Video cuts out after 3 seconds

[bwallum]

Using Desktop 19.04

When I start the computer the video is fine until it boots up Ubuntu. Then, after 3 seconds approximately the monitor is blanked. I can turn the monitor off and on again and it shows Ubuntu, again for 3 seconds then the same black screen. Ubuntu is running and I can log in, click report error button in pop up and log out, during multiple 3 second intervals between switching on the screen and Ubuntu blanking it.

I am currently using another computer to send this report.

Anybody else with the problem? Anybody worked out a fix?

[bwallum (rbw2)]

I have recovered my system by going into recovery mode from grub.

I then reset the graphics to generic. It took a few attempts to do the same thing before the graphics held up on the monitor as per normal usage. I then booted into Ubuntu Desktop, shut down, restarted and all was well.

[bwallum (rbw2)]

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] [1002:6779]
 Subsystem: ASUSTeK Computer Inc. Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] [1043:03da]
 Kernel driver in use: radeon
 Kernel modules: radeon
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM / R5 230/235/235X OEM] [1002:a...
 Subsystem: ASUSTeK Computer Inc. Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM / R5 230/235/235X OEM] [1043:aa98]
Linux bob-desktop 5.0.0-25-generic #26-Ubuntu SMP Thu Aug 1 12:04:58 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
/usr/lib/xorg/Xorg.wrap: Only console users are allowed to run the X server
[sudo] password for bob:
Hit:1 http://archive.ubuntu.com/ubuntu disco InRelease
Hit:2 http://archive.canonical.com/ubuntu disco InRelease
Get:3 http://archive.ubuntu.com/ubuntu disco-updates InRelease [97.5 kB]
Get:4 http://archive.ubuntu.com/ubuntu disco-backports InRelease [88.8 kB]
Get:5 http://archive.ubuntu.com/ubuntu disco-security InRelease [97.5 kB]
Get:6 http://archive.ubuntu.com/ubuntu disco-proposed InRelease [255 kB]
Fetched 539 kB in 1s (410 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
fbset is already the newest version (2.1-30).
hardinfo is already the newest version (0.5.1+git20180227-2).
inxi is already the newest version (3.0.33-1-0ubuntu1).
mesa-utils is already the newest version (8.4.0-1build1).
nux-tools is already the newest version (4.0.8+18.10.20180623-0ubuntu1).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
System:
  Host: bob-desktop Kernel: 5.0.0-25-generic x86_64 bits: 64
  Desktop: Gnome 3.32.2 Distro: Ubuntu 19.04 (Disco Dingo)
Machine:
  Type: Desktop Mobo: ASUSTeK model: M5A97 R2.0 v: Rev 1.xx
  serial: <root required> BIOS: American Megatrends v: 1903 date: 07/11/2013
CPU:
  Topology: 6-Core model: AMD FX-6300 bits: 64 type: MCP L2 cache: 2048 KiB
  Speed: 1401 MHz min/max: 1400/3500 MHz Core speeds (MHz): 1: 1400 2: 1395
  3: 1404 4: 1404 5: 1404 6: 1395
Graphics:
  Device-1: AMD Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
  driver: radeon v: kernel
  Display: x11 server: X.Org 1.20.4 driver: ati,radeon
  unloaded: fbdev,modesetting,vesa resolution: 1440x900~60Hz
  OpenGL: renderer: AMD CAICOS (DRM 2.50.0 / 5.0.0-25-generic LLVM 8.0.0)
  v: 3.3 Mesa 19.0.8
Audio:
  Device-1: AMD SBx00 Azalia driver: snd_hda_intel
  Device-2: Dynex 1.3MP Webcam type: USB driver: snd-usb-audio,uvcvideo
  Sound Server: ALSA v: k5.0.0-25-generic
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
  driver: r8169
  IF: eth0 state: up speed: 100 Mbps duplex: full mac: 60:a4:4c:59:78:1c
Drives:
  Local Storage: total: 968.80 GiB used: 93.94 GiB (9.7%)
  ID-1: /dev/sda vendor: OCZ model: VERTEX460 size: 111.79 GiB
  ID-2: /dev/sdb vendor: OCZ model: VERTEX460 size: 111.79 GiB
  ID-3: /dev/sdc vendor: Seagate model: ST3160815AS size: 149.05 GiB
  ID-4: /dev/sdd vendor: Hitachi model: HDT721064SLA360 size: 596.17 GiB
Partition:
  ID-1:...

[bwallum (rbw2)]

The fault returned and I swapped out monitor/pc with other units to narrow down the fault to the monitor. A new monitor has fixed the problem of losing the screen after 3 seconds or so.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 19.04 (disco) reached end-of-life on January 23, 2020.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.