This bug was fixed in the package linux - 6.12.0-12.12
---------------
linux (6.12.0-12.12) plucky; urgency=medium
* plucky/linux: 6.12.0-12.12 -proposed tracker (LP: #2095505)
* Miscellaneous Ubuntu changes
- [Packaging] temporarily disable signing for s390x
* Miscellaneous upstream changes
- modpost: remove unnecessary check in do_acpi_entry()
- modpost: introduce module_alias_printf() helper
- modpost: pass (struct module *) to do_*_entry() functions
- modpost: call module_alias_printf() from all do_*_entry() functions
- modpost: fix the missed iteration for the max bit in do_input()
- modpost: work around unaligned data access error
-- Paolo Pisati <paolo.pis...@canonical.com> Wed, 22 Jan 2025 15:27:46
+0100
** Changed in: linux (Ubuntu Plucky)
Status: Fix Committed => Fix Released
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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:
Fix Released
Status in linux source package in Jammy:
Invalid
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Fix Committed
Status in linux source package in Plucky:
Fix Released
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 KBL and CML GPU IDs.
[Test]
1. Boot up to desktop with ubuntu kernels(6.8+)
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.
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