https://bugzilla.kernel.org/show_bug.cgi?id=15204
--- Comment #43 from John <infynidybusine...@yahoo.com> 2010-06-24 03:45:37 ---
Dear Zhang,
No luck. I cannot change the brightness at all now. Here is what I did..
Compiled kernel version 2.6.34 with the following options.
CONFIG_ACPI_DEBUG=y
CONFIG_STANDALONE=n
CONFIG_ACPI_CUSTOM_DSDT=y
CONFIG_ACPI_CUSTOM_DSDT_FILE="DSDT.hex"
I made sure DSDT.hex was in /usr/src/linux-2.6.34/include/, before compiling.
Reboot.
I mounted the debugfs via ("mount -t debugfs none /sys/kernel/debug").
Then I downloaded the latest DSDT.aml file and cat it via "cat IBCM.aml >
/sys/kernel/debug/acpi/custom_method".
Tried to change brightness via FN+down(same key I used to lower the brightess
in the previous attempt), without luck. I attached the latest dmesg, I boot
with "acpi.debug_level=0x2002 acpi.debug_layer=0xffffffff
log_buf_len=1M" in case there was more debug information. I attached the latest
dmesg in case of changes.
p.s, you were right, i compiled without CONFIG_ACPI_DEBUG last time ;P.
Thank you very much for your support.
(In reply to comment #42)
> (In reply to comment #40)
> > Dear Zhang,
> >
> > I have tried to redo the test with the DSDT.aml
>
> no no, you can not cat DSDT.aml to /sys/kernel/debug/acpi/custom_method.
>
> > but the acpi directory
> > in /sys/kernel/debug/ has disappeared.
>
> Maybe you forgot to mount debugfs ("mount -t debugfs none /sys/kernel/debug")
> Or maybe you forgot to set CONFIG_ACPI_DEBUG, ;p
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