I hope the darkest level won't be too bright either. I see darker level
when writing 1 via sysfs then it is possible via gui. When writing 2 it
is same level as possible with GUI. But when writing 2 via sysfs it
immediatelly returns 1 on read (and the brightness is same). I'll try
the ioctl too. Thank you.
Frantisek
Arnaud Patard (Rtp) wrote:
after looking at the kernel sources, you have 2 ways of setting the PWM
value for the backlight :
- through sysfs
- through /dev/tavho with an ioctl (look at the tahvo-user.c and tahvo.h
files in the kernel).
If you use the first method, you're have to cope with a scale factor eg
when you write 1, you'll write 1*0x7f/0x0f=0x08. This is also happening
when you read the file.
If you use the second method, you may write an arbitrary value for the
pwm. This is probably how is working the gui. This is why 1 with the gui
is not the same 1 as with sysfs.
If you try to set the level with the ioctl, to something like 1, you'll
get a darker screen as expected but it'll go a few sec later to the gui
setting.
I hope that this helps you :)
Arnaud
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