5.8 kernel appears to break video in two groovy installs

Bug #1890211 reported by Fritz Hudnut on 2020-08-03
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

Ran apt to update/upgrade in both of my groovy distros, Lubuntu & U-MATE 20.10 . . . on reboot not only was my grub list broken in both cases but seemingly the update to the new 5.8.0-12 kernel shows splash logo, but "logs" to a black screen. Display power light is "on" but screen is black.

I repeated this several times in both systems . . . having to boot using SG2 to another distro to repair grub . . . then after I did that I got to grub list and went to "advanced options" and rolled back to the prior 5.4.0-42 kernel . . . and GUI is operational.

I believe in TW I am running 5.7 kernel and that system has video. I have an Nvidia card and I'm using "nouveau" as my driver.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.4.0-42-generic 5.4.0-42.46
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu43
Architecture: amd64
 /dev/snd/controlC1: non-space2 1665 F.... pulseaudio
 /dev/snd/controlC0: non-space2 1665 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Mon Aug 3 15:45:08 2020
InstallationDate: Installed on 2019-06-17 (413 days ago)
InstallationMedia: Lubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
 lo no wireless extensions.

 enp9s0 no wireless extensions.

 enp10s0 no wireless extensions.
MachineType: Apple Inc. MacPro5,1
ProcFB: 0 nouveaudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=17bcb813-d05e-4cc3-bcdf-16d283156780 ro quiet splash resume=UUID=f9ae531f-ec45-4a13-a75d-d3fd4cd80fe0
 linux-restricted-modules-5.4.0-42-generic N/A
 linux-backports-modules-5.4.0-42-generic N/A
 linux-firmware 1.189
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2019-12-13 (234 days ago)
dmi.bios.date: 07/30/2018
dmi.bios.vendor: Apple Inc.
dmi.board.asset.tag: 0
dmi.board.name: Mac-F221BEC8
dmi.board.vendor: Apple Inc.
dmi.chassis.type: 7
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F221BEC8
dmi.modalias: dmi:bvnAppleInc.:bvr138.,1:pvr0.0:rvnAppleInc.:rnMac-F221BEC8:rvr:cvnAppleInc.:ct7:cvrMac-F221BEC8:
dmi.product.family: MacPro
dmi.product.name: MacPro5,1
dmi.product.sku: System SKU#
dmi.product.version: 0.0
dmi.sys.vendor: Apple Inc.

Fritz Hudnut (este-el-paz) wrote :
Fritz Hudnut (este-el-paz) wrote :

Forgot to mention that when I'm booted in the 5.8 kernel with the black screen, when I hit the power button the splash for both U-MATE && Lubuntu return to the screen before then powering down.

So we are moving from visible splash to black to visible splash to . . . powering down.

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
Fritz Hudnut (este-el-paz) wrote :

Today my Tumbleweed distro upgraded to the kernel and on reboot video is working and I'm typing this post via the 5.8 kernel . . . . So either the ubuntu apt pre-release version of the kernel is higher up than this one, OR, there was some other package that caused the problems in the two ubuntu distros that I have installed.

Both have been rolled back to "un-pre-release" and the grub listings have worked themselves out so that the 5.4 kernels are now default . . . .

Kai-Heng Feng (kaihengfeng) wrote :

What upstream stable version is "" based on?

Fritz Hudnut (este-el-paz) wrote :

@Kai-Heng Feng:

When I posted that I was comparing my Tumbleweed kernel which is running 5.8 with the two ubuntu installs . . . that seemed to break when they bounced up to 5.8. The two ubuntu distros are now running something like 5.4 . . . because I unchecked the "pre-release packages" box . . . .

Checking the "pre-release packages" box brought in the 5.8 kernel into the two ubuntu installs, but caused problems with video . . . . I assumed at the time that it was "the kernel" . . . . There are quite a few system reports posted in this thread, but I don't think any of them show the system when it was using the 5.8 kernel . . . because nothing could be seen . . . .

Today I'm back in my Tumbleweed install, that system is running the 5.8 kernel . . . and it is working well . . . much faster than the 5.4 kernels that my ubuntu installs are . . . etc.

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