** Tags added: cscc
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https://bugs.launchpad.net/bugs/1643566
Title:
[i915_bpo] Intermittent display outage with external monitor
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Anybody who can still reproduce this particular problem?
** Changed in: linux (Ubuntu Xenial)
Status: Confirmed => Incomplete
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Title:
Seems to fixed in last update. Can anybody confirm?
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Title:
[i915_bpo] Intermittent display outage with external monitor
To manage
> We had, however, one machine which lost video signal ~one sec after lightdm
> showed up. X was still
> running (since I could login blindly via lightdm). The issue disappeared
> after we started
> benchmarking the machine. Can't reproduce anymore.
It turns out this issue was caused by a
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
** Changed in: linux (Ubuntu Xenial)
Status: Expired => Confirmed
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Hope the information helps, at least somebody else:
Exact same issue on Skylake-desktop PCs. Tested on 12 PCs in our pc lab.
Getting the trace in boot log on every single one. It appears short
after boot, by the time lightdm shows up. All machines run with two
displays.
MB/BIOS: MSI
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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[Expired for linux (Ubuntu Xenial) because there has been no activity
for 60 days.]
** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => Expired
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** Tags removed: kernel-key
** Tags added: kernel-da-key
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => Incomplete
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Not sure if this is a related issue. HP 850 G3 laptop with docking
station, external VGA connected.
If the display blanks for more than an instant, the external display
doesn't come back on until I undock and redock. This is OK:
$ xset dpms force off; xset dpms force on
This, on the other hand,
Hmm, no problems related to it in that log, i915 would be more verbose.
I just noticed the trace in the subject was caused by a lid close/open
and is most likely not related. It would be worth trying this out to
rule out the Intel X driver, save this as /etc/X11/xorg.conf
Section "Device"
** Attachment added: "4.8.0-31.33~16.04.1 dmesg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+attachment/4791210/+files/intel.txt
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Claire was able to retest with the 4.8.0-31.33~16.04.1 Yakkety HWE
kernel. She says the problem is still happening (ie. screen crashes and
goes blank after about 20min). She captured her dmesg output after
reproducing the issue with 4.8.0-31.33~16.04.1. I have attached it
here, but am not
** Description changed:
Filing on behalf of Claire Newman...
I seem to be tickling a bug in the i915 stack, when I use a desktop
monitor. The symptom is that the screen blanks for a few seconds then
comes back . This happens every few minutes. I am using a Lenovo
Thinkpad T460s (new
The full dmesg on the machine with a kernel newer than
4.8.0-28.30~16.04.1 after it happens and not just the trace would be
much appreciated as well. That patch series really should have fixed it.
The full /var/log/kern.log would work even better.
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The BIOS version on the machine I tested: N1CET38W (1.06)
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Title:
[i915_bpo] Intermittent display outage with external monitor
To manage
After installing the linux-generic-hwe-16.04-edge (comment #2) and
reboot, the 'uname -a' shows the kernel is 4.8.0-28-generic, and with
this kernel, I can't see any warnings in the dmesg and can't see "screen
blank" as well when connecting or disconnecting an external monitor.
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Tested with linux-4.4.0-51-generic, the kernel printed a warning in the
dmesg when connecting or disconnecting an external monitor (same as the
ones in the bug description), but can't see any "screen blanks".
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Tested with linux-3.19.0.75-generic, there are lots of warnings in the
dmesg when connecting a external monitor (same as the ones in the bug
description), but can't see any "screen blanks".
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Does it still show the same warnings in dmesg with 4.8.0-28.30~16.04.1?
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Title:
[i915_bpo] Intermittent display outage with external monitor
To
Pasting some of my commentary here
After further discussion with the team, I'm told this is a known issue
with Skylake. This should be resolved in v4.9 and backports have been
submitted to v4.8:
https://lists.freedesktop.org/archives/intel-
gfx/2016-October/109936.html
I have asked sabdfl
It would be good to know what type of activity causes this bug. Does it
happen only when using video in you're browser, such as youtube? Does
it only happen when using Google Hangouts? Or, can you trigger the
screen blanking when only using a single application, such as email?
** Tags added:
** Description changed:
Filing on behalf of Claire Newman...
I seem to be tickling a bug in the i915 stack, when I use a desktop
monitor. The symptom is that the screen blanks for a few seconds then
- comes back . This happens every few minutes, and in dmesg I see the
- below text.
+
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