Black Display after suspend/resume on Thinkpad X201 with 8.1/amd64

David DEMELIER demelier.david at
Mon Aug 16 10:09:16 UTC 2010

2010/8/8 Bruce Cran <bruce at>:
> On Sat, 07 Aug 2010 02:30:13 -0700 (PDT)
> "" < at> wrote:
>> The current situation is that the machine will suspend using
>> acpiconf -s 3 and it will also resume. The problem is that the LCD
>> display does not resume correctly after suspend - instead it just
>> stays black. I've been randomly tweaking various things, and get
>> slightly different results. Sometimes the display stays black in the
>> sense the display is still completely switched off. Othertimes, I
>> think the display switches on, but nothing is displayed, so that the
>> display is on but showing nothing except a black background. However,
>> I can still type blind and e.g. shutdown/restart the machine.
> I'm having the same problem with a Dell XPS M1530 and 9-CURRENT - the
> display refuses to switch on after resuming. I've tried
> hw.acpi.reset_video, switching consoles using vidcontrol and using the
> acpi_video module: setting the reset_video sysctl causes the machine to
> reboot during resume, and toggling just
> produces a beep with no change in the LCD status (it works before
> suspend).
> suggests that
> on a different XPS machine with Linux the VESA BIOS Extensions shouldn't
> be saved/restored - is there a way to try disabling that on FreeBSD?
> --
> Bruce Cran
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It seems that -CURRENT make my laptop suspend/resume correctly. Before
when I was resuming, I canno't do anything even shutdown didn't work
(probably panic) here it seems that the screen still stays black but I
can shutdown, probably it will works soon :-)

Demelier David

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