i've played with win8 and power states:
cpu C1 - works
acpi C2 - broken
acpi C3 - broken
cpu MWAIT - works (enter only C7s and C10)

seems _CST/_OSC/xxx tables contain only mwait correct states, remains are broken.

p.s. very simple implementation of mwait in Haiku OS:

int dummy;
monitor(&dummy, 0, 0);
mwait(sCStates[state].fCode | subState, MWAIT_INTERRUPTS_BREAK);
 

where "state" is selected from C1 to C10

Zitat von diderius6 im Beitrag #188

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3d mark 2001 is more than 25 % faster on XP than on win10^^.

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Zitat von XPLives im Beitrag #189

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This only could be used for installing XP onto one machine but not migrate.
After XP is installed in SATA AHCI on SkyLake you then move the hard drive / SSD to the Ivy Bridge computer and try booting in SATA AHCI mode it should do BSOD 7B or a Reboot Loop.

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Zitat von XPLives im Beitrag #184

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@Mov AX, 0xDEAD
Is it more than just the code that has been removed in SkyLake+?

Why does this still work on Z87 and Z97 and not in Z170 if you understand it well enough to explain in more detail than good luck response which isn't helpful?

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Zitat von XPLives im Beitrag #175

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One day Intel USB 4.0 will arrive and the same USB installers will fail or the authors of these USB installers no longer care about XP.Most of these USB installer tools don't even work inside XP anymore and require Windows 7+ to create the USB install image

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Zitat von XPLives im Beitrag #175

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https://www.win-raid.com/t4092f45-Guide-How-to-install-Windows-XP-OS-on-Modern-Hardware.html

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Zitat von XPLives im Beitrag #169

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This will make XP SATA installation without the need of AHCI slipstream first method. Laptops could use this to install XP lacking an optical disc drive requirement. This will solve the headaches many are experiencing since USB installation on SkyLake+ can be problematic and fail

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Zitat von Fernando im Beitrag #1858

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it is the driver itself (= *.SYS file)

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Zitat von AbsoluteZero im Beitrag #1847

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Zitat

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z390 USB host driver is open source and can be ported easily.
the problem is to get signature to not disable windows protection

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Fake. No one manufacturer has published a source codes for usb controllers at win platfrom.
MS created driver for win8+ based on usb 3.0 specification, but with vendor "quirks" (see linux usb3 sources), 3.1 is compatible with 3.0, so generic driver works with 3.1 too, but maybe not optimal

Zitat von diderius6 im Beitrag #148

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And maximal unclear is for me, why I have no success with ACPI on my Asrock z370 board.
The bios DSDT table is nearly one by one like the Bios DSDT table from gigabyte H110M-S2H.
May be, another device is called, where until now I do not prevent it from reserved words from Acpi 2.0,

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Hi,

Some info about bug with Acpi Timer on Skylake+ platforms:
- XP preSP2 uses TSC, not affected
- XP SP2,SP3 uses acpi timer, affected
- Vista search for HPET Timer and uses it, frequency is 14.31818 MHz (4 x freq of Acpi timer), not affected
- Vista uses acpi timer if didn't find HPET, affected
- Win7+ check quality of processor counter (TSC), skylake+ cpus have constant rate counter, so these OSes use TSC and not affected. Unlike XP, processor raw frequency divided to 1024, for example 3600Mhz/1024=3.579545Mhz (avoid arithmetic 32bit overflow in old-gen apps ?)
- If Win7+ forced to not use TSC (bcdedit.exe /set useplatformclock true), it search for HPET and uses it, not affected
- If Win7+ forced to not use TSC and didn't find HPET, it uses acpi timer, affected

Regarding acpi specs and intel specs on pch chipset, acpi timer generates hardware SCI interrupt (IRQ #9) if TMR_EN bit is SET. This bit is SETted on live system, but windows doesnt receive any interrupts. Near to TMR_EN exist PWRBTN_EN bit (generates SCI at power button press), and if we press button, windows receive interrupt (surprise!)

I came to the conclusion that this is a bug at the platform level. Maybe bios doesnt set some hardware regs or intel forget to say something about additional requirements, who knows....