Hubert Hesse, to confirm this is resolved for you in Ubuntu, could you
please either upgrade your 16.04 enablement stack as per
https://wiki.ubuntu.com/Kernel/LTSEnablementStack or test
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?
** Tags removed: bios-outdated-1.42
**
shaju@678:~$ dmesg | grep i915
[2.088602] i915 :00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[2.103420] [drm] Initialized i915 1.6.0 20171023 for :00:02.0 on minor 0
[2.264884] i915 :00:02.0: fb0: inteldrmfb frame buffer device
[10947.8
shaju@678:~$ dmesg | grep i915
[2.088602] i915 :00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[2.103420] [drm] Initialized i915 1.6.0 20171023 for :00:02.0 on minor 0
[2.264884] i915 :00:02.0: fb0: inteldrmfb frame buffer device
[10947.8
This ticket is from 2016. A fifo underrun is a clear problem. I can reproduce
this easily with my external monitor.
What information do you need to look at this?
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description: Notebook
product: 81A4 (LENOVO_MT_81A4_BU_idea_FM_ideapad 120S-11IAP)
vendor: LENOVO
version: Lenovo ideapad 120S-11IAP
serial: YD033K9M
width: 64 bits
capabilities: smbios-3.0 dmi-3.0 vsyscall32
configuration: administrator_password=enabled boot=normal chas
[ 17.172263] snd_hda_intel :00:0e.0: bound :00:02.0 (ops
i915_audio_component_bind_ops [i915])
[ 17.177437] EDAC pnd2: b_cr_tolud_pci=08001 ret=0
[ 17.177495] EDAC pnd2: b_cr_touud_lo_pci=0 ret=0
[ 17.177536] EDAC pnd2: b_cr_touud_hi_pci=1 ret=0
[ 17.177577] E
Still happening on kernel 4.15.0-24
Xubuntu 18.04 LTS
Lenovo ThinkPad T480 on a dock and DP monitor connected.
Both screens go black when trying to unlock the session and I have to
restart the laptop.
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I have been experiencing this kind of problem (with
intel_cpu_fifo_underrun_irq_handler in syslog) for a couple of weeks now
on Ubuntu 17.10 (4.13.0-39-generic). Here's the syslog extract:
May 9 13:18:57 xx zeitgeist-datah[2322]: recent-manager-provider.vala:106:
(null) was not registered in
Still happening on 4.16.6 kernel for me.
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
To manage notifications about this bug
I am running Ubuntu 18.04 since about a month. No problems so far, until i made
an update 2 or 3 days ago. Since then i have the same problem. Messages in
dmesg with underrun, flickering screen etc.
It happens all the time. This happens on my htpc so i am not able to watch TV
longer than 5-10 mi
For me this manifests in lockups. The hardware buttons on my laptop
still work, fans etc. but xorg basically hard locks (Kernel 4.15.12).
There is no monitor in play.
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For me this manifests in lockups. The hardware buttons on my laptop
still work, fans etc. but xorg basically hard locks (Kernel 4.15.12)
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Title:
Like others, this still occurs on 4.15.13-041513-lowlatency with a clean
install of 16.04.
However, please note: It ONLY occurs if I am connected from my laptop's
docking station (HP 840 G2) to an external monitor (HDMI or DVI same
issue), AND the laptop lid is DOWN.
If the above is true i get th
This still occurs for me on kernel 4.15.12.
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
To manage notifications about this
@Tomasz Przybysz
i915.enable_rc6=0 as a workaround doesn't seem to work.
I have similar symptoms as Angelo Lisco. I leave laptop on overnight and
sometimes in the morning it got frozen with same underrun error message
in logs.
enable_rc6 is definitely set to 0:
$ cat /sys/class/drm/card0/power/rc
For Intel GLK user: There is a upstream bug opened and fixed:
https://bugs.freedesktop.org/show_bug.cgi?id=100302
And this patch works for me on Intel Gemini Lake platform:
https://github.com/torvalds/linux/commit/ed69cd40685c949ec9c65701758bbf9e6840240f
This patch is merged starting from v4.15-r
I'm testing Xubuntu 18.04 and have the same message in kern.log:
Mar 15 17:26:21 Xubuntu-18-04 kernel: [ 543.782137]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
I have experienced some "weird" screens.Please have a look here:
http://i.imgur.com/x2vCDj3.png
I keep experiencing this issue, using Ubuntu 17.10, an Intel Core
i3-5005U (with Intel HD 5500). It appears most often when a new
notification comes in (Slack/Spotify) and the lockscreen is visible.
>From dmesg:
[Fri Feb 23 13:51:50 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* C
I'm currently at kernel version 4.14.11 and the intel firmware drivers
installed from
https://01.org/linuxgraphics/downloads/firmware
which are:
kbl_guc_ver9_14.bin
bxt_guc_ver8_7.bin
kbl_dmc_ver1_01.bin
And the bug is still there. Although it wasn't manifesting itself until
I've connected an ext
Same issue here on a Lenovo T450s with a Intel HD Graphics 5500 (Broadwell GT2)
GPU. It happens both with Ubuntu 16.04 and Fedora (26 and 27) so I suppose
that's a weird bug in the intel driver.
It also happens sometimes without any external monitor when I leave my notebook
powered up during the
I see the problem on my Thinkpad T450 when I connect external display on
16.04 LTS with Linux kernel 4.13.0-26-generic:
dmesg -T | grep i915
[Thu Jan 18 15:24:30 2018] i915 :00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[Thu Jan 18 15:24:30 2018] [drm] Ini
Same issue here, DELL XPS 15 9560, I noticed the error because my Gnome
Lock screen clock "stops" at the point when I locked my screen.
Ubuntu 16.04, 4.13.0-26-generic
Looking at journalctl, the last message before the clock stopped is "Jan
15 10:21:05 hamide-XPS kernel: [drm:intel_cpu_fifo_under
I have the same or a similar problem on kernel version 4.13.4, Ubuntu
17.10.
Not sure whether it is exactly the same though. In syslog I see the FIFO
underrun message is preceded by a lot of other ERROR messages:
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.055663]
[drm:gen8_irq_handler [
I have the same problem.
XUbuntu 17.04 with kernel 4.13.0-17-generic #20-Ubuntu SMP Mon Nov 6
10:04:08 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Dec 6 18:06:47 HOSTNAME kernel: [205433.429560]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO
underrun
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I started seeing computer lockups with kernel 4.13.0 reporting a "fifo
underrun on pipe B" when a multiple monitor setup enters power save
state. It's nearly 100% reproducible. No issues with just the laptop
screen, without an external monitor.
I've just upgraded to 17.10. As 4.13.2 is reported to
I see graphic errors on external monitors and following messages in logs
with 4.13.0 kernel. Errors appear after laptop works for 3-4 days
without reboot.
kernel: [173125.746076] [drm:intel_set_cpu_fifo_underrun_reporting [i915]]
*ERROR* uncleared fifo underrun on pipe A
kernel: [173125.746104] [
I've just tried 4.13.2, screen is still blinking while on with the
default i915.enable_rc6=1.
There is an improvement though. On the kernel version 4.13 my laptop was
totally crashing after hitting caps-lock twice. Now this ridiculous one
is at least gone.
Although I still need to keep the rc6=0
Kernel 4.13.2 working fine for 2 days...
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
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Kernel 4.13.2 working ok for me, run for an hour without issue so far.
Will report back after more testing.
I hope 4.13 kernels will work well, they will be in the Ubuntu 17.10
series and it would be nice to get back off the mainline kernels!
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Just an update, setting a `i915.enable_rc6=0` kernel parameter helps and
the issue is gone but, as this switches of CPU and GPU energy saving,
it's rather a temporary workaround not a final solution.
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I'm on kernel 4.13 and got this error message as well.
The external monitor connected to laptop (Razer Blade Stealth) flickers a lot.
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Title:
[i9
Still seeing the error message on the following setup:
- Kernel: 4.12.0-041200-generic (downloaded from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12/)
- Ubuntu 17.04
- ThinkStation P310
[ 1130.350050] drm: not enough stolen space for compressed buffer (need
29491200 more bytes), disablin
Tried other distros and Kernel versions.
I can only boot to emergency mode.
Hardware problem...seems to me.
Memtest + HDD test etc marks no errors or failures
The system is only stable in graphics mode right after installation.
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@Chris; by starting my Dell Latitude 6410 this morning I see this FIFO
underrun error again booting into emergency mode.
Using 4.12rc4.
This is strange, because last Friday and Saturday I did not have any
problems.
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Update for those not following my other bug report
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695989)
I found the bug in all the 4.11 and 4.10, but not 4.12rc1 or 4.12rc4.
NOTE - @Jochen - I dont see the FIFO underrun error while running the
4.12 kernel.
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Tested it yesterday.
Had this bug with kubuntu 16.04.2 after kernel update and later on with an
update to kubuntu 17.04.
With 4.12.0-041200rc4-generic #201706042031 graphics/KDE works fine,
Installed the "all" headers and the kernel deb.
but this specific error is still listed in dmesg:
[3.
Hello all, (I wrote this on my bug report - here too so people see it!!)
OK. Good news - 4.12-0rc4 seems very stable (visually at least)
I have opened 3 terminal windows, have them running 'top' and other
commands so the window contents get updated, dragged them so they hang
half off the bottom o
Hi Chris (penalvch) - i have done as you asked.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695989
you should be subscribed to it.
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Chris (chrisonbuntu), it will help immensely if you use the computer the
problem is reproducible with, and file a new report with Ubuntu by using the
default repository kernel (not mainline/upstream/3rd party) via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
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I see the same issue on 17.04 running kernel 4.10.0-21
Firefox seems perfectly stable, but running other apps like Gnome-
Terminal, VLC and others I see black boxes, flashes and bars across the
screen. Often they come and go in a flash, but sometimes the whole
screen goes and the laptop shuts dow
@penalvch: I believe I'm experiencing the same issue. I've filed a
report where I've posted the results of ubuntu-bug linux.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1645876
I'll subscribe you to it if you aren't already on it.
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Caige Nichols (caiges), it will help immensely if you filed a new report with
the Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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I'm seeing this behavior on my Thinkpad x260:
[123678.466040] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[123742.876516] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update
failure on pipe A (start=214815 end=214816) time 150 us, min 1073, max 1079,
s
Issue is also gone for me since the latest kernel update to 4.4.0-38,
thanks to everyone involved!
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Title:
[i915]] *ERROR* CPU pipe A FIFO underr
4.4.0-38 seems to have done most of it for me. Could it have been resolved in
another package?
I only have FIFO underrun on pipe B when I check my dmesg (running for 4 days).
However, my computer is a macbook pro that needs to go around Apple soon for
other hardware issues, so i'm not sure to tr
After a couple of days with linxu 4.8.0 the problems are seems to be
gone. I just hope that it is an effect of a real change and not a timing
issue.
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Christopher M Penalver: There is an AskUbuntu issue for my particular
problem - something a lot like it - you can find it here:
http://askubuntu.com/questions/765364/kubuntu-16-04-sddm-login-screen-
hangs I've asked if they also saw the CPU underrun - no answer yet.
FWIW, I just installed xdiagnos
Alan Robertson, it will help immensely if you filed a new report with Ubuntu by
ensuring you have the package xdiagnose installed, and that you click the Yes
button for attaching additional debugging information running the following
from a terminal:
ubuntu-bug xorg
Also, please feel free to su
I just took some updates to a number of graphic libraries on 16.04, and
now I can't login to kubuntu. The symptom is that it takes my password
on the greeter screen, but never updates the screen after that.
The messages include these apparently related kernel messages:
kernel: [ 701.564034] [drm:
123vier (flowrist), it will help immensely if you filed a new report with the
Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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I'm experiencing the exact same issues, especially those of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/comments/43.
Upgraded from 15.10 to 16.04 (Linux 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
)
This makes my machine unusable and I'll h
gdi2k, it will help immensely if you filed a new report with the Ubuntu
repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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gdi2k, can you provide what kernel version did you test before 4.6.7
that had this bug?
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg g
Since upgrading to 16.04 on an X250 and T450s, I have had screen
blanking issues with external displays on both machines. When the screen
is more "active", such as when watching YouTube, the screen would go
blank for 2 - 3 secs, then come to life again. The more "active" screen
is the one that woul
bhat3 - I'm seeing the problem after upgrading to current 16.10. What do
you wan't me to try out on my system to track down the bug?
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Title:
[i91
@penalvch I understand and would like to identify it, but unfortunately
i can't trigger that bug on neither my x220 nor my x230 while all T450s
should have problems with external display and docking stations. With
linux-*-lts-* packages it will at least be resolved at least in autum :)
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bhat3, if one thinks they have identified a fix commit, they may test it
via
https://wiki.ubuntu.com/Kernel/KernelBisection#Testing_a_newly_released_patch_from_upstream
.
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@penalvch Thanks for the info, but can you assist us on how to test and
get a fix in xenial's kernel. I am out of kernel packaging since 2.6.33
and want to help to make xenial working on Thinkpads with docking
stations.
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Hubert Hesse, regarding your question, bisecting the Ubuntu kernel can
be tricky, hence you are better off refocusing onto the reverse bisect
of the mainline kernel to confirm the fix commit, and reverting it
causes the issue again.
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bhat3, unfortunately, we don't know if the commit fixes it, as it hasn't
been tested on the original reporter's (Hubert Hesse) hardware.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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@Hubert Of course it doesn't need a bisect when you already know the
commit the fixes it :) But i would sugest that we try to get it fixed in
xenial's kernel first. Unfortunately i can't assign the kernel team, can
you help out here?
** Changed in: linux (Ubuntu)
Status: Incomplete => Confi
I don't see the need for a bisect. To quote
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1522922/comments/125
"There's one thing I still don't understand... the root of the problem was
identified in https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25";
The associate
I actually switch back to my x230 and don't have the hardware for
testing, but we should really bisect this issue so the current xenial
kernel can be fixed.
Anyone who wants to help can test those kernels
https://wiki.ubuntu.com/Kernel/MainlineBuilds especially the late 4.4
and the early 4.5 i gue
Correct to my previous comment. After running on kernel
4.6.3-040603-generic I do still see the "funny repetition patterns (back
in time glitches)", but it seems less frequent. The other problems
(black screen and buffer underrun in dmesg) have not recurred.
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I was having this same problem running kernel 4.4.0-28-generic in 16.04.
Upgrading to kernel 4.6.3-040603-generic seems to have resolved the
problems (or at least made it rare enough that I don't notice it
anymore). On 4.4 the graphic errors were particular common (every few
seconds) when using got
Happens the same with 4.4.0-24-generic
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
To manage notifications about this bug g
While much less frequent than when using a 4.4 kernel, the problem still
occurs for me when using a 4.6 kernel:
uname -a
4.6.0-040600-generic #201606030904 SMP Fri Jun 3 13:06:01 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
dmesg
[31606.245708] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
@pavel See https://wiki.ubuntu.com/Kernel/MainlineBuilds and try which
newer kernel solves the issue.
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Title:
[i915]] *ERROR* CPU pipe A FIFO und
Linux xenie 4.4.0-24-generic #43-Ubuntu SMP
Intel® Core™ i3-4160 CPU @ 3.60GHz × 4
Ubuntu 16.04 LTS 64 bit
[Út čen 14 00:11:03 2016] vboxpci: IOMMU not found (not registered)
[Út čen 14 00:11:03 2016] nf_conntrack: automatic helper assignment is
deprecated and it will be removed soon. Use the
@Christopher To demand a full bisect for the status "confirmed" is IMHO
much over the edge, especially as it takes some time to trigger the bug.
@PocketSam Although Chrisopher's advice is right to follow, if you
gather the information with which mainline kernel the bug disapers it
would still be g
If I understand correctly we should install different linux kernel versions
untill we find a kernel, that fixes bug?
I'm a bit confused what link I should use to sort out kernels. Can you suggest,
please?
Try kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/ from v 4.4 to
4.6. ?
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Hubert Hesse, the next step is to fully reverse commit bisect from
kernel 4.5-rc5 to 4.6 in order to identify the last bad commit, followed
immediately by the first good one. Once this good commit has been
identified, it may be reviewed for backporting. Could you please do this
following
https://wi
** Tags removed: needs-bisect
** Tags added: kernel-fixed-upstream-4.6 needs-reverse-bisect
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xo
I can also confirm that upgrading to 16.04 and using a 4.6 kernel
(http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-yakkety/) solves the
issue for me.
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Hi all, I was bugged by this both in Ubuntu 16.04 (any 4.4 kernel after
release) and in ArchLinUX with all actual 4.5 kernels.
My solution was to take the 4.6 kernel on ArchLinUX (testing repository), after
which I was cured from all difficulties. If you use VirtualBox with a new
4.4/4.5 kernel
I'm still seeing the issue with latest:
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/current/
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.10-xenial/
Where other people report the issues are fixed for them
However not as severe as with 4.2.0-30.36
Can someone please advise w
** Attachment removed: "Снимок экрана от 2016-04-28 08-21-35.png"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/+attachment/4649672/+files/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%D0%BE%D1%82%202016-04-28%2008-21-35.png
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Christopher, I hope I did everything right.
Here is my new bug report:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1577099
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Title:
[i915
PocketSam, it will help immensely if you filed a new report with the Ubuntu
repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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Also a funny glitches happen with Google Documents very often.
** Attachment added: "Снимок экрана от 2016-04-28 08-21-35.png"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/+attachment/4649672/+files/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%
See https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1522922 Nothing really, except to stick with 4.1.21
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Title:
[i915]]
What can I do to help determine the cause of a problem or fix it?
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
To manage not
Still happening on Xenial with latest distro kernel:
[ 12.777803] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[ 12.777826] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
Linux hkgofdt02 4.4.0-21-generic #37-Ubuntu SMP
** Tags added: needs-bisect
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
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https
Same problem for me. I can easily reproduce a problem my moving mouse
over youtube video borders. If it's needed I can record a video. Should
I do that?
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** Tags removed: needs-bisect
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
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htt
Can anyone confirm the steps I took where all right?
What's the difference between the kernel I compiled and the officially
distributed one (4.2.0-27)? Any patches to reproduce the official binary?
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** Tags removed: latest-bios-1.40
** Tags added: bios-outdated-1.42
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
To manage n
any news on this?
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg g
So it turn out when I rebuild the package for 4.2.0-27 I already see
that glitches occurring in that specific kernel version. So it look like
there is difference between the package I built and the official package
or I screwed up the build process?
Here is what I did, I have to say the wik page y
Hubert Hesse, the next step is to fully commit bisect from kernel
4.2.0-27 to 4.2.0-30 in order to identify the last good kernel commit,
followed immediately by the first bad one. This will allow for a more
expedited analysis of the root cause of your issue. Could you please do
this following https
Ah no, I was to quick to judge. Now the error occurred with 4.5rc5, but it is
less frequent. And the quality of the glitches change.
No more repetition errors, just "regular" graphic errors.
$ dmesg | grep i915
[2.513449] i915: unknown parameter 'lvds_downclock' ignored
[2.743658] [drm] I
Hi Christopher,
4.5 rc5 has indeed fixed the issue for me. Thanks a lot :)
$ uname -a
Linux river 4.5.0-040500rc5-generic #201602201730 SMP Sat Feb 20 22:32:16 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep i915
[2.513449] i915: unknown parameter 'lvds_downclock' ignored
[2.7436
Hubert Hesse, in order to allow additional upstream developers to examine the
issue, at your earliest convenience, could you please test the latest upstream
kernel available from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ?
Please keep in mind the following:
1) The one to test is at
Ah, thanks for pointing out the BIOS update. However it didn't change
anything related to the issue.
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
8DET70WW (1.40 )
05/14/2015
The flickering is also present for me in the latest mainline
$uname -a
Linux river 4.4.3-040403-
Hubert Hesse, thank you for reporting this and helping make Ubuntu
better.
As per http://support.lenovo.com/us/en/products/Laptops-and-
netbooks/ThinkPad-X-Series-
laptops/ThinkPad-X220?linkTrack=GPS:Body_Search%20Products&beta=false an
update to your computer's buggy and outdated BIOS is availabl
Maybe a duplicate of https://bugs.launchpad.net/ubuntu/+source/xserver-
xorg-video-intel/+bug/1522922 ... weird that it only occurs in the
latest kernel package
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With the previous kernel I don't see the glitches nor the i915 underruns
$ uname -a
Linux river 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
$ dmesg | grep i915
[2.698444] [drm] Initialized i915 1.6.0 20150522 for :00:02.0 on minor 0
[2.76
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