https://bugs.freedesktop.org/show_bug.cgi?id=81382
--- Comment #12 from Daniel Kirsten <daniel-kirsten-72 at excite.com> ---
(In reply to comment #11)
> I've got the same notebook as Daniel Kirsten,
They sold different Amilo Xi 2550, there are even some Amilo Xi 2550 with
an Nvidia graphic card.
> If I change /sys/class/backlight/radeon_bl0/brightness or
> /sys/class/backlight/acpi_video0 the display stayes dark.
I can control brightness by writing 0-7 into
/sys/class/backlight/acpi_video0/brightness
You should comment out lines 233-234 in
drivers/gpu/drm/radeon/atombios_encoders.c,
i.e.,
/* if (bd->props.brightness == 0)
234 bd->props.brightness = RADEON_MAX_BL_LEVEL; */
then it works.
Daniel
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