Bug#920759: amdgpu+linux-images 4.9 & 4.19 crash randomly & always after X started
With kernel driver amdgpu & [AMD/ATI] Baffin [Polaris11] (radeon RX560).
Unfortunately new releases of kernel images crash too.
=> 4.19 is not anymore the solution vs 4.9.
linux-images 4.9 & 4.19 often (not systematically) crash randomly & always after X started (but I am seldomly a few minutes in console mode).
Usually within a few minutes after login.
I wonder why a version works, then a newer crashes, even with very different patch application dates, ex: 4.9.135 of 20-Oct-2018 works & 4.19.16 of 16-Jan-2019 works, whereas in between 4.9.144-1 of 08-Dec-2018 crashes.
CrashZ (T&C>10, T>C)= (B) + linux-image-4.19.0-0.bpo.4-amd64-unsigned 4.19.28-2~bpo9+1 = upstream 10-Mar-2019
Work (T>>10) = (B) + linux-image-4.19.0-0.bpo.2-amd64-unsigned 4.19.16-1~bpo9+1 = upstream 16-Jan-2019
CrashM (T=C=1) = (B) + linux-image-4.9.0-9-amd64 4.9.161-1 = upstream 27-Feb-2019
Crash = (A) + linux-image-4.9.0-8-amd64 4.9.144-1 = upstream 08-Dec-2018
Work = (A) + linux-image-4.9.0-8-amd64 4.9.135-1 = upstream 20-Oct-2018
CrashZ = hard crashes: Keyboard do not respond anymore & Magic SysRq key do not work.
CrashM = Magic SysRq keys work (and allow a safe reboot).
T=number of tests
C=number of crashes
(B) = (firmware-amd-graphics 20190114-1) + (1920x1200 59.95Hz 8bit per RGB = nothing special)
(A) = (firmware-amd-graphics 20161130-4)
PowerColor Red Dragon Radeon™ RX 560 16CU 2GB GDDR5 OC
RADEON RX 560
AXRX 560 2GBD5-DHV2/OC
'AMDGPU(0): Chipset: "POLARIS11" (ChipID = 0x67ff)'