Been trying to learn ACPI via the acpi_call kernel module. I experimented with the DSDT.dsl output, and found two commands that brighten and darken the laptop LCD. (Asus U43JC Ubuntu 10.10 RC 64bit)
echo "\_SB.PCI0.RP00.VGA.UPBL" > /proc/acpi/call echo "\_SB.PCI0.RP00.VGA.DWBL" > /proc/acpi/call I've not found anything else useful. (Well, something messed up my laptop enough to prevent it from turning back on. I had to remove the battery and power before it would power up again. :( ) Nor do I seem to be able to pass parameters. According to the acpi_call source code, I should be able to pass integers or hex integers separated by spaces. i.e. echo "\_SB.PCI0.RP00.VGA.DWBL 0x00" > /proc/acpi/call but this always fails. The DSDT tells how many parameters its expecting on the Method line: Method (_FUN, 1, Serialized) Scope seems to define the ACPI tree the Method works in. Scope (\_SB.PCI0.VGA) Anyway, still learning ACPI, would like to experiment more, but am not succeeding in passing parameters to acpi_call Am I missing something or doing it wrong? Thanks, Abe
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