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03-20-2010, 05:44 PM
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Cheetah
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Join Date: Mar 2010
Posts: 5
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Quote:
Originally Posted by uman
My bad. I'm so used to SD cards not working, that I assumed you meant SSD.
You could try the following:
1. Determine what USB slot your SD card is occupying. Easiest is to highlight he drive in disk utility and right-click Information. You should see something like: IODeviceTree:/PCI0@0/USB7@1D,7. That tells me that it's using USB7.
2. Edit your DSDT to replace the _PRW for the indicated USB slot with:
Code:
Device (USB7)
{
...
// package (argnum) {GPEbit, Wakelevel, PowerResource}
Name(_PRW, Package()
{
<xx>, // Bit number in GPEx_EN to enable USB resume
0x01 // Reference to lowest sleeping state which can be
// entered while still providing wake functionality
// no relative power resource specified
})
where I have <xx> above, keep your DSDT's existing value, as that's the handler in the GPE for USB7. What I've highlighted in red is the change. Your existing DSDT likely has 0x03, which is effectively powered off.
What the 0x01 does is says that the drive still needs power. That *might* be enough to keep it from being ejected. But it might also prevent the computer from sleeping.
Take a look at the ACPI spec (4.0 rev) Chapter 7.2 for some of the things you can do with power management. |
Hello,
Thanks a lot. In the disk utility I got: /PCI0@0/EUSB@1D,7
And in the DSDT file, at Device(EUSB) I don't have a lot of things. Just
{
Name (_ADR, 0x001D0007)
}
nothing else. Any idea what else I can add to make it working in that case ?
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