Hello,
I think I am experiencing the same issue so I am not opening a new bug
report. Below is the description I also posted a question about:
I have upgraded to Kubuntu 20.04 from 19.10. Session went ok but after
rebooting I noticed one or two times where my screen (external monitor
connected
** Tags added: focal
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Title:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun
Status in linux
It looks the same bug on my Linux Mint 19.2 Cinnamon, Linux Kernel:
4.15.0-72-generic
Using second second monitor with NVIDIA Corporation GF108M [GeForce GT 525M]
graphics.
The error log is on tty1 console:
[drm:intel_set_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder
A FIFO
@tjaalton?
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Title:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun
Status in linux package in
Hi Timo,
I wanted to try the AMD64 version at:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2019-11-14/.
But only unsigned kernels are shipped and I couldn't switch from UEFI or boot
unsigned kernels, because it's a corporate machine.
Do you have any ideas?
Regards
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@tjaalton I find this bug report useful since I can receive updates on how the
situation evolves. If there are know separate subclasses of the issue which are
fixed separately I agree that it would be a good idea to provide debugging
steps here to classify each subclass and track the subclass
there's a big rewrite of DP MST being done upstream
https://patchwork.freedesktop.org/series/68359/
which is the last portion of it. You could try latest drm-tip mainline
build from the mainline ppa to see if it's any better now.
anyway, having 'fifo underrun' in dmesg can mean many things, and
Do we have actually somebody assigned to this report? I've been playing with
the module parameters but nothing seem to be helping.
I added the debug parameter today, because none of the i915.enable_hangcheck=1
i915.error_capture=1 i915.verbose_state_checks=1 were helpful.
Should I fill a bug
Since my upgrade from 19.04 to 19.10 my T430 is facing a similar problem
with i915 fifo underruns:
The problem occurs by switching from user A to B. If user A is logged in
and want to switch to another user B (e.g. admin), then after entering
the credentials of the user B, the system hangs up.
Just a small update:
I have been using i915.enable_psr=0 i915.enable_dc=0 i915.enable_fbc=0
i915.enable_dp_mst=1 parameters for a few days, but except the very first or
first two days when I unplugged the docking station, it doesn't helped at all.
So I decided to add error_capture=1 (record the
Whoops. We still have the functionality of rc6, just under a different name
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb6db0f5bf1d4d3a4af6242e287fa795221ec5b8
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This time I've added 'i915.enable_psr=0 i915.enable_dc=0 i915.enable_fbc=0' to
the kernel parameters. In the current session I had to manually reconnect the
notebook to the docking station and after a few seconds, the displays came back
to life. No flickering at all, it just took a little bit
Yes disabling multi-stream transport makes it a single stream, hence it
can only then drive a single monitor.
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Title:
i915.enable_dp_mst=0 seems to disable one of the external monitors.
$ modinfo i915 | grep enable_dp_mst
parm: enable_dp_mst:Enable multi-stream transport (MST) for new DisplayPort
sinks. (default: true) (bool)
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I just recently created another report
(https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1848123).
So I'm using an HP 840 G5, connected with USB TypeC to Dock G4 which feeds two
DP screens.
After each wake from S3 sleep, both displays are flickering and all the cores
are clocked to
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1550779
Title:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun
Status in linux
If someone else has those issues with a USB-C Dock (Thunderbolt 3) I got rid of
the issue by using the latest mainline Kernel:
5.1.0-050100-generic #201905052130 SMP Mon May 6 01:32:59 UTC 2019 x86_64
x86_64 x86_64 GNU/Linux
and the following Kernel config settings (/etc/default/grub):
I'm facing this issue in the latest kernel mainline, too.
CPU is an Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (which uses i915 graphics).
The graphic glitches were gone after some kernel update but the error messages
in dmesg remained.
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Since I'm also facing this bug I just want to confirm that the error
also occurs on the latest mainline Kernel (5.1) and also on the current
drm-tip kernel version (5.1.0.0994 from https://kernel.ubuntu.com
/~kernel-ppa/mainline/drm-tip/2019-05-05/)
I'm trying to use an additional monitor on my
I think this issue has been affecting me for a few years now but I just
recently started to look into it.
My current system is Ubuntu 19.04 but this issue was present even when I
was using 18.04 and 18.10 and even before that.
OS: Ubuntu 19.04
CPU: Intel Core i7 6700
Graphics (integrated only):
I suspect the Xorg modesetting driver's atomic logic might have
something to do with this. Can someone experiencing the problem please
try logging into 'Ubuntu on Wayland' and tell us if that avoids the
issue?
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
**
** Summary changed:
- [Lenovo ThinkPad X220] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
+ [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
** Tags removed: wily
** Tags added: bionic
** Tags added: xenial
** Changed in: linux (Ubuntu)
Status:
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