* [Bug 177791] New: screen flickering with intel_iommu=on
@ 2016-10-17 4:14 bugzilla-daemon
2016-10-17 4:39 ` [Bug 177791] " bugzilla-daemon
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: bugzilla-daemon @ 2016-10-17 4:14 UTC (permalink / raw)
To: kvm
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: virtualization_kvm@kernel-bugs.osdl.org
Reporter: v@robolab.it
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
@ 2016-10-17 4:39 ` bugzilla-daemon
2016-10-18 11:39 ` bugzilla-daemon
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2016-10-17 4:39 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #1 from v@robolab.it ---
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
2016-10-17 4:39 ` [Bug 177791] " bugzilla-daemon
@ 2016-10-18 11:39 ` bugzilla-daemon
2016-10-21 15:54 ` bugzilla-daemon
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2016-10-18 11:39 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #2 from v@robolab.it ---
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
2016-10-17 4:39 ` [Bug 177791] " bugzilla-daemon
2016-10-18 11:39 ` bugzilla-daemon
@ 2016-10-21 15:54 ` bugzilla-daemon
2016-11-17 9:29 ` bugzilla-daemon
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2016-10-21 15:54 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
kolAflash <kolAflash@kolahilft.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kolAflash@kolahilft.de
--- Comment #3 from kolAflash <kolAflash@kolahilft.de> ---
Maybe related: https://bugs.freedesktop.org/show_bug.cgi?id=97450
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* [Bug 177791] screen flickering with intel_iommu=on
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
` (2 preceding siblings ...)
2016-10-21 15:54 ` bugzilla-daemon
@ 2016-11-17 9:29 ` bugzilla-daemon
2017-02-20 8:19 ` bugzilla-daemon
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2016-11-17 9:29 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #4 from v@robolab.it ---
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
` (3 preceding siblings ...)
2016-11-17 9:29 ` bugzilla-daemon
@ 2017-02-20 8:19 ` bugzilla-daemon
2017-02-20 8:26 ` bugzilla-daemon
` (2 subsequent siblings)
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From: bugzilla-daemon @ 2017-02-20 8:19 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
v@robolab.it changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|4.8 |4.8,4.9
Severity|normal |low
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* [Bug 177791] screen flickering with intel_iommu=on
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
` (4 preceding siblings ...)
2017-02-20 8:19 ` bugzilla-daemon
@ 2017-02-20 8:26 ` bugzilla-daemon
2017-11-06 10:23 ` bugzilla-daemon
2017-11-06 10:24 ` bugzilla-daemon
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-02-20 8:26 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
v@robolab.it changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INSUFFICIENT_DATA
--- Comment #5 from v@robolab.it ---
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
` (5 preceding siblings ...)
2017-02-20 8:26 ` bugzilla-daemon
@ 2017-11-06 10:23 ` bugzilla-daemon
2017-11-06 10:24 ` bugzilla-daemon
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-11-06 10:23 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
Adrian (A.Fiergolski+kernelBugzilla@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |A.Fiergolski+kernelBugzilla
| |@gmail.com
--- Comment #6 from Adrian (A.Fiergolski+kernelBugzilla@gmail.com) ---
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
2016-10-17 4:14 [Bug 177791] New: screen flickering with intel_iommu=on bugzilla-daemon
` (6 preceding siblings ...)
2017-11-06 10:23 ` bugzilla-daemon
@ 2017-11-06 10:24 ` bugzilla-daemon
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-11-06 10:24 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=177791
--- Comment #7 from Adrian (A.Fiergolski+kernelBugzilla@gmail.com) ---
I am sorry for last comment. I chose wrong tab in the browser.
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