brightness control stopped working

[aeuii at posteo.de]

> On 27/10/15 22:32, aeuii at posteo.de wrote:
> > Hello freebsd-acpi@,
> >
> > I have lenovo ThinkPad Edge E145 laptop and the LCD brightness control
> > stopped working somewhere between 10.2-RELEASE and 10.2-RELEASE-p6.
> >
> > I used to adjust the brightness using Fn-☼- and Fn-☼+ buttons and it
> > always worked (during boot, in X, text console).  Now, it works only
> > in the loader, before the system boots.
> >
> > I tried alternative methods listed below, but non had any effect.
> >
> > Please help! ;)
> >
> > Thank you in advance,
> > Stefan
> >
> >
> > ** acpi_call
> >
> > acpi_call -v -p '\VBRU'
> >
> > Path: \VBRU
> > Number of arguments: 0
> > ioctl: Device not configured
> >
> > no effect

> Is the acpi_call kernel module loaded?

yes


> > ** acpi_ibm
> >
> > sysctl dev.acpi_ibm.0.lcd_brightness=7
> >
> > values change, but no effect
> >
> >
> > ** acpi_video
> >
> > sysctl hw.acpi.video.lcd0.brightness=50
> > hw.acpi.video.lcd0.brightness: 50 -> #
> >
> > no effect
> >
> >
> > pressing Fn+(sun)+- buttons has no effect, but logs:
> >
> > can't evaluate \134_SB_.PCI0.VGA_.LCD_._BQC - AE_NOT_FOUND
> If the buttons generate events for devd you can execute whatever
> commands work for you. `cat /var/run/devd.pipe` logs all events consumed
> by devd from /dev/devctl. If the acpi_ibm module generates events for
> the function keys the output of said command will log them. The
> key-value pairs contain all the information needed to write matching
> event handlers in devd.conf.

`cat /var/run/devd.pipe` does not log any brightness related events.
Even if it did, I not able to change the LCD brightness in any way after
the kernel is loaded.


> Did you try xbacklight? The changes between 10.2-RELEASE and
> 10.2-RELEASE-p6 shouldn't break your backligh controls. However lots of
> ports changed in that timeframe and maybe one of those changes e.g. a
> X.org driver update caused your problem.

I realized that the problem could have occured between 10.1 and 10.2.
But I do not think it is port related, because previously I was able to
change the brightness with keyboard buttons during any stage of the boot
process and afterwards (with and without X).