From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 177791] New: screen flickering with intel_iommu=on
Date: Mon, 17 Oct 2016 04:14:08 +0000
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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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