I tried the glamor / tearfree - advice, but: with NO success; still flickering. And, btw.: I don't think the flickering is an Xorg-issue; it starts in "textmode" (!!) as soon as the radeon-kernel-driver loads. I think the kernel-driver does NOT read Xorg-configurations.
Just for fun, I've tested different systems: System kernel radeon.ko result UBUNTU-14.04.5 3.13.0-164 2.36.0 O.K puppy_slacko-6.3.2 3.14.55 2.37.0 O.K. UBCD 3.16.0 2.39.0 FLICKER UBUNTU 14.04.5 4.4.0-133 2.43.0 FLICKER UBUNTU 18.04.1 4.15.0-42 2.50.0 FLICKER So, I think the problem starts with a modification made in radeon.ko version 2.37.0 --> 2.39.0 Additionally I found a "kind of work-around": switch the mode several times! thus: - ignore flickering; start grafic mode - xrandr --output LVDS --mode 1440x900; sleep 2; xrandr --output LVDS --mode 1680x1050; - try that 2 ... 5 times until flickering stops! -- 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 package in Ubuntu: Confirmed 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]) 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/ubuntu/+source/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
