intel_idle.max_cstate=4 definitely not working for me so will try
intel_idle.max_cstate=2 as folks have noted and see what occurs
00:02.0 VGA compatible controller: Intel Corporation CometLake-H GT2 [UHD
Graphics] (rev 05) (prog-if 00 [VGA controller])
DeviceName: Onboard IGD
I've been testing kernel 6.8.0-38 (from proposed) and while it's not
fixing the problem completely, at least on my hardware it is
significantly better.
The flickering happened only once in 3 days and it was very brief (~1s)
and I didn't have to do anything for it to stop. Previously I had to
move
Oh having read the manpage for lspci it suggests a more comprehensive output.
Again Lenovo T460s, trouble started on upgrade to 24.04 from 20
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core
Processor Host Bridge/DRAM Registers (rev 08)
Subsystem: Lenovo
For what it is worth my laptop too. An old Lenovo Thinkpad T460s.
The apport report case is closed..
tried using older kenel on grub load, didn't really help.
here is output of lsbci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core
Processor Host Bridge/DRAM
Not just Skylake. The duplicates I'm seeing reported from Noble machines
are from Comet Lake and Kaby Lake. So all Intel "Gen9" GPUs.
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Title:
info regarding bug 2046315
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Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
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same issue
intel hd530
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Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
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** Tags added: flicker i915 mantic noble
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Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
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People suggest adding "i915.enable_dc=0 intel_idle.max_cstate=2" to the cmdline
but for my hardware "intel_idle.max_cstate=4" is sufficient.
I believe higher max_cstate will result in lower power consumption and
enable_dc is not needed.
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** Changed in: linux (Ubuntu)
Assignee: Anthony Wong (anthonywong) => AceLan Kao (acelankao)
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Title:
Random flickering with Intel i915 on
I recently upgraded from 22.04 to 24.04 (through v23.10 via do-release-
upgrade) and now have symptoms similar to those described (flickering of
windows, especially when moving them and I also get screen lockup when
trying to dock a window to top/sides of desktop). Running two displays
on my dell
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
Same problem here, using Kubuntu 24.04 on a fresh install (with Xorg).
Intermittent flickering of the whole screen; I could not determine a
specific pattern that caused it. Happened several times per day, usually
briefly but sometimes for several seconds.
Adding "i915.enable_dc=0
I think I'm having the same issue
I am running TPM+FDE on Ubuntu 24.04. I tried to apply the workaround suggested
with following command:
snap set system system.kernel.dangerous-cmdline-append="i915.enable_dc=0
intel_idle.max_cstate=2"
But I'm still seeing the same after a reboot. In my case,
I'm having a similar issue
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2062950
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Title:
Random flickering with Intel i915 on Linux 6.8
Same problem here:
ThinkPad T470s
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620
(rev 02)
Distributor ID: Ubuntu
Description:Ubuntu 24.04 LTS
Release:24.04
Codename: noble
filename:
I have back tracked to the duplicate bug
https://bugs.launchpad.net/bugs/1958191 and followed the suggested fix,
which was patch grub boot;-
Patched my grub boot file GRUB_CMDLINE_LINUX_DEFAULT="quiet splash
i915.enable_dc=0 intel_idle.max_cstate=2"
sudo update-grub and restarted machine
Works
@vartee
This bug is Intel i915 specific.
I am afraid you are experiencing AMDGPU related issue and should look
for related open bug or open one by your self.
P.S.
I remember having similar flickering issues with AMDGPU and adding
"amdgpu.dcdebugmask=0x10" helped. Note, it was completely
In bug 1958191 (which looks similar and may or may not be the same
issue) there is a slightly different workaround:
"adding the kernel parameter i915.enable_dc=0 intel_idle.max_cstate=2
fixed this"
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Hi, OK I have tried both temporary and permanent grub boot changes with
modified intel_idle.max_cstate=2 and 4 and on all occasions after grub
update and reboot the boot splash page is steady the login page flickers
badly and the desktop settles but still flickers.
Tks for the help but
Proper fix might come in future releases of Linux kernel.
For now adding "intel_idle.max_cstate=4" to the kernel command line should work
at expense of a minor power consumption.
See
https://wiki.ubuntu.com/Kernel/KernelBootParameters#Permanently_Add_a_Kernel_Boot_Parameter
for instructions.
Ive never had the issue with any distro.
So okay the bug is confirmed and it has a duplicate but in none of the
reports, duplicates or otherwise, can I find a fix.
Running 24.04 on a Dell Insperion 9555 Intel i7 64/16Gig 1tb Radeon
graphics
Does a fix exist for this bug ??
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** Summary changed:
- Random flickering with i915 on Linux 6.8
+ Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
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