x220 notes

[Kostik Belousov]

On Tue, Oct 04, 2011 at 12:26:27PM -0700, matt wrote:
> On Tue, 4 Oct 2011 02:21:59 -0400 (EDT)
> Benjamin Kaduk <kaduk at MIT.EDU> wrote:
> 
> > On Mon, 3 Oct 2011, matt wrote:
> > 
> > > Ultimately, I think if we can set backlight, we can fix the screen
> > > after resume...I think it's just the backlight is low/off on
> > > resume...
> > 
> > Can you use a very strong fronglight to see if this is actually the
> > case? (Illumination angle may be important as well.)  The state of
> > the liquid crystal polarizing switches should be visible under
> > sufficient illumination, and whether they change with input would be
> > pretty definitive.
> > I actually used to operate my iBook G4 in "frontlight mode" in bright 
> > sunlight for a while (until the wifi card flaked out, tying it to my 
> > desk).
> > 
> > -Ben Kaduk
> 
> It's the IPS display, so there's a bit of glare...not much visible. I
> can't tell for sure...
> 
> Friend had idea of trying to resume under X with external
> VGA display...both remained off, however I am using the Intel GPU
> experimental drivers (To make a note, resume is broken without them as
> well).
Suspend/resume is not implemented in the KMS driver (yet).

> 
> I can't get vbetool from ports to do anything with the display other
> than cause it to turn off.
> 
> 
> I can type commands just fine under X or console with the display
> off...so I have tried xset, vbetool. hw.acpi.reset_video causes a
> majorly bad reboot loop on resume with a flashing thinklight.
> 
> Matt
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