-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to the PCI express standard, the Link Capabilities register lies at offset 0xC within the PCI Express root port capabilities descriptor. lspci decoded this and shows Unknown ASPM support, because its value is zero, and this is why the kernel did not enable ASPM in the Link Control register. According to the Intel datasheets, the offsets AC-AFh ( the structure itself starts at A0h ) are reserved. So astonishingly it seems that Intel does not know about the Link Capabilities register! On the other hand, the contents of the register actually do seem to be mostly correct, despite what their datasheet claims. The one thing wrong with it is that it claims no ASPM support, despite Intel claiming that it is supported. For reference, the Intel datasheet I have been referring to is document 324642-003: 2nd Generation Intel® CoreTM Processor Family Desktop, Intel® Pentium® Processor Family Desktop, and Intel® Celeron® Processor Family Desktop Datasheet, Volume 2, table 2-8 on page 84. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJRn8Y/AAoJEJrBOlT6nu75P78IAMgL23DGmsBD+TKm3Ootr36E 5iG7NoPcvjYiP/yeHBvhXy5jw4ORfVFLEli82fFOTWAi1YL5mxRKctIiYzu9080N T1YO34qE/QpXfu6PDYMuNQETteO7MElnM7SHpQQ1oG5pAjPjUB1Bjb54qm4fQt77 11q8W6w3KFegy6cZLqAMHO63gzqUL9G/Akn4BdGvjZyt2ouOZOBU6Siyu0wm+RZY NUuoy+5wzaej9/T96XCkfHR1e5s32NdvkT9GUxhA8SONEOy892QvOuMWPWv/VHxr YkVGkaGHXuLLyXNWvy1Tz31HqZlbFaDRw7VzfbW5iE7cMi9EsZxSfjSvSqPZ+/A= =8hms -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
