@Ivan: There is a slight possibility that the patch could work for you (I don't know because I don't have that hardware). You could test by installing kernel 4.7 from mainline.
The probable cause of the flickering is PLL-resonance which only seems to affect LVDS and only on older GPU-chips. It is mitigated by switching off the fractional divider of the PLL when an LVDS is connected, which is exactly what the patch is doing for chips like RS780/880 (R600) and older. @everyone: The patch is in kernel 4.7 now so there is no need anymore to post your results here. Thank you all very much for what you posted thus far; It turned out to be quite helpful. If the patch is not working for you, you are probably hitting a different bug. Please commit a new bugreport in that case. -- 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
