[Bug 1865837] Re: Lubuntu 20.04 qa-test install; flashing at sddm greeter when mouse at top panel (pre-login)

[Chris Guiver]

** Description changed:

  First boot after new install; Lubuntu 20.04 QA-test install
+ dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)
  
  NOTE:  I re-used partitions, /dev/sda8 (/) was empty, but /dev/sda9
  (/home) contained data.  sddm wasn't used as DM before Lubuntu 20.04
  installs, so I doubt it's related to a conf/config issue relating to
  sddm.
  
  Description:
  
  At first boot, I expect the cursor to move around the display without
  bright flahes of WHITE covering parts of the screen; that are very
  bright/distracting (somewhat strobe like).
  
  It only has this effect when the cursor/pointer is moved at the top of
  the display in what I'd describe as a panel. If the cursor is over the
  'top' bar I get a strobbing effect as the cursor/pointer moves. Stop
  moving the mouse and the effect stops, move it off the top 'panel' and
  it's gone too.
  
  The 'flash' or 'strobe' like effects covers the whole screen, and occurs when the mouse is over
  - Session drop down box (not word itself, the Lubuntu drop-down bit)
  - Layout - US flag drop down
  - Pause/Reboot/Off icons top right.
  Elsewhere on the top 'panel' and there is no effect.
  
  It also occurs at the left arrow near the "Chris Guiver" password area,
  no issue if I move over white-grey-person-password area, just over the
  "<" to the left of that box.  This could be a real possibly should a
  person react to 'flashes' (I'm thinking epilepsy but just a thought).
  
  The screen appears to flash all WHITE with a triangle pushing out from
  the left (reminds me of screen tearing).  I haven't noticed this before
  on other boxes.
  
  On logging out, I get a brief strobe too before or as `ssdm` is drawn.
- 
  
  This could be filed again wrong package, I suspect it relates to
  xserver-xorg-video-radeon or something GPU related.
  
  `sudo lshw -C video` reports
  
  guiverc at d755-5-2004:~ $ sudo lshw -C video
  [sudo] password for guiverc:
    *-display:0
         description: VGA compatible controller
         product: RV516 [Radeon X1300/X1550 Series]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci at 0000:01:00.0
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
         configuration: driver=radeon latency=0
         resources: irq:16 memory:d0000000-dfffffff memory:fe9e0000-fe9effff ioport:dc00(size=256) memory:c0000-dffff
    *-display:1 UNCLAIMED
         description: Display controller
         product: RV516 [Radeon X1300/X1550 Series] (Secondary)
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0.1
         bus info: pci at 0000:01:00.1
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress bus_master cap_list
         configuration: latency=0
         resources: memory:fe9f0000-fe9fffff
  
  I did NOT expect two cards to be recognized?
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: sddm 0.18.1-1ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  ApportVersion: 2.20.11-0ubuntu18
  Architecture: amd64
  CurrentDesktop: LXQt
  Date: Tue Mar  3 18:48:23 2020
  InstallationDate: Installed on 2020-03-03 (0 days ago)
  InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200302)
  SourcePackage: sddm
  UpgradeStatus: No upgrade log present (probably fresh install)

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Title:
  Lubuntu 20.04 qa-test install; flashing at sddm greeter when mouse at
  top panel (pre-login)

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