On Sunday 2020-02-16 01:32, Rafael J. Wysocki wrote: >On Fri, Feb 14, 2020 at 8:28 PM Jan Engelhardt <jengelh@xxxxxxx> wrote: >> >> I have a problem with a certain x86 laptop, and judging from the >> kernel's output, this looks very much like a broken ACPI table. >> Versions tried are 5.3.8 (Fedora31 liveimage), 5.5.2 (openSUSE >> Tumbleweed installer) and 5.6.0-rc1+ >> (b19e8c68470385dd2c5440876591fddb02c8c402; self compile), all >> exhibiting the same hang. >> ACPI: \: Used as first EC >> ACPI: \: GPE=0x10, IRQ=-1, EC_CMD/EC_SC=0x66, EC_DATA=0x62 > >Would it be possible to try 5.0 or earlier on the problematic machine? >You may be hitting a regression here. Seems not to be the case. The same hang shows, with slightly different messages. 5.0 unable to progress to the problem point... the NMI watchdog causes a panic due to the slow scrolling of earlyprintk=efi 4.12.14 (openSUSE) ACPI: : EC: EC started ACPI: : EC: interrupt blocked ACPI: \: Used as first EC ACPI: \: GPE=0x10, EC_CMD/EC_SC=0x66, EC_DATA=0x62 (no mention of IRQ=-1) ACPI: \: Used as boot ECDT EC to handle transactions <hang> 4.4.76 (openSUSE) ACPI : EC: EC description table is found, configuring boot EC ACPI : EC: EC started <hang> I thus went back to 5.6-rc and enabled full ACPI tracing (layer=0xffffffff/level=0xffffffff) starting from nsinit.c:213 /* Walk namespace to execute all _INIs on present devices */ onwards. That log output is at http://inai.de/files/m923.mp4 [53MB].
