Hi,
On 8/2/2026 2:54 PM, Julien wrote:
Hello,
Please keep in mind this is my first time reporting a Linux kernel
regression.
Since commit 48fe2cddc85c ("tpm_crb: Convert ACPI driver to a platform
one"), my TPM device is no longer available. 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
