Random flickering with Intel i915 (Gen9 GPUs) on Linux 6.8 (Ubuntu 24.04)
Affects | Status | Importance | Assigned to | Milestone | ||
---|---|---|---|---|---|---|
Linux |
New
|
Unknown
|
||||
linux (Ubuntu) | Status tracked in Oracular | |||||
Jammy |
Invalid
|
Undecided
|
Unassigned | |||
Noble |
Fix Committed
|
Medium
|
AceLan Kao | |||
Oracular |
In Progress
|
Undecided
|
AceLan Kao | |||
linux-hwe-6.8 (Ubuntu) | Status tracked in Oracular | |||||
Jammy |
Confirmed
|
Undecided
|
Unassigned | |||
Noble |
Invalid
|
Undecided
|
Unassigned | |||
Oracular |
Invalid
|
Undecided
|
Unassigned |
Bug Description
SRU Justification
[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_
The problem persists in the latest drm tip.
[Fix]
As an immediate workaround, adding 'intel_
This patch proposes the same behavior as 'intel_
[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.
===========
After migrating Mantic 23.10 install to Linux 6.8.0, I am experiencing heavy flickering at random.
It happens after a moderate to heavy on screen activity like window switching, scrolling etc.
It never happens when playing video or when there is no interaction using keyboard/pointer.
It tend to happen when the mouse cursor is in the bottom quarter of the screen and stops immediately when the cursor leaves that screen region.
Around the same time the following appears in kernel log:
kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
Happens on both X11 and Wayland on both KDE plasma and Mate (though less).
I first encountered the issue with Linux 6.8.0-11 and it still happens with Ubunutu's 6.8.0-28 and Mainline 6.8.7.
Kernels 6.6, 6.5, 6.1 and older did not have that issue.
Hardware is: Dell XPS 9350, Vendor Intel, Driver i915, Skylake GT2 [HD Graphics 520]
Software: Ubuntu 23.10, KDE Plasma 5.27.10 / Mate 1.26
Attaching kernel log for 6.8.0-28
tags: | added: kernel-bug regression-release |
Changed in linux (Ubuntu): | |
assignee: | nobody → Anthony Wong (anthonywong) |
summary: |
- Random flickering with i915 on Linux 6.8 + Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04) |
Changed in linux (Ubuntu): | |
assignee: | Anthony Wong (anthonywong) → AceLan Kao (acelankao) |
tags: | added: flicker i915 mantic noble |
summary: |
- Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04) + Random flickering with Intel i915 (Gen9 GPUs) on Linux 6.8 (Ubuntu + 24.04) |
Changed in linux: | |
status: | Unknown → New |
Changed in linux (Ubuntu Noble): | |
status: | New → In Progress |
Changed in linux (Ubuntu Oracular): | |
status: | Confirmed → In Progress |
Changed in linux (Ubuntu Noble): | |
assignee: | nobody → AceLan Kao (acelankao) |
description: | updated |
Changed in linux (Ubuntu Noble): | |
importance: | Undecided → Medium |
status: | In Progress → Fix Committed |
tags: | added: jammy |
tags: | added: regression-update |
Changed in linux-hwe-6.8 (Ubuntu Noble): | |
status: | Confirmed → Invalid |
Changed in linux-hwe-6.8 (Ubuntu Oracular): | |
status: | Confirmed → Invalid |
Changed in linux (Ubuntu Jammy): | |
status: | New → Invalid |
Changed in linux-hwe-6.8 (Ubuntu Jammy): | |
status: | New → Confirmed |
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