New: screen flickering with intel_iommu=on
https://bugzilla.kernel.org/show_bug.cgi?id=177791
Bug ID: 177791
Summary: screen flickering with intel_iommu=on
Product: Virtualization
Version: unspecified
Kernel Version: 4.8
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Hello,
I have found a strange bug with IOMMU: when I enable the IOMMU and put the mouse cursor at any width on 885'th or 1019'th pixel from the top, the screen glitches appear, like flickering or tearing.
It's difficult to explain, please see the videos:
IOMMU enabled: http://robolab.it/iommu/iommu_on.mp4 (28M)
IOMMU disabled: http://robolab.it/iommu/iommu_off.mp4 (3.7M)
The bug appears with Linux 4.7.6, 4.7.7, 4.8.0 and 4.8.1. I have not tried the current releases (4.8.2 and 4.7.8) yet.
System: Clevo P640RE laptop with Intel Core i7-6700HQ CPU
OS: openSuSE 13.2 x86_64
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[Bug 177791] screen flickering with intel_iommu=on
https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #1 from [email protected] ---
Created attachment 241861
--> https://bugzilla.kernel.org/attachment.cgi?id=241861&action=edit
kernel config
Forgot to mention that nothing new appears in dmesg when the screen flickers.
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #2 from [email protected] ---
Update: booting with "intel_iommu=on,igfx_off" removes screen flickering with mouse cursor on 885th and 1019th pixels height.
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
kolAflash <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #3 from kolAflash <[email protected]> --- Maybe related: https://bugs.freedesktop.org/show_bug.cgi?id=97450
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #4 from [email protected] ---
I have installed the kernel 4.8.7 because I saw many improvements with i915 in the changelog, but the problem still persists.
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|4.8 |4.8,4.9
Severity|normal |lowSignature · 2 lines
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INSUFFICIENT_DATA--- Comment #5 from [email protected] ---
The problem still persists in kernel version 4.9.11.
However I've changed the Importance field to "Low" and Status to RESOLVED because I can live with the workaround "intel_iommu=on,igfx_off" and seems that this bug does not affect other people.
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
Adrian ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |A.Fiergolski+kernelBugzilla
| |@gmail.com--- Comment #6 from Adrian ([email protected]) --- Hello,
Could you point a parch which fixes this issue ?
Current Ubuntu kernel seems to suffer this bug.
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[Bug 177791] screen flickering with intel_iommu=on
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #7 from Adrian ([email protected]) --- I am sorry for last comment. I chose wrong tab in the browser.
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