18.04.1 is using kernel version 4.4, please test with 20.04.1 which has
5.4.
** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1893820
Title:
DPLL2 override remains enabled after warm boot of Linux
Status in linux package in Ubuntu:
Incomplete
Bug description:
Ubuntu Version Target: 18.04.1 LTS (bootable Ubuntu USB stick)
Package Version Target: Unknown
Expected: Windows S3 Sleep actions with two DisplayPort monitors using
Intel integrated graphics should be able to work without issue after
entering a Windows OS from a previously loaded Ubuntu session
Actual: Windows S3 Sleep actions with two DisplayPort monitors using
Intel integrated graphics will result in a BSOD event if a Windows OS
is loaded after an Ubuntu OS session that was ended by a warm reboot
action
Description:
Using a dual-boot Ubuntu/Windows 10 desktop computer environment with two
native DisplayPort MB connections to the Intel integrated graphics solution and
two DisplayPort monitors it was observed that performing a Windows S3 Sleep
action will cause a "WHEA uncorrectable error" BSOD event if the first OS
loaded is Linux and the second OS Windows is loaded using a warm boot action.
Investigating this BSOD event further it was determined that this issue is
specific to the "Linux->warm boot->Windows->S3 Sleep" sequence as long as two
DisplayPort monitors are connected to the desktop computer's DisplayPort MB
connections.
A deeper investigation of the cause of the BSOD identified that upon
unloading Linux the DPLL2 override bit remains enabled and will cause a
subsequent Windows desktop environment to be vulnerable to failure if it makes
use of two DisplayPort-connected monitors.
This issue can be reproduced using OEM hardware from either of Lenovo, HP, or
Dell.
This issue was first observed on the Q270/Q370 Intel chipset and the Intel
530/630 Graphics hardware.
Calvin Hartwell of Canonical has been made aware of this issue and been
provided issue details and video evidence.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1893820/+subscriptions
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