acpi_video on SONY VAIO PCG-Z1 [was: acpi_video users needed]

[Vladimir Grebenschikov]

On Wed, 2004-09-01 at 19:25 +0900, takawata at jp.freebsd.org wrote:
> In message <1094031813.903.13.camel at localhost>, Vladimir Grebenschikov wrote:
> >On Wed, 2004-09-01 at 12:43 +0400, Toxa wrote:
> >> On Wed, Sep 01, 2004 at 11:38:57AM +0900, takawata at jp.freebsd.org wrote:
> >> 
> >> > I don't imagine why. But any other method in SNC may do something.
> >> > I modified the driver so that it exports more methods.
> >> > http://www.init-main.com/acpi_snc2.tar.gz
> >> 
> >> > Testers wanted.
> >> 
> >> sony vaio pcg-v505bx...
> >
> >sony vzio pcg-z1aw
> >
> >almost same:
> >
> ># sysctl dev.acpi_snc
> >dev.acpi_snc.0.brightness: 98
> >dev.acpi_snc.0.ctr: 0
> >dev.acpi_snc.0.pcr: 0
> >dev.acpi_snc.0.cmi: -1044294180
> >dev.acpi_snc.0.wdp: 1281
> >dev.acpi_snc.0.cdp: 1
> >dev.acpi_snc.0.%desc: Sony notebook controller
> >dev.acpi_snc.0.%driver: acpi_snc
> >dev.acpi_snc.0.%location: handle=\_SB_.PCI0.LPCB.SNC_
> >dev.acpi_snc.0.%pnpinfo: _HID=SNY5001 _UID=0
> >dev.acpi_snc.0.%parent: acpi0
> ># 
> >
> >dmesg message appears:
> >    ACPI-1303: *** Error: Method execution failed [\
> >\_SB_.PCI0.LPCB.SNC_.GCMI] (Node 0xc1a3a6a0), AE_AML_UNINITIALIZED_ARG
> >
> >
> >on each 
> ># sysctl dev.acpi_snc.0.cmi
> 
> This value should not exported in this way, it seems.
> Please comment out the entry in the array for defining sysctl value.
> 
> >value of 
> >dev.acpi_snc.0.brightness
> >change real brightness of screen but by very strange law:
> >
> ># i=1; while [ $i -le 100 ]; do echo "try $i"; sysctl
> >dev.acpi_snc.0.brightness=$i; echo -n 'read value '; setbrightness --
> >read; i=$(($i+1)); done
> >read value 248
> 
> (snip)
> 
> >Real display brightness changed according "read value %d", so while this
> >operations screen brightness was jumping.
> 
> setbritness is dangerous with this driver, because it use same register
> without locking.

yes, i am use it only for reference

> How about real   change?

real brightness correspond values reported by 'brightness --read'

so sequential setbrightness with increasing values  (1 - 255) - gives
expected thing - brightness changed from low to high.

If I do same thing with dev.acpi_snc.0.brightness - real brightness
jumps, see values in my previous post, "read" value for corresponds
physical screen brightness (in range 255 means 100%)

-- 
Vladimir B. Grebenchikov
vova at fbsd.ru