Issue #121 has been updated by Patrick Rudolph.
Category set to chipset configuration Status changed from New to In Progress Affected hardware set to SNB, IVY Affected OS set to -
Limiting the package C-state to C2 using MSR MSR_PKG_CST_CONFIG_CONTROL seems to work around the issue. With this workaround the CPU cores can still enter C7 and no cmdline fix in Linux is required. It draws about 1-2Watts more power in idle.
**The issue is thus related to the 'package C-state', not the 'CPU C-state'.** I was trying to figure out what happens on package C-states: - Package C2: - CPUs are in C3 or higher - bus traffic or device latency requirements keep it in C2 - Package C3: - DRAM is in self refresh - Primary (IA Core power) and secondary plane (Graphics) VR are switched into light mode - Package C6: - CPU voltage is turned off - Package C7: - L3 cache is turned off - Chipset doesn't snoop
It is possible that the issue is DRAM / native ram init related. When Package C3 is entered and the DRAM is placed in self refresh.
---------------------------------------- Bug #121: T520: Hangs in OS https://ticket.coreboot.org/issues/121#change-1682
* Author: Julz Buckton * Status: In Progress * Priority: Normal * Category: chipset configuration * Start date: 2017-06-09 * Affected hardware: SNB, IVY * Affected OS: - ---------------------------------------- I have been running coreboot since 2017.04.15 and have experienced hangs ever since then. It was suggested by folk on the IRC that I run memtest to check for incorrect raminit causing errors, however I have run memtest for 12 hours straight with no errors.
Due to the ambiguous nature of the hangs (immediate freeze with no warning signs, audio gets stuck repeating the last 50ms or so of noise, not sure what this effect is called) I don't have much useful information other than the .config and dmesg. However one thing I can say with high confidence is that the hangs occur significantly more frequently in Linux (*buntu distros) than Windows 10. Within an hour of launching Linux a hang is likely, whereas Windows typically runs for many hours before a hang occurs. I considered this an insignificant anecdotal anomaly at first but over the course of the nearly 2 months I have been running coreboot it seems to be a solid trend. The hangs occur anywhere, typically during mere desktop usage or basic web browsing.
Additionally there is another form of hang I experience where the screen goes black except for some sort of graphical corruption down the left side (http://i.imgur.com/4zWrlpX.jpg), whether this is related to the more common total freeze hangs I don't know but I figured I should include it nonetheless. These hangs only occur about 1:20 compared to the regular hangs.
---Files-------------------------------- config (20.7 KB) dmesg.txt (57.3 KB) cbmem-raminit.txt (62 KB) lspci.txt (29.6 KB) cpuinfo.txt (3.94 KB) defconfig (1023 Bytes) defconfig (699 Bytes)
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Patrick Rudolph