After some research I found errors related to i915 module (see some
output attached).
I tried some kernel module parameters without success, but the solution that
seems to work for me is disabling of SNA acceleration-backend following:
Martin Grewe, it will help immensely if you filed a new report via a terminal:
ubuntu-bug linux
Please feel free to subscribe me to it.
** Attachment removed: sleep_err_output.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301601/+attachment/4397940/+files/sleep_err_output.txt
--
I can confirm this bug on kernel 3.19.3-3 in arch linux using systemd
and laptop-mode-tools. Workaround 2 helps in most cases but I still got
freezes sometimes. So this certainly is not ubuntu-specific.
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Bugs, which is
** Tags added: utopic
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Title:
[Dell Latitude E7440] suspend sometimes freezes when lock screen
activates
To manage notifications about this
I still get lockscreen freezes with suspend and kernel 3.16.0-36-generic
(14.04 hardware enablement kernel).
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Title:
[Dell Latitude E7440]
This is still happens with latest kernel 3.13.0-45-generic in Ubuntu
14.04, when no workaround is in place.
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Title:
[Dell Latitude E7440]
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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I have the same problem. I will try the work around from Øyvind Stegard
(oyvinst). The problem is also on Windows so I think this is just a work
around.
Another problem is some time the keypress is repeat until I press another key.
Both on Ubuntu and Windows
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Lê Kiến Trúc 1301...@bugs.launchpad.net writes:
I have the same problem. I will try the work around from Øyvind
Stegard (oyvinst). The problem is also on Windows so I think this is
just a work around. Another problem is some time the keypress is
repeat until I press another key. Both on
A10 bios does not fix the freezing.
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Title:
[Dell Latitude E7440] suspend sometimes freezes when lock screen
activates
To manage
Samu Nuutamo, thank you for your comment. So your hardware and problem may be
tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into the default Ubuntu kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please read
** Tags removed: latest-bios-a10
** Tags added: bios-outdated-a10
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Title:
[Dell Latitude E7440] suspend sometimes freezes when lock screen
** Tags removed: latest-bios-a08
** Tags added: latest-bios-a10
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Title:
[Dell Latitude E7440] suspend sometimes freezes when lock screen
Console switch workaround is reliable and prevents possible hangs on
suspend when screen locking is enabled.
It's implemented with a simple script in
/etc/pm/sleep.d/99switch_to_vt1:
#!/bin/sh
# Possible workaround for bug:
# https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301601
#
#
Stalling suspend for a few seconds did not help. Now testing console
switch workaround (switch to VT-1 at suspend, then switch back to VT-7
at resume.). So far this is looking better, and it might be preventing
the hanging lock screen. Need to observe longer for any conclusions.
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I feel certain now that this is somehow connected to lock screen, so I
updated the bug title accordingly. Now on kernel 3.13.0-30-generic with
the problem still present. Currently testing a workaround where suspend
is stalled a few seconds by an /etc/pm/sleep.d script to allow
lockscreen fade
** Tags added: regression-potential
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Title:
[Dell Latitude E7440] suspend sometimes freezes when lock screen
activates
To manage
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