radeon module unloaded with 20.04 after upgrade from 18.04

[Daniel H]

I upgraded a computer running Ubuntu 18.04 with AMD ATI RS482/RS485 Radeon Xpress 1100/1150 without problem. After upgrade to 20.04, resolution is virtual size of 1400x1050 which doesn't fit in screen.

With 18.04 I had in xorg.o.log

[ 6647.940] (II) RADEON(0): Creating default Display subsection in Screen section
        "Default Screen Section" for depth/fbbpp 24/32
[ 6647.940] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
[ 6647.940] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
[ 6647.940] (==) RADEON(0): Default visual is TrueColor
[ 6647.940] (==) RADEON(0): RGB weight 888
[ 6647.940] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
[ 6647.940] (--) RADEON(0): Chipset: "ATI Radeon 3100 Graphics" (ChipID = 0x9611)
[ 6647.940] (II) Loading sub module "fb"
[ 6647.940] (II) LoadModule: "fb"
[ 6647.960] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 6647.971] (II) Module fb: vendor="X.Org Foundation"
[ 6647.971] compiled for 1.18.4, module version = 1.0.0
[ 6647.971] ABI class: X.Org ANSI C Emulation, version 0.4
[ 6647.971] (II) Loading sub module "dri2"
[ 6647.971] (II) LoadModule: "dri2"
[ 6647.971] (II) Module "dri2" already built-in
[ 6647.971] (II) Loading sub module "exa"
[ 6647.971] (II) LoadModule: "exa"
[ 6647.972] (II) Loading /usr/lib/xorg/modules/libexa.so
[ 6647.976] (II) Module exa: vendor="X.Org Foundation"
[ 6647.976] compiled for 1.18.4, module version = 2.6.0
[ 6647.976] ABI class: X.Org Video Driver, version 20.0
[ 6647.976] (II) RADEON(0): KMS Color Tiling: enabled
[ 6647.976] (II) RADEON(0): KMS Color Tiling 2D: enabled
[ 6647.976] (II) RADEON(0): KMS Pageflipping: enabled
[ 6647.976] (II) RADEON(0): SwapBuffers wait for vsync: enabled
[ 6648.008] (II) RADEON(0): Output VGA-0 has no monitor section
[...]

and now

[ 789.949] (II) FBDEV(0): using default device
[ 789.949] (==) FBDEV(0): Depth 24, (==) framebuffer bpp 32
[ 789.949] (==) FBDEV(0): RGB weight 888
[ 789.949] (==) FBDEV(0): Default visual is TrueColor
[ 789.949] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[ 789.949] (II) FBDEV(0): hardware: VESA VGA (video memory: 5760kB)
[ 789.949] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[ 789.949] (II) FBDEV(0): checking modes against framebuffer device...
[ 789.949] (II) FBDEV(0): checking modes against monitor...
[ 789.949] (II) FBDEV(0): Virtual size is 1400x1050 (pitch 1400)
[ 789.949] (**) FBDEV(0): Built-in mode "current": 147.0 MHz, 83.2 kHz, 77.4 Hz
[ 789.949] (II) FBDEV(0): Modeline "current"x0.0 147.04 1400 1432 1600 1768 1050 1054 1058 1074 -hsync -vsync -csync (83.2 kHz b)
[ 789.949] (==) FBDEV(0): DPI set to (96, 96)
[ 789.949] (II) Loading sub module "fb"
[ 789.949] (II) LoadModule: "fb"
[ 789.949] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 789.950] (II) Module fb: vendor="X.Org Foundation"
[ 789.950] compiled for 1.20.13, module version = 1.0.0
[ 789.950] ABI class: X.Org ANSI C Emulation, version 0.4
[ 789.950] (**) FBDEV(0): using shadow framebuffer
[ 789.950] (II) Loading sub module "shadow"
[ 789.950] (II) LoadModule: "shadow"
[ 789.962] (II) Loading /usr/lib/xorg/modules/libshadow.so
[ 789.962] (II) Module shadow: vendor="X.Org Foundation"
[ 789.962] compiled for 1.20.13, module version = 1.1.0
[ 789.962] ABI class: X.Org ANSI C Emulation, version 0.4
[ 789.962] (II) UnloadModule: "radeon"
[ 789.962] (II) Unloading radeon
[ 789.963] (II) UnloadModule: "modesetting"
[ 789.963] (II) Unloading modesetting
[...]

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.13.0-30.33~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-30-generic x86_64
.tmp.unity_support_test.1:

ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sat Feb 19 18:29:21 2022
DistUpgraded: 2021-03-08 13:38:14,332 DEBUG package 'libcpanel-json-xs-perl' produces an unwanted removal 'gnome-software-plugin-snap', skipping
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] RS482/RS485 [Radeon Xpress 1100/1150] [1002:5974] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company DC5750 Microtower [103c:280a]
   Subsystem: Hewlett-Packard Company RS480 [Radeon Xpress 1150] (Secondary) [103c:280b]
InstallationDate: Installed on 2015-11-26 (2276 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: Hewlett-Packard HP Compaq dc5750 Small Form Factor
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-30-generic root=UUID=681c938b-c95d-48de-886f-bc784bb57787 ro nomodeset quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to focal on 2021-03-08 (348 days ago)
dmi.bios.date: 01/25/2007
dmi.bios.release: 2.10
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786E3 v02.10
dmi.board.name: 0A64h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC8061JND
dmi.chassis.type: 4
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786E3v02.10:bd01/25/2007:br2.10:svnHewlett-Packard:pnHPCompaqdc5750SmallFormFactor:pvr:rvnHewlett-Packard:rn0A64h:rvr:cvnHewlett-Packard:ct4:cvr:skuEW318AV:
dmi.product.family: 103C_53307F
dmi.product.name: HP Compaq dc5750 Small Form Factor
dmi.product.sku: EW318AV
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
version.libdrm2: libdrm2 2.4.107-8ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.6-0ubuntu0.1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 21.2.6-0ubuntu0.1~20.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
xserver.bootTime: Sat Feb 19 18:19:48 2022
xserver.configfile: /etc/X11/xorg.conf
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input AT Translated Set 2 keyboard KEYBOARD, id 8
 input ImPS/2 Generic Wheel Mouse MOUSE, id 9
 input HP WMI hotkeys KEYBOARD, id 10
xserver.errors:
 No devices detected.
 open /dev/dri/card0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.20.13-1ubuntu1~20.04.2

[Daniel van Vugt (vanvugt)]

Xorg's radeon module unloaded because you have disabled the radeon hardware with the 'nomodeset' kernel parameter. You need to remove that. Make sure you're not accidentally booting in recovery mode.

[Dash (devel-tootai)]

Hi Daniel. Without the nomodeset kernel parameter, the graphical screen is blinking and unusable. In logs I have RADEON: Setting screen physical size to 508 x 285. In console mode it's OK.

[Dash (devel-tootai)]

FYI, no xorg.conf file is setted.

[Daniel van Vugt (vanvugt)]

This bug is closed but please open a new bug about:

> Without the nomodeset kernel parameter, the graphical screen is blinking and unusable

while that problem is happening. If you can't do so while the problem is happening then do so after it has happened and collect a log:

  journalctl -b-1 > prevboot.txt

and attach it to the new bug.

[Dash (devel-tootai)]

Bug #1961561