[Bug 2062951] Re: Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)

Transitioning from Manjaro to Ubuntu #Fix_Available

I had been experiencing some issues with Manjaro, so I finally decided
to switch to Ubuntu. Two days ago, I installed Ubuntu 24.04. During the
system update and graphic driver installation, within less than an hour
of using the device, I noticed that the screen was flickering and
disappearing when I moved the mouse. Initially, I thought I had broken
the system (haha). After several attempts to fix it, tracing my steps,
and uninstalling the latest packages that might have caused the problem,
I finally reinstalled the system again.

To my dismay, after installing the new system and even before starting
to update it, the flickering returned. Damn. I'm just venting a bit,
don't mind me; I had a really bad day.

In the end, I can confirm that adding these parameters to GRUB resolved
the issue for me, perhaps at the cost of a bit of heat, but it's a good
workaround until the bug is fixed:

[ GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2" ]
Steps to Add Parameters to GRUB

- Open GRUB configuration file for editing:
[ sudo nano /etc/default/grub ]

- Modify the GRUB_CMDLINE_LINUX_DEFAULT line:
[ GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2"]

- Update GRUB configuration:
[ sudo update-grub ]


My Laptop Specifications

Brand and Model: Dell
Processor: Intel Core i7 (7th Generation)
Graphics Card: Intel HD Graphics 620

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https://bugs.launchpad.net/bugs/2062951

Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)

Status in linux package in Ubuntu:
Confirmed

Bug description:
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

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