Re: x220 notes

I will be buying a X220 soon and have some questions:

1. Which wireless has better support?

ThinkPad 11b/g/n Wireless (Realtek RTL8192SE / RTL8188CE)
Intel Centrino Wireless-N 1000

2. I've read bad reviews about webcam having poor quality on GNU/Linux, so
I would assume it will be the same on FreeBSD with webcamd and not worth
the $30? (which also frees up space for 3x3 antenna)

3. Any disadvantages in usage for turning off the UEFI?

4. How far is the AMD64 kernel suspend/resume? What do you mean by video
doesn't resume?

5. I'll be getting the IPS screen and want to make sure all the brightness
issues won't f it up. Is there yet a working way to control brightness
without interrupting the fan?

Cheers.

2012/2/18 matt <sendtomatt_at_gmail.com>

> I got 10-CURRENT installed on the x220 again.
>
> 1. Standard GENERIC kernel
> 2. Buildworld/installworld from today's CVS
> 3. No DRM/KMS patches or any other "factors"
> 4. Witness KDB disabled in loader.conf (otherwise panic on suspend).
> 5. setting hw.pci.do_power_suspend=0 wil prevent some AE_NO_METHOD
> errors where it tries to set PCI express ports to D2 (the ports
> themselves, I think...not the attached device)
>
> This is what I've found as I investigate the backlight/resume issue. I
> am not very good at understanding ASL, but here's what I see.
>
> 1. _WAK calls a number of display related methods
> 2. There are apparently brightness related calls here, as well as some
> other video related calls
> 3. Some of this behavior depends on /VIGD, whatever that is.
> 4. The brightness calls seem to connect over LPC to the embedded controller
> 5. Some of the brightness methods check OSI for WIN7
>
> I will add that iasl finds 35 errors in this fine piece of lenovo work.
> However, none of the errors appear to be near _wak. I've attached an
> acpidump asl if it helps anyone who has a better eye for ASL and
> resume/brightness problems. I think we can control brightness at least
> with acpi_video, it attaches but not correctly..."active=0"...I haven't
> gone back over its source in comparison with ASL yet either. Probably
> acpi_ibm will work also, as the acpi methods seem to just call the
> embedded controller over the lpc bus? Unfortunately it seems something
> has changed with the ec, as some of the data becomes corrupt when
> acpi_ibm is loaded.
>
> Resume obviously works fine in Win7, works 80-95% of the time in Linux
> (seems like KMS fail when it doesn't resume on Linux), and it resumes
> fine on FreeBSD except no video. No bad messages in logs after resume.
>
> Matt
>
>
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-- 
Lyubomir Grigorov (bgalakazam)