Public bug reported:
Machine: Type: Laptop System: Acer product: Aspire A515-44 v: V1.02 serial:
<filter>
Mobo: RO model: Calla_RN v: V1.02 serial: <filter> UEFI: INSYDE v:
1.02
date: 03/23/2020
CPU: Topology: 8-Core model: AMD Ryzen 7 4700U with Radeon Graphics bits:
64 type: MCP
arch: Zen rev: 1 L2 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3
svm bogomips: 31939
Speed: 1397 MHz min/max: 1400/2000 MHz Core speeds (MHz): 1: 1397 2:
1397 3: 1397
4: 1396 5: 1863 6: 1863 7: 1863 8: 4180
Graphics: Device-1: AMD Renoir vendor: Acer Incorporated ALI driver: amdgpu v:
5.6.0.20.20
bus ID: 05:00.0 chip ID: 1002:1636
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati unloaded:
fbdev,modesetting,vesa
compositor: marco resolution: 1920x1080~60Hz, 2560x1080~60Hz
OpenGL: renderer: AMD Radeon Graphics v: 4.6.14736 Core Profile
Context 20.20
compat-v: 4.6.14736 direct render: Yes
If I use kernel linux-5.6.0.56, no external display is recognized.
With linux-5.6.0.54 it works.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1906452
Title:
5.4.0-56: External Display not recognized
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