https://bugzilla.kernel.org/show_bug.cgi?id=208363
Bug ID: 208363
Summary: Restart failure with iommu error needs Intel i915
driver support
Product: ACPI
Version: 2.5
Kernel Version: 5.6
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: BIOS
Assignee: acpi_b...@kernel-bugs.osdl.org
Reporter: hsiaoting.w...@gmail.com
Regression: No
Created attachment 289919
--> https://bugzilla.kernel.org/attachment.cgi?id=289919&action=edit
kernel log with patches as described.
Restart failure with iommu error needs Intel i915 driver support.
We found a restart failure issue on Tigerlake platform and after debugging, we
need Intel to support with i915 driver.
Reproduce Steps:
1.Suspend the system
2.press power button to wake up system
3.Restart the system
4.System will hang and can’t boot to user login screen.
Fail Rate: 100%
TGL platform
OS: Ubuntu 20.04
Related kernel log:
Jun 3 22:00:30 kernel: [ 117.686352] mei_hdcp
0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops
i915_hdcp_component_ops [i915])
Jun 3 22:00:30 kernel: [ 117.690538] done.
Jun 3 22:00:30 kernel: [ 117.712034] nvme nvme0: 8/0/0 default/read/poll
queues
Jun 3 22:00:30 kernel: [ 117.741473] PM: suspend exit
Jun 3 22:00:39 kernel: [ 126.457779] Lockdown: systemd-logind: hibernation is
restricted; see man kernel_lockdown.7
Jun 3 22:00:44 kernel: [ 132.024069] rfkill: input handler enabled
Jun 3 22:00:45 kernel: [ 132.293626] sof-audio-pci 0000:00:1f.3: firmware boot
complete
The fan keeps running, and the only way to power off system is long pressing
the power button.
We also tried the kernel parameters below (3 tests) and the reboot failure
cannot be reproduce:
nomodeset
i915.modeset=0
intel_iommu=igfx_off
Based on Intel suggestion, we patched:
Patch 1:
https://patchwork.freedesktop.org/patch/355270/
Patch 2:
https://patchwork.freedesktop.org/patch/365227/
Same as previous situation.
System restart successfully but wait a long time to shutdown.
The waiting point is still at iommu_disable_translation()@intel-iommu.c.
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