectors[i].dpms != DRM_MODE_DPMS_ON)
8553                            return true;
8554

HEAD at 8bbbb45b2125a28ea1de657e7893a521b44b60c3

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