Every time I execute this in the /sys/class/backlight/samsung directory:
sudo bash -c 'echo 1 > brightness'
brightness is reduced a little until it reaches the minimum.
After that, every time I execute this:
sudo bash -c 'echo 8 > brightness'
it increases a little until it reaches the maximum.
And each time a message appears in dmesg: "ACPI: Failed to switch the
brightness", until the brightness stops changing.
At the same time, the little Gnome brightness adjustment window appears,
showing the percentage of the brightness, which drops/raises to
minimum/maximum in only four executions of these commands. After that,
while
brightness drops/raises with each execution, the percentage stays at
minimum/maximum.
Is this all normal?
That sounds like the driver is interfering with the ACPI video driver.
Add "acpi_backlight=vendor" to your kernel boot parameters and try again.
--
Regards,
Richard Schütz
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