I still have flickering problems with the X1300, kernel 5.4, Ubuntu 20.04. $ lspci | grep Radeon 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M52 [Mobility Radeon X1300] $ uname -r 5.4.0-33-generic $ lsb_release -r Release: 20.04
The display is a laptop panel on a Dell Inspiron 6400. $ xrandr LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm 1280x800 60.04*+ When the display wakes from sleep, it is "random" whether the flickering occurs or not. My workaround: use xrandr to force mode switches until the flickering goes away. For example, run the following command one or more times: $ xrandr -s 1 && xrandr -s 0 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1791312 Title: ubuntu 18.04 flickering screen with Radeon X1600 Status in Linux: Fix Released Status in linux package in Ubuntu: Confirmed Status in linux source package in Bionic: Fix Released Status in linux source package in Cosmic: Fix Committed Status in linux source package in Disco: Fix Released Bug description: === SRU Justification === [Impact] Screen flickers when using radeon.ko. It's a regression, it didn't happen on Trusty. [Fix] Quote the original commit log: "Instead of the closest reference divider prefer the lowest". [Test] Affected user confirms it fixes the issue. [Regression Potential] Low. Only affect radeaon, and it's in upstream stable tree. === Original Bug Report === 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]) attachment: the bug-apport-file Description: I start ubuntu 18.04 LTS (Kernel 4.15.0.33) in textmode; -> as soon as the kernel-module radeon.ko is loaded the screen starts flickering when starting the grafic-mode the flickering continues; so the screen is unusable. 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: https://bugs.launchpad.net/linux/+bug/1791312/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
