I've been using this kernel for three days. This kernel fixes my flicker
issue without adding "intel_iommu=igfx_off".
$ lspci -nnk | grep -A3 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 630
[8086:591b] (rev 04)
DeviceName: Onboard IGD
Subsystem: ASUSTeK Computer Inc. HD Graphics 630 [1043:15e0]
Kernel driver in use: i915
Previously, adding "intel_iommu=igfx_off" worked for me. "Ubuntu
6.8.0-48.48-generic 6.8.12" didn't solve my issue.
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https://bugs.launchpad.net/bugs/2086587
Title:
Random flickering with Intel i915 (Comet Lake and Kaby Lake) on Linux
6.8
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Jammy:
Invalid
Status in linux source package in Noble:
In Progress
Status in linux source package in Oracular:
In Progress
Status in linux source package in Plucky:
In Progress
Bug description:
[Impact]
The flickering predominantly occurs when the mouse cursor is in the bottom
quarter of the screen and stops when the cursor leaves this area.
Extensive testing across various kernel versions revealed that the issue
became apparent from kernel version 6.8.0 onward, correlating with the
mentioned configuration changes, CONFIG_INTEL_IOMMU_DEFAULT_ON and
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON.
The problem persists in the latest drm tip.
[Fix]
As an immediate workaround, adding 'intel_iommu=igfx_off' to the kernel
command line has been found to effectively eliminate the flickering issue.
This patch proposes the same behavior as 'intel_iommu=igfx_off' and apply the
rule to all Intel SKL GPU IDs.
[Test]
1. Boot up to desktop with 6.8.0-x kernels
2. Moving cursor around the desktop
3. There should be no flicker while cursor is moving
[Where problems could occur]
For virtualized environments using hardware-assisted virtualization for
graphics (such as VFIO or mediated pass-through), disabling IOMMU for graphics
could either disable these features or reduce their security and efficiency.
Usually, users pass the 'intel_iommu=on' by themselves when they are using
related features. So, the impact of this change is minimal.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2086587/+subscriptions
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