23.04 installer display broken with fbdev on ppc64el

Hi,

latest cloud image ( Daily Build [20230405] : https://cloud-images.ubuntu.com/lunar/current/lunar-server-cloudimg-ppc64el.img ) , especially kernel 6.2.0-19-generic used, has the same issue as the
one I encountered on Debian : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033058 .
qemu vga output with fbdev gets stuck at kernel boot time while serial console looks ok till login prompt .

I guess it's going to propagate to http://cdimage.ubuntu.com/ubuntu-server/daily-live/current/lunar-live-server-ppc64el.iso soon.

I open this bug to monitor the upstream fix Cyril Brulebois proposed and hopefully get it into Ubuntu asap.

Thanks,
F.
---
ProblemType: Bug
.var.log.platform:

AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Apr 12 12:49 seq
 crw-rw---- 1 root audio 116, 33 Apr 12 12:49 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.26.0-0ubuntu2
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: unknown
CloudArchitecture: ppc64le
CloudBuildName: server
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSerial: 20230405
CloudSubPlatform: config-disk (/dev/sr0)
DistroRelease: Ubuntu 23.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci-vt:
 -[0000:00]-+-00.0 Device 1234:1111
            +-01.0 NEC Corporation uPD720200 USB 3.0 Host Controller
            \-02.0 Red Hat, Inc. Virtio network device
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Mouse
 Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Keyboard
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
     |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 480M
Package: linux (not installed)
PciMultimedia:

ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=vt220
 XDG_RUNTIME_DIR=<set>
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinux-6.2.0-19-generic root=LABEL=cloudimg-rootfs ro console=hvc0 earlyprintk
ProcLoadAvg: 0.06 0.05 0.02 1/109 938
ProcLocks:
 1: FLOCK ADVISORY WRITE 597 08:01:73471 0 EOF
 2: FLOCK ADVISORY WRITE 585 00:18:949 0 EOF
 3: POSIX ADVISORY WRITE 311 00:18:436 0 EOF
ProcSwaps: Filename Type Size Used Priority
ProcVersion: Linux version 6.2.0-19-generic (buildd@bos02-ppc64el-009) (powerpc64le-linux-gnu-gcc-12 (Ubuntu 12.2.0-17ubuntu1) 12.2.0, GNU ld (GNU Binutils for Ubuntu) 2.40) #19-Ubuntu SMP Sat Mar 25 10:13:41 UTC 2023
ProcVersionSignature: Ubuntu 6.2.0-19.19-generic 6.2.6
RelatedPackageVersions:
 linux-restricted-modules-6.2.0-19-generic N/A
 linux-backports-modules-6.2.0-19-generic N/A
 linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: cloud-image lunar
Uname: Linux 6.2.0-19-generic ppc64le
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
acpidump:

cpu_cores: Number of cores present = 1
cpu_coreson: Number of cores online = 1
cpu_dscr: DSCR is 0
cpu_freq:
 Tool Computed frequencies
 min : 2.293 GHz (cpu 0)
 max : 2.293 GHz (cpu 0)
 avg : 2.293 GHz
cpu_runmode: run-mode=0
cpu_smt: Error: command ['ppc64_cpu', '--smt'] failed with exit code 255: Machine is not SMT capable