Issue #121 has been updated by Anastasios Koutian.
Anastasios Koutian wrote in #note-90:
Patrick Rudolph wrote in #note-89:
I checked the vendor BIOS for (X220, T420 and T420s) and it hard-codes PSI2 and PSI3 values to 0 in PowerManagment2.efi. The X230 vendor BIOS does not hard-code those values in PowerManagment2.efi. Thus this is likely a bug in the voltage regulator used on Sandy-Bridge platforms.
I've created https://review.coreboot.org/c/coreboot/+/82070 based on this, please test.
Hi Patrick, I have cherry-picked your commit on top of coreboot main and I am testing on my T420. I will inform you of the results.
System froze again after a couple of days. Unfortunately, this does not seem to have fixed the bug, however being able to set VR config in device tree is a very useful feature.
---------------------------------------- Bug #121: T520: Hangs in OS https://ticket.coreboot.org/issues/121#change-1822
* Author: Firstname Lastname * 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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Anastasios Koutian