If the BIOS is enabling ASPM on a port, despite claiming not to support it, should we consider keeping it enabled?
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A Comment On The Linux 2.6.38 Power Regression
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Originally posted by phoronixTomorrow is a look at the Catalyst vs. Radeon DRM/KMS power consumption in different power management modes.
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Code:Jun 27 19:01:51 smorg kernel: [ 0.912182] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912293] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P1._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912322] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P4._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912336] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P6._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912350] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P8._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912367] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.NPE1._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912380] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.NPE3._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912393] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.NPE7._PRT] Jun 27 19:01:51 smorg kernel: [ 0.912409] pci0000:00: Requesting ACPI _OSC control (0x1d) [b]Jun 27 19:01:51 smorg kernel: [ 0.912435] Unable to assume _OSC PCIe control. Disabling ASPM[/b] Jun 27 19:01:51 smorg kernel: [ 0.918144] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 6 7 10 *11 12 14 15) Jun 27 19:01:51 smorg kernel: [ 0.918309] ACPI: PCI Interrupt Link [LNKB] (IRQs *5) Jun 27 19:01:51 smorg kernel: [ 0.918386] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 6 7 *10 11 12 14 15) Jun 27 19:01:51 smorg kernel: [ 0.918549] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 6 7 10 11 12 *14 15) Jun 27 19:01:51 smorg kernel: [ 0.919238] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 6 7 10 11 12 14 *15) Jun 27 19:01:51 smorg kernel: [ 0.919401] ACPI: PCI Interrupt Link [LNKF] (IRQs *3 4 6 7 10 11 12 14 15) Jun 27 19:01:51 smorg kernel: [ 0.919562] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 6 *7 10 11 12 14 15) Jun 27 19:01:51 smorg kernel: [ 0.919724] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 *4 6 7 10 11 12 14 15)
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Originally posted by Smorg View PostCode:Jun 27 19:01:51 smorg kernel: [ 0.912409] pci0000:00: Requesting ACPI _OSC control (0x1d) [b]Jun 27 19:01:51 smorg kernel: [ 0.912435] Unable to assume _OSC PCIe control. Disabling ASPM[/b]
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But how does Windows know when to enable ASPM? Do hardware manufacturers put that into their drivers?
Maybe we should make a whitelist of ASPM-compatible devices that will always be forced to use ASPM, even when the BIOS doesn't advertise it.
What about putting a script on internet that uploads ASPM data from computers with a proper BIOS (yes, they exist !)?
Then volunteers from all over the world can, without too much technical knowledge, send their ASPM data. And then it can be put into the kernel.Last edited by AlbertP; 28 June 2011, 06:06 AM.
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Until drivers are updated...
You can do things to help:
- test your system with ASPM forced on (see previous articles on that)
- test each device to make sure it operates properly after given time to transition into different ASPM states
Assuming things work well for you, ping the appropriate driver maintainers for the devices in your system indicating that ASPM can safely be enabled for your devices (ideally with patches attached; see the e1000e driver for examples of how a driver can configure ASPM directly).
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Originally posted by jbarnes View PostYou can do things to help:
- test each device to make sure it operates properly after given time to transition into different ASPM states
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Originally posted by jbarnes View PostYes, if you set the force option, you can ignore this message.
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Originally posted by jbarnes View PostYes, if you set the force option, you can ignore this message.
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