Hi Werner,
The fix for this bug hasn't been released yet, so kernel 4.15.0-54 is
expected to still have the issue. A new kernel version containing the
fix is planned to be published to -proposed this week and an automated
comment will be added when the new version is available for testing.
Meanwhile please keep the tasks as 'Fix Committed' to correct reflect
their current status.
Thank you.
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Fix Committed
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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 Committed
Status in linux source package in Cosmic:
Fix Committed
Status in linux source package in Disco:
Fix Committed
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 ???
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