Ok, I've continued learning, more info injected below: On 04/16/10 14:42, pat-lkml@xxxxxxxxx wrote: > Ok, first time poster, long time reader. > > I have a Clevo D900T mobo based laptop. These were only ever produced > with p4 5xx series chips, but the chipset (ICH6) supports the 6xx series. > Because it was never produced with a 6xx cpu, a bios was never released > that supported things like EIST or EM64T. EM64T worked fine, out of the > box. EIST did not (due to no SSDT tables with PSS/PCT/PPC methods). I was > able to get EIST working with a hacked-up DSDT, but I'm curious if I'm > doing everything I should. > > Intel CPU Spec: http://processorfinder.intel.com/details.aspx?sSpec=SL8Q7 > Intel Data Sheet: > http://download.intel.com/design/Pentium4/datashts/303128.pdf > > Right now, I just have 2 C States, for 3.0Ghz and 2.8Ghz. It's my > understanding that these are the only speeds EIST can do in this CPU. > > now, the questions: > > 1. Is there something I should be doing with a _CSD type entry in my > CPU{0,1} entries to signify that they're HT? Yep, I needed to add a pair of _CSD entries. EIST is now adjusting speeds correctly! > 3. How do I determine VID values? > a. I've just lowered VID 1 by 1, loading the system until it became > unstable, at which point I added 1 and called it good > b. Is there any advantage to multiple VID's with 1 VID? IE: > 3ghz@xxxxx, 3Ghz@xxxxx People in linux-pch have helped me here > 4. in the PSS table, the first entry (3000,2800 in my case), are those > just for show? Still don't have an answer here. > 5. Are there additional features the CPU supports that, due to bios > limitation, I should enable this way (C1E?) Ok, I now now I need to come up with a _CST table (unless one of the other tables is doing this...) to enable C-States, and C1E in particular... Anyone have any pointers on where to start on this? All of the info I seem to be able to find are for C2Q and newer CPUs, not older P4s like what I have. > outline of what I've done: http://pat.erley.org/Other/P4EISTSSDT > > Pat Erley Pat Erley -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
