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Tue, 4 Aug 2026 19:08:15 +0000 Message-ID: Date: Tue, 4 Aug 2026 21:08:11 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] no TPM device after "tpm_crb: Convert ACPI driver to a platform one" To: Julien CC: , , , "Rafael J. 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Both /dev/tpm0 and > /dev/tpmrm0 are missing. > > Log messages: > platform MSFT0101:00: failed to claim resource 1: [mem > 0xfed40000-0xfed40fff] > acpi MSFT0101:00: platform device creation failed: -16 > So there's no platform device for the driver to bind to. I think that these messages have been present in the kernel logs for quite some time, but previously they were not connected to any functional issues. > I added some debug logging: > ACPI resourcet[0] = [mem 0xfed40040-0xfed4103f flags 0x200] > ACPI resourcet[1] = [mem 0xfed40000-0xfed40fff flags 0x200] > > I think the failure happens in kernel/resource.c: __insert_resource() > because of the two memory regions overlapping. > This is quite plausible, but if that's the case, it should be fixable. Let me figure out something. > I am attaching the TPM SSDT and the SDDT defining PTTB ACPI variable > address. > The value of PPTB > dd if=/dev/mem bs=1 skip=$((0x8AE5CFDC)) count=8 | hexdump -C > 40 00 d4 fe 00 00 00 00 > > Hardware information: >   Manufacturer: Acer >   Model: Aspire ES1-572 >   BIOS vendor: Insyde Corp. >   BIOS version: V1.16 >   BIOS date: 09/18/2018 > > Thanks > > #regzbot introduced: 48fe2cddc85c >