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[Bug 1882112] [NEW] [radeon] Screen freeze


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This may be correlated to the move to Bionic Beaver(?) LTS, now 18.04.4.
It may also be correlated to getting low on disk space on my system
drive (50GB SSD) and putting pressure on swap space. e.g when system HDD
<= 1GB.   My secondary HDD is a 1TB USB spinning device that sometimes
seems to go into sleep mode and then fails to rapidly respond to IO
request or may be is in a 'hot IO' state. On my Bus I have a low
capacity HDD that is essentially unused because it rarely comes ready
when I boot.  If it is partially alive it is conceivable that it might
be chattering and so competing for IO interrupt handling bandwidth?

The problem only occurs when I have selected the desktop management tile
from the 'side tray' and if I then shuffle or better align the windows
inside one of the four desktops so as to stop them running into the
neighbouring desktop area. Particularly, it seems to me, when at least
one of the desktops is quite busy with windows open in it and the
overlapped desktop has a few also.  The fewer windows in total across
the desktops the less likely it seems that rearranging a few will have
any bad effect.

When the freeze occurs then 60%(?) of the time it ends in a 'big red
switch' reboot.  The cursor stays active but ineffective.  Keyboard
combinations, like Alt+W, will sometimes succeed in bringing up to full
screen mode and active the desktop that was in focus and constitutes a
recovery.  Other times, and keys, will delete focussed windows in the
focussed desktop, and Tab will move focus around the 4 desktops.
SHIFT+Print Screen also executes but just takes the whole screen and
dumps it somewhere I haven't yet located... with sound effect.

Hope this helps... I am not at fully at home with Ubuntu/Linux yet... having spent a lifetime on glasshouse legacy IBM mainframe field systems engineering.  I am making myself more system disk space meanwhile, and while extract my old Maxtor.  It would be nice if I didn't have to up my system disk to hundreds of GB!   
best regards,

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-101.102-generic 4.15.18
Uname: Linux 4.15.0-101-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Thu Jun  4 11:31:56 2020
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GpuHangFrequency: Several times a week
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: I don't know
 Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7480D] [1002:9993] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Trinity [Radeon HD 7480D] [1043:8526]
InstallationDate: Installed on 2016-11-27 (1284 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-101-generic root=UUID=1d959d4a-ac83-43a5-8c0f-a6956d68c1f8 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/10/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0802
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: A55BM-E
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0802:bd10/10/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnA55BM-E:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:
version.libdrm2: libdrm2 2.4.99-1ubuntu1~18.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.8-0ubuntu0~18.04.3
version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.8-0ubuntu0~18.04.3
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Sat Aug 18 06:53:30 2018
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.7
xserver.video_driver: radeon

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic compiz-0.9 freeze radeon ubuntu
[radeon] Screen freeze
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