Hi Will, This m400 HEST problem is blocking me from enabling APEI support in Debian [1], so I'd like to come to a conclusion on it. In summary from [2], Riku and Graeme mention they still have some m400 systems in use. Mark did some investigation and found the cause to be generated by the m400's firmware, appearing after the EFI stub's call to ExitBootServices. A few solutions to the problem were posted [2], [3] & [4], but none seemed to get overwhelming support. Do we want to have an arm64 specific in-kernel fix for this, or should it be left to the distro maintainers and end users to decide if and how they want to handle it? If an in-kernel fix is OK, what would be an acceptable solution that could be merged? Thanks for your input on this. [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900581 (linux: Enable Buster kernel features for newer ARM64 servers) [2] https://patchwork.codeaurora.org/patch/547277/ (arm64/acpi: Add fixup for HPE m400 quirks) [3] https://www.spinics.net/lists/arm-kernel/msg661799.html (disable_hest quirk on HP m400 with bad UEFI firmwware) [4] https://www.mail-archive.com/linux-efi@xxxxxxxxxxxxxxx/msg10212.html (efi: add contents of LinuxExtraArgs EFI var to command line) -Geoff -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
