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https://bugs.launchpad.net/bugs/1896378

Title:
  xubuntu kernel causes rectangular screen fluttering

Status in linux package in Ubuntu:
  New

Bug description:
  I had the same problem, exactly the same look with the latest kernel,
  of Xubuntu18 and also I tried UbuntuBudgie18, and both did the same.
  On my laptop (NC8000) the screen looks like someone has disrupted the
  pixels with little rectangular stuff. I had to go back a kernel via
  Grub and advanced options before I could read properly anything on the
  screen. And yes, I have just two 32 bit computers, although I also
  have 64 bit. But both 32 bit ones with the newest kernels for xubuntu
  or Budgie mess up the screen, and the kernel before that doesn't. I
  imagine that’s the case with all of the newer kernels with Kubuntu,
  Lubuntu etc..

  And the kernels are 5.0.037 which works. And 5.0.047 which has the
  distortion shared.

  here is the lshw -c video listings for the laptop (32 bit)

  *-display                
         description: VGA compatible controller
         product: RV350/M10 / RV360/M11 [Mobility Radeon 9600 (PRO) / 9700]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:01:00.0
         version: 00
         width: 32 bits
         clock: 66MHz
         capabilities: agp agp-2.0 pm vga_controller bus_master cap_list rom
         configuration: driver=radeon latency=64 mingnt=8
         resources: irq:10 memory:98000000-9fffffff ioport:2000(size=256) 
memory:90400000-9040ffff memory:c0000-dffff

  And here for the old Dell  32 bit desktop optiplex gx260

  
  *-display                
         description: VGA compatible controller
         product: RV200 [Radeon 7500/7500 LE]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:01:00.0
         version: 00
         width: 32 bits
         clock: 66MHz
         capabilities: agp agp-2.0 pm vga_controller bus_master cap_list rom
         configuration: driver=radeon latency=64 mingnt=8
         resources: irq:16 memory:f0000000-f7ffffff ioport:ec00(size=256) 
memory:ff8f0000-ff8fffff memory:c0000-dffff

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