Hello Jeff, my wife's ACER Aspire 5550 notebook has a ICH7 controller which is eternally in "legacy" mode - the crippled BIOS is doesn't offer any option to switch it to AHCI mode. It's basically running fine using the ata_piix driver, but it never comes out of resume, only the hard disk LED lights up and stays that way. lspci -v: 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02) (prog-if 80 [Master]) Subsystem: Acer Incorporated [ALI] Unknown device 0108 Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 19 I/O ports at 01f0 [size=8] I/O ports at 03f4 [size=1] I/O ports at 0170 [size=8] I/O ports at 0374 [size=1] I/O ports at 18b0 [size=16] Capabilities: [70] Power Management version 2 Kernel driver in use: ata_piix lspci -n: 00:1f.2 0101: 8086:27c4 (rev 02) I thought about switching the controller to AHCI mode to try suspend with the ahci driver, and according to the Intel ICH7 spec, section 12.1.33, there's a single register (MAP) which controls the operating mode of the chipset. So, what I thought about is basically this: - patch the ata_piix driver to switch the MAP register and un-claim the device - hope that the ahci driver then succeeds in operating the controller A short disclaimer: I have done some kernel coding in the past, but I'm definitely not an expert, so I may very well be completely mistaken about this. Therefore, cue the questions: - Is this plan even remotely sensible? - If so, can you give me some pointers on how to achieve this? - Any other hints? ;-) Many thanks, Yours, Florian P.S. Here's an excerpt from the kernel log (2.6.25): oliver ata_piix 0000:00:1f.2: version 2.12 oliver ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 19 oliver ata_piix 0000:00:1f.2: MAP [ IDE IDE P1 P3 ] oliver PCI: Setting latency timer of device 0000:00:1f.2 to 64 oliver scsi0 : ata_piix oliver scsi1 : ata_piix oliver ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x18b0 irq 14 oliver ata2: SATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0x18b8 irq 15 -- 0666 - Filemode of the Beast -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
