Plymouth, Wayland not working under 4.15

[Michael Gratton]

I just upgraded to bionic from artful and the kernel's graphics stack seems to be hosed. I can get text consoles, but neither plymouth nor Wayland GDM sessions work.

X11 sessions do work however, e.g. by disabling Wayland for GDM3 in custom.conf or running startx from the console, however to get to that point you need to boot into a recovery session from the bootloader to avoid invoking the bootsplash, then proceed to boot normally from the recovery menu.

If I boot into the 4.13 kernel I had leftover from artful, everything works fine.

This is on a MacBookPro12,1 with an i7-5557U and Intel Iris 6100 (Broadwell GT3) integrated GPU.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-10-generic 4.15.0-10.11
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: mjg 1452 F.... pulseaudio
 /dev/snd/controlC0: mjg 1452 F.... pulseaudio
CurrentDesktop: GNOME
Date: Tue Mar 13 17:57:38 2018
InstallationDate: Installed on 2015-07-22 (965 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Apple Inc. MacBookPro12,1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-36-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash acpi_backlight=vendor i915.fastboot=1
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-36-generic N/A
 linux-backports-modules-4.13.0-36-generic N/A
 linux-firmware 1.172
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/24/2016
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP121.88Z.0167.B18.1610241407
dmi.board.name: Mac-E43C1C25D4880AD6
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro12,1
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-E43C1C25D4880AD6
dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B18.1610241407:bd10/24/2016:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6:
dmi.product.family: MacBook Pro
dmi.product.name: MacBookPro12,1
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)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.16 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/v4.16-rc4

[Michael Gratton (mjog)]

Running 4.16.0-041600rc4-generic right now, works fine.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the proposed kernel and post back if it resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed.

Thank you in advance!

[Michael Gratton (mjog)]

Is that kernel in main now? After adding proposed just now it doesn't seem to have any kernel packages.

I just installed linux-image-4.15.0-13-generic from main (4.15.0-13.14) however and rebooted with that and it seems to be working fine now. Cheers!