On Sun, Jun 8, 2014 at 9:53 PM, H. Peter Anvin <[email protected]> wrote: > > This would point either to an iommu problem, or a problem in the driver > where addresses somehow get truncated to 32 bits. Since this is a > graphics driver it is extremely complex, and subtle problems could be > buried somewhere inside it. The fact that you can trigger it without a > driver would point to that kind of problem inside the firmware. > > -hpa
My assumption is that in new BIOSes (old ones are working, as I've said, for T440p) there is some new way nvidia should be enabled, and it's not related to ACPI (the calls are same in Windows). There are no related changelog entries for T440p [1] (between 1.14 and 1.16). Also, about address truncation: I thought so too, but if I understand correctly, then some memory in >=4G region should be reserved for some driver's use, and this is not the case (see [2] for /proc/iomem). Nikolay Amiantov. [1]: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/gluj13us.txt [2]: http://bpaste.net/show/355712/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
