Just happened without those options. But I'm not sure if it's a kernel
bug, or a hardware/cable bug. Gotta investigate more I guess. It
certainly happened less, the last two days have been issue free, but
maybe I unplugged more and the cable got cleaner or something.
** Summary changed:
-
Marking this as Triaged / Low, as it seems to be only caused by these
unusual options.
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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** Summary changed:
- External monitor turns off for short period of times / until moving mouse
+ External monitor turns off for short period of times / until moving mouse
when using kernel options i915.enable_gvt=1 intel_iommu=on
** No longer affects: gnome-shell (Ubuntu)
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I had added i915.enable_gvt=1 intel_iommu=on on the kernel commandline
to enable Intel GVT-g, and connected an external monitor (with USB
devices attached, and supplying power to the laptop) via USB C.
It _seems_ that dropping the options makes it stable again, unless there
were some more
@Julian,
Could you please tell the detailed steps to reproduce this problem? It
looks like "you enabled the test with accelerated graphics in VMs", does
it introduce this issue?
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It might be a kernel bug related to get/iommu which I had enabled to
test with accelerated graphics in VMs. I think that the Kabylake are not
really supported for that yet. I turned those off now.
Switching desktop environments would be hard. I can't work in a
different de! My assumption was that
I don't think this is going to be a gnome-shell or mutter bug. But in
case it is, please test some other desktop environments to verify.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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Also, FYI: There are no log messages when the display turns on/off in
the journal.
** Description changed:
In disco; I have this issue where my external monitor (a ThinkVision
P24h-10) connected to my ThinkPad T480s turns off for short times while
actively working on the system. I noticed
** Attachment added: "Display-on debug state (b)"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1822854/+attachment/5252139/+files/b
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Interesting (?) difference between the i915 debug files:
--- display off
+++ display on
- Active context: [0] user_handle 0 hw_id 0, prio 0, ban score 0 (unbannable)
guilty 0 active 0
+ ELSP[0]: pid 12429, ban score 0, seqno5:010cd84c, prio
** Attachment added: "Display-off debug state"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1822854/+attachment/5252138/+files/a
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https://bugs.launchpad.net/bugs/1822854
** Attachment added: "head of dmesg (journalctl -k) for that boot"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1822854/+attachment/5252140/+files/dmesg-boot.txt
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