** Changed in: linux (Ubuntu)
Status: Confirmed = Fix Released
** Changed in: hwe-next
Status: Confirmed = Fix Released
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Unable to reproduce this on 3.16 kernel with 201403-14891, a desktop
system with 14.04.2 stock image.
ubuntu@201403-14891:~$ uname -a
Linux 201403-14891 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@201403-14891:~$ lspci -nn | grep
Dell Inspiron 3147 - Redwood (CID 201403-14889)
with 14.04.2 fresh installation
with the same video chipset
00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics Display [8086:0f31] (rev 0e)
could NOT reproduce this issue.
screenshot inside
Hi Anthony,
I have verified with the drm-intel-nightly kernel (version 4.0.0-994) on
201403-14892, and it could get rid of the unknown display.
Thanks
** Changed in: hwe-next
Status: Incomplete = Confirmed
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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You
also test the current sru kernel available from trusty-updates, it
switched baytrail to use i915_bdw driver
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https://bugs.launchpad.net/bugs/1393651
Title:
[Dell Inspiron
** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Timo Aaltonen (tjaalton)
** Changed in: hwe-next
Assignee: (unassigned) = Timo Aaltonen (tjaalton)
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** Changed in: hwe-next
Importance: Undecided = Medium
** Changed in: linux (Ubuntu)
Assignee: Anthony Wong (anthonywong) = (unassigned)
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** Changed in: linux (Ubuntu)
Status: Confirmed = Incomplete
** Changed in: hwe-next
Status: Triaged = Incomplete
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https://bugs.launchpad.net/bugs/1393651
@Po-Hsu
Could you try drm-intel-nightly kernel at
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/current/ ?
If that still does not work, I will report this issue to upstream.
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** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
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https://bugs.launchpad.net/bugs/1393651
Title:
[Dell Inspiron 3531] Unknown display found in display
Confirmed with Ara, this should be considered as a blocker.
** Tags added: blocks-hwcert
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https://bugs.launchpad.net/bugs/1393651
Title:
[Dell Inspiron 3531] Unknown
** Changed in: hwe-next
Status: New = Triaged
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https://bugs.launchpad.net/bugs/1393651
Title:
[Dell Inspiron 3531] Unknown display found in display utility
Verified on 201403-14892
This issue does not exist in 3.5.0-54, 3.8.0-44
No display on 3.11 / 3.12 kernel, unable to test
Error message could be found in dmesg:
[ 42.575835] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
(can't even switch to console, but I can ssh to
Also affect 201404-14984 Dell Inspiron 3531, another Bay-Trail system
(with the same video controller, [8086:0f31])
** Tags added: 201404-14984
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A workaround to get rid of this Unknown display is to change:
GRUB_CMDLINE_LINUX=
into:
GRUB_CMDLINE_LINUX=video=VGA-1:d
(Since the bogus unknown display is connected to VGA1)
Run sudo update-grub and reboot
Reference:
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