[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 #5 from shui yangwei <yangweix.shui at intel.com> ---
(In reply to comment #4)
> Yangwei, can you reproduce? I guess this is HSW laptop?

Environment:
---------------------
HW info: 
Acer Haswell Notebook Aspire V3 772G 17.3 ; 
Host bridge ID=0x0c04 (rev 06);
VGA ID=0x0416 (rev06);
CPU: i7-4702MQ 2.2GHz; 
BIOS:v1.04 MEM: 4G ;

drm-intel-next-queued kernel: 1acd12dc0d6a20f6bc7c6c7f2ef7119e15d3fe64

    drm/i915: Introduce an HAS_IPS() macro

    Follow the trend and don't code conditions with platforms but with
    features.

    Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

Test step:
---------------------
1. xrandr --output VGA1 --off
2. xrandr --output VGA1 --same-as HDMI1 --mode 1024x768

Description:
---------------------
I tried our HSW laptop VGA clone mode, it works well, and there's not "Call
Trace" in dmesg.

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