Not sure if it helps. I have X1 Carbon 1st generation. What I did was recompile 
the kernel without vesa driver since the 11-current. And I am able to resume 
successful without the reset.video=1 even now with 11-RC2 I still ok. 

Best regards,
Chan


> On 9 Sep 2016, at 8:10 AM, Adrian Chadd <adrian.ch...@gmail.com> wrote:
> 
> Try forcing a console switch - hit alt-f1, alt-f2, etc.
> 
> 
> -a
> 
> 
>> On 8 September 2016 at 15:10, Glen Barber <g...@freebsd.org> wrote:
>>> On Thu, Sep 08, 2016 at 11:32:24PM +0200, Philip Homburg wrote:
>>> The main culprit seems to be putting 'hw.acpi.reset_video=1' in
>>> /boot/loader.conf
>> 
>> Yes, I have seen this cause problems on some (not all) hardware.
>> 
>>> this causes resume to hang half way through. I managed to trigger
>>> CMOS corruption once, but I can't systematically trigger it.
>>> 
>>> Without hw.acpi.reset_video=1 in /boot/loader.conf, resume works except that
>>> the screen stays black.
>> 
>> What graphics driver are you using?
>> 
>> Glen
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