Issue #121 has been updated by Patrick Rudolph.
Does limiting the max C-state in MSR MSR_PKG_CST_CONFIG_CONTROL also work around the issue? What setting is being used on vendor firmware for MSR MSR_PKG_CST_CONFIG_CONTROL?
Currently the code doesn't check if the processor supports C6/C3 sleep states, it just assumes it does. According to the BWG, when bus masters, that cannot tolerate long bus master latency, are present, the BM_STS avoidance must be used for C3/C6 states.
It sounds a bit like this could be the case here. The CPU is in C3/C6 and takes too long to wake in order to handle the bus master request. If enabled the acpi_idle_bm_check() would then prevent the CPU from entering a higher C-state (deeper sleep) when a bus master is active (similar to what intel_idle.max_cstate=2 does).
---------------------------------------- Bug #121: T520: Hangs in OS https://ticket.coreboot.org/issues/121#change-1665
* Author: Julz Buckton * Status: New * Priority: Normal * Start date: 2017-06-09 ---------------------------------------- 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