https://bugs.freedesktop.org/show_bug.cgi?id=110360
Bug ID: 110360
Summary: AMD system hits AMD-Vi: Completion-Wait loop timed out
on Acer Squirtle_SR laptop
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/AMDgpu
Assignee: dri-devel@lists.freedesktop.org
Reporter: jian-h...@endlessm.com
Created attachment 143905
--> https://bugs.freedesktop.org/attachment.cgi?id=143905&action=edit
The error log
We have an Acer Squirtle_SR laptop equipped with AMD A9-9420e RADEON R5, 5
COMPUTE CORES 2C+3G and [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 /
M440/M445] [1002:6900]. We test it with Linux kernel 5.1.0-rc4. The system
hits the following error and makes system hang up:
Apr 09 11:28:57 endless kernel: AMD-Vi: Completion-Wait loop timed out
Apr 09 11:28:57 endless kernel: iwlwifi 0000:03:00.0: AMD-Vi: Event logged
[IO_PAGE_FAULT domain=0x0000 address=0xff814000 flags=0x0050]
The worst case is the disk's block may be disrupted, then we have to re-install
the system if it cannot be recovered by fsck.
If we blacklist the amdgpu module, then system will not hit the error. But
system has no GUI, and only shows console.
If iommu=soft is appended to the boot command, system works fine.
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