I wonder if this is the same bug which I am seeing on my Dell Inspiron 6400 laptop with Radeon X1400 video. Occasionally I get white lines which are very similar to the https://www.youtube.com/watch?v=nx2-Fvihzxg video posted at the beginning. The only difference is that more lines are present at screen edges and high contrast borders. Line length and the way they flicker is very similar.
This problem has been present over multiple Ubuntu versions, and is still present in 64-bit Ubuntu 16.10 with kernel 4.8.0-26-generic. In the past I posted about the problem at: https://ubuntuforums.org/showthread.php?t=2322535 Sometimes I've gotten worse corruption like how Ivan Zakharyaschev (imz) wrote "sometimes the flickering did appear as some regions (with text) displayed at another place on the screen appearing extremely quickly and transparently also at a wrong places at the top." This is more rare than the white lines, and has not happened in Ubuntu 16.10 yet. Changing video modes can start or stop corruption. So, if I have corruption, run a script which uses xrandr to change to a lower resolution and back to the native resolution. This usually works in one try but sometimes takes a few tries. The problem happens rarely enough that it's not a big deal, but a fix would be nice. -- 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/1479136 Title: [ubuntu 14.04.2] Artefacts in radeon driver on kernel 3.16 and upwards Status in linux package in Ubuntu: Fix Committed Bug description: Ubuntu-Mate 14.04.2 This is what I get if I run a kernel newer than 3.13: https://www.youtube.com/watch?v=nx2-Fvihzxg sorry for the link, I just don't know how to describe these artefacts verbally. (a storm of small horizontal moving blips from right to left ??) Those artefacts appear as soon as new kernel is selected in GRUB, and remain during the whole session. The lastest kernel (from the main repository that is) working without artifacts is v3.13.0.59. All later kernels have artifacts. All later kernels also are either "-utopic" or "-vivid" instead of "-trusty", but I do not know if it is related. GPU: Mobility Radeon HD 3200 (RS780M) System: Ubuntu Mate 14.04.2 32-bit Kernels tested: 3.13.0.59 (and earlier) , 3.16.0.45 , 3.19.0.25 Only 3.13.0.59 (and earlier) are without problems. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479136/+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
