Comment # 12
on bug 81382
from Daniel Kirsten
(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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