Per #17, bug seems to have been fixed in kernel 4.8. Closing
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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Title:
ThinkP
Please try latest mainline kernel in http://kernel.ubuntu.com/~kernel-
ppa/mainline/v4.15-rc6/
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Title:
ThinkPad X260 connecting external DisplayP
I have somewhat similar behavior on Lenovo T470p with external
displayport monitor connected via Thinkpad Ultra Dock on stock Ubuntu
17.04 (4.10.0-42-generic x86_64), but in my case it occurs after some
days of plugging in&out and ends with kernel panic (see screen photo).
** Attachment added: "ke
Current xenial linux-image-4.4.0-62-generic remains broken, with dmesg
WARNs on CRTC clocks and then system hangs when switching user sessions
(which invokes some gnome-session xrandr setup). Lost the exact dmesg on
the system hang.
Current mainline 4.8.x (4.8.17-040817-generic) continues to behav
Tero Marttila, to keep this relevant to upstream, one would want to
periodically check for, and test the latest mainline kernel (now
4.10-rc1) as it is released.
Could you please advise?
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
** Tags removed: kernel-bug-exists-upstrea
I've had good enough experiences with mainline 4.8.15 at this point that
I would consider this bug fixed in linux 4.8.x; it's still not perfect
(have to typically play around with xrandr and maybe undock/dock), but
external 4k DP monitor via a ThinkPad dock works fairly reliably now.
OTOH I was un
I've been running the 4.8.x mainline release kernels recently, and had
some success with 4k DP connected to the dock. It doesn't always work,
but a reboot fixes it, until it breaks again.
I'd appreciate advice for debugging this, it's pretty reproducible, but
typically when it happens I don't exac
We just installed a fresh X260 for a new coworker.
Can confirm that kernel 4.8.0-040800rc5 works even without
https://github.com/linuxenko/ubuntu-skylake-i915-video-fix
We do still have problems with the Lenovo Pro and Ultra docks. We cannot get
4K@60Hz working using any videooutput on the dock
I've been having more luck with the newer 4.7 and 4.8 kernels, and using
a 4k monitor on the integrated DP connector mostly works okay at 60Hz.
Haven't really noticed any difference in stability with the
xorg.conf.d/20-intel.conf settings in https://github.com/linuxenko
/ubuntu-skylake-i915-video-
Now I tried with the newest kernel 4.7.0-994-generic together with an
Xorg.conf.d fix from
https://github.com/linuxenko/ubuntu-skylake-i915-video-fix
It now works almost flawlessly over DP 4K 60hz.
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Tero Marttila, if you want your issue addressed as soon as possible, you
will want to create a net new report, indicating that you need the
commit(s) identified and backported to linux-stable so that it may be
included in Ubuntu.
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Hi first post here...
Just wanted to chime in and confirm same bug on same machine:
Thinkpad x260
Processor: Intel® Core™ i7-6500U CPU @ 2.50GHz × 4
Graphics: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
In order to try and fix the bug I have added the repo:
http://ppa.launchpad.net/oibaf/graphi
I found a couple existing bugs in the freedesktop.org tracker that might
be related, all marked as fixed in recent nightlies:
https://bugs.freedesktop.org/show_bug.cgi?id=96714
https://bugs.freedesktop.org/show_bug.cgi?id=95498
https://bugs.freedesktop.org/show_bug.cgi?id=94822
https://bugs.freede
Tero Marttila, the next step would be for upstream to identify and
submit the commit(s)that fixed your issue into linux-stable, where
Ubuntu pulls from. Hence, it would help speed this process up if you
filed a report following https://01.org/linuxgraphics/documentation/how-
report-bugs noting you
** Tags removed: kernel-bug-exists-upstream-4.7-rc5
** Tags added: kernel-bug-exists-upstream-4.7-rc6
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Title:
ThinkPad X260 connecting external D
I can confirm that linux-image 4.7.0-994-generic_4.7.0-994.201607052202
from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
nightly/2016-07-06/ behaves much better.
DP hotplug/unplug behaves correctly across text console, VT switch to
lightdm and login into Unity. There's still some WARN
Tero Marttila, to confirm this is reproducible upstream, could you
please test http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
nightly/ and advise to the results?
** Tags added: kernel-bug-exists-upstream-4.7-rc5 latest-bios-1.21
** Changed in: linux (Ubuntu)
Status: Confirmed =>
And no upgrades or prior working versions, this is a fresh Ubuntu 16.04
install on a newly purchased X260 laptop.
** Description changed:
Running Ubuntu 16.04 on a Lenovo ThinkPad X260 with Intel Skylake HD
Graphics 520, connecting an external monitor to the DisplayPort
connector causes the
As per the description, I have tested this with 4.4.0-28-generic as well
as mainline 4.6.3-040603-generic and 4.7.0-040700rc5-generic; they all
hang in a similar fashion.
In fact, the journal output I attached was from the 4.7 kernel, I
renamed the attachment accordingly: ubuntu16-04_linux4.7.0-0
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.7 kernel[0
Note that compared to #1559308 , connecting the same monitor via the
HDMI port on the laptop running 4.4.0-28-generic does seem to work fine:
There's still some stuff in dmesg when using HDMI as well:
snd_hda_codec_hdmi hdaudioC0D2: HDMI: ELD buf size is 0, force 128
snd_hda_codec_hdmi hdaudioC0D
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