trident XP4m32 brightness change

Mathieu Lacage Mathieu.Lacage at
Sun Jul 22 06:39:05 PDT 2007


If, under X, I try to change the brightness of my laptop's lcd panel
with the following command:
echo "brightness: 1" > /proc/acpi/toshiba/lcd

the screen resolution changes abruptly: it switches from 1024x768 (the
panel's native resolution) to what I believe is 320x.... forcing a VT
switch back and forth brings back the old resolution with the new

Is there something which can be done to make the trident driver
synchronize with the kernel-level brightness change ? Or is just a bug
in my linux vesafb driver (which, I suspect, is responsible for
performing the brightness change once it is requested through acpi).


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