running a motherboard without a keyboard

[Guylhem Aznar]

A similar question about dcon.

>From dmesg, it looks just fine.
$ dmesg|grep dcon
[   26.481778] olpc-dcon: No DCON found on SMBus
[   30.651493] olpc-dcon:  Discovered DCON version 2
[   30.708411] PM: Adding info for platform:dcon

But apparently dcon sleep, output and freeze also refuse to change. Is
the lack of screen causing the problem, and how?
The brightness can be disabled however.

$ cat /sys/devices/platform/dcon/sleep
0
$ echo 1 > /sys/devices/platform/dcon/sleep
$ cat /sys/devices/platform/dcon/sleep
0
$ cat /sys/class/backlight/dcon-bl/brightness
15
$ echo 0 > /sys/class/backlight/dcon-bl/brightness
$ cat /sys/class/backlight/dcon-bl/brightness
0

The only guess I have is i2c_smbus_write_word_data , called as
dcon_write from  dcon_sleep is not working as it should.