>From "-rc":
last works: v5.1-rc7
first not works: v5.2-rc1. 

>From non "-rc":
last works: v5.1.8
first not works: v5.1.9

I tried do bisection from your instruction, but I did it for a first
time and got too many errors while $ make -j`nproc` deb-pkg so I gave
up. Thank you for your help.

I'll stay with 5.1.8.

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  Graphic driver (radeon) screen problem in kernels released after

Status in linux package in Ubuntu:

Bug description:
  I've got a problem with some kernel modules (probably radeon) which cause 
screen problems. It occurs only on internal laptop screen.
  I found that problem is present in all kernels released after 2019-06-09 
18:25. Last kernel which works corectly is v4.19.49 2019-06-09 10:04. v5.2-rc4 
2019-06-09 18:25 has this bug and also v4.19.50 2019-06-11 13:06. So I think 
there are some changes in all kernel packages between hour 10:04 and 18:25 that 
day (2019-06-09) casue future problems.

  This may be problem with radeon modules cause screen goes strange when
  console shows "fb: switching to radeondrmfb from VESA VGA" (I remove
  "quiet splash" from GRUB menu).

  In this video I show described problem ->

  I've tested those kernels:

  *Works correctly:
  v4.19/ 2018-10-22 23:50
  v4.19.49/ 2019-06-09 10:04
  v5.0.1/ 2019-03-10 08:30
  v5.0.7/ 2019-04-05 22:40
  v5.0.21/ 2019-06-04 08:28
  v5.1.6/ 2019-05-31 15:32
  v5.1.8/ 2019-06-09 09:29

  *Not working correctly
  v4.14.163/ 2020-01-09 12:29
  v4.19.50/ 2019-06-11 13:06
  v4.19.94/ 2020-01-09 12:42
  v5.0.0-37/ 2019-11-14 12:06
  v5.1.9/ 2019-06-11 12:29
  v5.1.10/ 2019-06-15 11:30
  v5.1.11/ 2019-06-17 19:36
  v5.2-rc4/ 2019-06-09 18:25
  v5.2-rc5/ 2019-06-16 20:26

  Quick Hardware info:
  * Compal FL90
  * CPU: Intel Core 2 Duo T7500
  * GPU: AMD Rv620
  * System Description: Ubuntu 18.04.3 LTS x64 (xubuntu)
  * Kernel (works OK): 5.1.8-050108-generic #201906090832 SMP Sun Jun 9 
08:35:40 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
   /dev/snd/controlC0:  master     1305 F.... pulseaudio
   /dev/snd/controlC1:  master     1305 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 18.04
  MachineType: - N/A
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-37-generic 
root=UUID=e286c111-0a34-4f09-9d80-ebb947347f62 ro
  ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
   linux-restricted-modules-5.0.0-37-generic N/A
   linux-backports-modules-5.0.0-37-generic  N/A
   linux-firmware                            1.173.14
  Tags:  bionic
  Uname: Linux 5.0.0-37-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/18/2008
  dmi.bios.vendor: COMPAL
  dmi.bios.version: 1.18
  dmi.board.name: IFL90
  dmi.board.vendor: -
  dmi.board.version: IFT00
  dmi.chassis.asset.tag: -
  dmi.chassis.type: 10
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.product.family: Compal
  dmi.product.name: N/A
  dmi.product.sku: Compal
  dmi.product.version: N/A
  dmi.sys.vendor: -

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