Same problem here: Laptop is a HP 255 G6 based on AMD E2-9000e, Ubuntu
is 18.04 64 bits, kernel 4.15.0-45-generic, wide monitor is LG LG
25UM58-P, 2560x1080.

It does not always flicker, but it does when playing video or when using
applications in full screen mode (or in general when using most of the
surface of the wide screen). Monitor is connected through HDMI, other
monitors with lower resolutions do not flicker.

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  ubuntu 18.04 flickering screen with Radeon X1600

Status in linux package in Ubuntu:

Bug description:
  my laptop: HP Compaq nx9420
  my grafic card: 
  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
RV530/M56-P [Mobility Radeon X1600] (prog-if 00 [VGA controller])

  the bug-apport-file

  I start ubuntu 18.04 LTS (Kernel in textmode;
  -> as soon as the kernel-module radeon.ko is loaded the screen starts 
  when starting the grafic-mode the flickering continues; so the screen is 

  when setting the option "radeon.modeset=0" (thus: not use radeon drivers) the 
screen does not flicker
  but the resolution is limited to 1400x1050 (instead of natural 1680x1050)
  so I can not use this as work-around

  when using the old ubuntu 14.04.05 LTS (Kernel 3.13.0-157)
  the screen is o.k. NO flickering in textmode, nice grafic, NO flickering 
  xrandr tells: 1680x1050 60.1

  so I must stay on old ubuntu 14.04.05 ???

To manage notifications about this bug go to:

Mailing list:
Post to     :
Unsubscribe :
More help   :

Reply via email to