Hi Eric,
I'm attaching my notes for digging in my own tables as well as the
disassembled tables you sent me before.
The TableID of SSDT5.dsl is OptTabl (OptimusTable?) and the methods and
devices in it suggests that it is relevant.
A quick overview on that views revealed some interesting methods:
- \_SB.PCI0.PEG0.PEGP._DSM calls \_SB.PCI0.GFX0.HDSM (Arg0, Arg1, Arg2,
Arg3) and returns the return value from that method
- \_SB.PCI0.GFX0.HDSM
If arg 0 equals to the buffer
0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 0xA7, 0x2B, 0x60, 0x42,
0xA6, 0xB5, 0xBE, 0xE0
then OPCI becomes One.
If OPCI is One OR if SGCI or NBCI are One (which is never the case), the
next continues:
If arg1 (the revision number) does not equal 0x100 0x80000002 is returned
(which is btw the value returned on errors).
Arg 2 is the function, func 0 returns a 4-byte buffer depending on some
register values
func 1 returns a buffer with four 0x0 (in this case)
... there are other methods but I'm not going to analyse all of them for
now..
func 0x03 is what we're looking for.
Arg3 is converted to an integer, taking the first 8 bytes of the buffer as
an integer (forming a 64-bit one). On that integer, the least two bits are
significant.
if it's 0, \_SB.PCI0.PEG0.PEGP.SGST is called (status?),
if it's 1, \_SB.PCI0.PEG0.PEGP.SGON is called (turn something on?),
if it's 2, \_SB.PCI0.PEG0.PEGP.SGOFF is called (turn sth. off?)
After that, if the result of \_SB.PCI0.PEG0.PEGP.SGST equals 0x0F, a buffer
of 0x0, 0x2, 0x0, 0x0 is returned. Otherwise, a buffer of 4 zeros is
returned.
The method becomes:
\_SB.PCI0.PEG0.PEGP._DSM
{0xF8,0xD8,0x86,0xA4,0xDA,0x0B,0x1B,0x47,0xA7,0x2B,0x60,0x42,0xA6,0xB5,0xBE,0xE0}
0x100 0x3 {0x00,0x00,0x0,0x1}
The above is for turning it n, replace the last 0x1 by 0x2 for turning it
off (theoretically)
Some methods may return a Package as result ("Object type 0x4"). If you
encounter that, use acpi_call from
https://github.com/Bumblebee-Project/acpi_call. I'll soon make it available
in the bumblebee/testing PPA.
I wish there was a register/ method documentation somewhere, that would help
a lot with analysing.
Regards,
Lekensteyn
On Sun, Oct 23, 2011 at 5:56 AM, Eric Appleman<erappleman@xxxxxxxxx> wrote:
Consult the following for background and logs:
https://github.com/Bumblebee-Project/Bumblebee/issues/133
Is there anyone here who is well-versed in ACPI who'd be willing to look
at my tables as well as those of similarly arranged machines?
Thanks in advance.
- Eric Appleman, Bumblebee Project
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