I also experience flickering/glitches with my Intel i7-10700k.
```
$ lspci -nnk | grep -A3 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation CometLake-S GT2
[UHD Graphics 630] [8086:9bc5] (rev 05)
DeviceName: Onboard - Video
Subsystem: ASUSTeK Computer Inc. CometLake-S GT2 [UHD Graphics 630]
[1043:8694]
Kernel driver in use: i915
```
In my case I often see a glitchy horizontal line about a quarter of the
way down from the top of the monitor screen. It is most prevalent when
I use the mouse to drag a window through this region.
This system was upgraded through successive Kubuntu LTS versions until
finally arriving at Kubuntu 24.04.1.
I tried the various changes to /etc/default/grub including
`intel_iommu=igfx_off` and the flickering remained.
Interestingly if I boot from a USB flash drive with the
kubuntu-24.04.1-desktop-amd64.iso image then I do not experience any
flickering.
Following are some differences in packages that I noticed that may or
may not be relevant to the problem.
Output from `uname -a` on USB flash drive (upper) and on (lower)
----------------------------------------------------------------
Linux kubuntu 6.8.0-41-generic #41-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 2
20:41:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Linux kaby 6.8.0-51-generic #52-Ubuntu SMP PREEMPT_DYNAMIC Thu Dec 5
13:09:44 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Output from ` dpkg -l | grep -i intel | grep -vi intelligent`
-------------------------------------------------------------
on USB flash drive (no flickering)
----------------------------------
```
ii firmware-sof-signed 2023.12.1-1ubuntu1
all Intel SOF firmware - signed
ii i965-va-driver:amd64
2.4.1+dfsg1-1build2 amd64 VAAPI driver for Intel
G45 & HD Graphics family
ii intel-media-va-driver:amd64 24.1.0+dfsg1-1
amd64 VAAPI driver for the Intel GEN8+ Graphics
family
ii intel-microcode
3.20240813.0ubuntu0.24.04.2 amd64 Processor microcode
firmware for Intel CPUs
ii iucode-tool 2.3.1-3build1
amd64 Intel processor microcode tool
ii libdrm-intel1:amd64 2.4.120-2build1
amd64 Userspace interface to intel-specific
kernel DRM services -- runtime
ii libigdgmm12:amd64 22.3.17+ds1-1
amd64 Intel Graphics Memory Management Library
-- shared library
ii libipt2 2.0.6-1build1
amd64 Intel Processor Trace Decoder Library
ii xserver-xorg-video-intel
2:2.99.917+git20210115-1build1 amd64 X.Org X server --
Intel i8xx, i9xx display driver
```
on SSD (yes flickering)
-----------------------
```
ii firmware-sof-signed
2023.12.1-1ubuntu1.3 all Intel SOF firmware -
signed
ii i965-va-driver:amd64
2.4.1+dfsg1-1build2 amd64 VAAPI driver for Intel
G45 & HD Graphics family
ii i965-va-driver:i386
2.4.1+dfsg1-1build2 i386 VAAPI driver for Intel
G45 & HD Graphics family
ii intel-media-va-driver:amd64 24.1.0+dfsg1-1
amd64 VAAPI driver for the Intel GEN8+ Graphics
family
ii intel-media-va-driver:i386 24.1.0+dfsg1-1
i386 VAAPI driver for the Intel GEN8+ Graphics
family
ii intel-microcode
3.20241112.0ubuntu0.24.04.1 amd64 Processor microcode
firmware for Intel CPUs
ii iucode-tool 2.3.1-3build1
amd64 Intel processor microcode tool
ii libdrm-intel1:amd64 2.4.120-2build1
amd64 Userspace interface to intel-specific
kernel DRM services -- runtime
ii libdrm-intel1:i386 2.4.120-2build1
i386 Userspace interface to intel-specific
kernel DRM services -- runtime
ii libigdgmm12:amd64 22.3.17+ds1-1
amd64 Intel Graphics Memory Management Library
-- shared library
ii libigdgmm12:i386 22.3.17+ds1-1
i386 Intel Graphics Memory Management Library
-- shared library
ii libipt2 2.0.6-1build1
amd64 Intel Processor Trace Decoder Library
ii xserver-xorg-video-intel
2:2.99.917+git20210115-1build1 amd64 X.Org X server --
Intel i8xx, i9xx display driver
```
Key differences I noticed in the "intel packages" were:
- firmware-sof-signed: 2023.12.1-1ubuntu1 versus
2023.12.1-1ubuntu1.3
- intel-microcode: 3.20240813.0ubuntu0.24.04.2 versus
3.20241112.0ubuntu0.24.04.1
- Also extra i386 packages on my SSD.
Hopefully this information will help to troubleshoot.
If more information is needed then let me know.
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https://bugs.launchpad.net/bugs/2062951
Title:
Random flickering with Intel i915 (Gen4+ GPUs) on Linux
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