Screen dim during encryption unlock prompt

[Joe Barnett]

In Artful, since 4.13 kernel, the screen gets super dim after the grub prompt while displaying the hard drive encryption unlock screen. Soon after unlocking the hard drive, the screen returns to normal brightness, but it's hard to even see that the unlock screen is being displayed.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-12-generic 4.13.0-12.13
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: jbarnett 2842 F.... pulseaudio
 /dev/snd/controlC3: jbarnett 2842 F.... pulseaudio
 /dev/snd/controlC0: jbarnett 2842 F.... pulseaudio
 /dev/snd/controlC1: jbarnett 2842 F.... pulseaudio
CurrentDesktop: GNOME
Date: Wed Oct 4 14:36:01 2017
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=dd225ec0-47f4-49d8-a51c-a2547f8eb945
InstallationDate: Installed on 2015-08-21 (775 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
MachineType: Apple Inc. MacBookPro11,4
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-12-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-12-generic N/A
 linux-backports-modules-4.13.0-12-generic N/A
 linux-firmware 1.168
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/05/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP114.88Z.0172.B04.1506051511
dmi.board.name: Mac-06F11FD93F0323C5
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,4
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-06F11FD93F0323C5
dmi.modalias: dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5:
dmi.product.family: MacBook Pro
dmi.product.name: MacBookPro11,4
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Does this issue go away if you boot back into the prior kernel?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc3

[Joe Barnett (thejoe)]

Reproduced on v4.14-rc7

[Kai-Heng Feng (kaihengfeng)]

As Joseph said, does this issue go away if you boot back into the prior kernel?

[Joe Barnett (thejoe)]

it does reproduce on 4.12.0-13. Not sure exactly what kernel I was running when it was last working, but will try a few more and report back after finishing testing mainline for a separate bug

[Andy Whitcroft (apw)]

This bug was nominated against a series that is no longer supported, ie artful. The bug task representing the artful nomination is being closed as Won't Fix.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.