Hi all, I'd like to know what the current knowledge level is on desktops with Synergy switching technology. It is a solution for desktops which is called Optimus on laptops. I first encountered it with https://bugs.launchpad.net/lpbugreporter/+bug/752542/comments/466
These machines have the same _DSM UUID and function that is found on Optimus machines. This calls a NVOP function which is found on some machines as well. This Optimus UUID needs the next sequence on Optimus laptops for turning the device off: - _DSM ... - _PS3 After that, the PCI configuration space cannot be read anymore because the device is off (yielding all bits enabled, ff ff ff ...) On the desktop I've analyzed, this did not happen. # modprobe bbswitch Jan 12 01:05:40 vostro360 kernel: [ 1796.494370] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.P0P1.VGA_ Jan 12 01:05:40 vostro360 kernel: [ 1796.494845] bbswitch: detected an Optimus _DSM function Jan 12 01:05:40 vostro360 kernel: [ 1796.494853] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on # tee /proc/acpi/bbswitch <<<OFF Jan 12 01:07:06 vostro360 kernel: [ 1882.279130] bbswitch: disabling discrete graphics Jan 12 01:07:06 vostro360 kernel: [ 1882.279622] bbswitch: Result of Optimus _DSM call: 00000019 Jan 12 01:07:06 vostro360 kernel: [ 1882.299240] pci 0000:01:00.0: Refused to change power state, currently in D0 Jan 12 01:07:06 vostro360 kernel: [ 1882.299276] pci 0000:01:00.0: power state changed by ACPI to D3 $ cat /proc/acpi/bbswitch 0000:01:00.0 ON # tee /proc/acpi/bbswitch <<<OFF Jan 12 01:07:15 vostro360 kernel: [ 1891.686455] bbswitch: disabling discrete graphics Jan 12 01:07:15 vostro360 kernel: [ 1891.686923] bbswitch: Result of Optimus _DSM call: 00000019 Jan 12 01:07:15 vostro360 kernel: [ 1891.697091] pci 0000:01:00.0: power state changed by ACPI to D3 $ cat /proc/acpi/bbswitch 0000:01:00.0 ON If you have a Synergy machine, please submit your machine on https://bugs.launchpad.net/lpbugreporter/+bug/752542. If you've knowledge, please share it :) Regards, Lekensteyn
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