This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1906452
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1906452
Title:
5.4.0-56: External Display not recognized
Status in linux package in Ubuntu:
Incomplete
Bug description:
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.
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