Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.18 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc2-utopic/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- 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/1386867 Title: radeon fence failure reduces screen resolution Status in “linux” package in Ubuntu: Incomplete Bug description: While using Kubuntu 14.10 sometimes the screen blacks out for a few seconds and then comes back to life, but often with highly reduced resolution. The resolution of the screen actually seems to be fine (as evident by taking a screenshot) but things seem to get rendered on a much too small buffer and then streched to fit the screen (terrible upscaling?). Sorry I'm having a hard time explaining it, but see the attached screenshot. This actually happened multiple times. One time it logged me out of KDE, another time KDE stayed active but the resolution was reduced (or whatever this is) Attached is the output of dmesg, the relevant error seems to start here: [12105.193052] radeon 0000:01:00.0: ring 0 stalled for more than 10140msec [12105.193058] radeon 0000:01:00.0: GPU lockup (waiting for 0x00000000000dec08 last fence id 0x00000000000dec03 on ring 0) [12105.674184] radeon 0000:01:00.0: Saved 592 dwords of commands on ring 0. [12105.674320] radeon 0000:01:00.0: GPU softreset: 0x0000006C To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386867/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
