Hmmm, I don't remember, actually. When I got this machine, I installed from a 14.04 DVD, but immediately updated to 15.10 via 15.04 before I even really started using it. I don't remember it having hung in the few hours I had it run on 14.04 or 15.04 while setting things up, but I could be wrong. I noticed it pretty much immediately once I had 15.10 running, but it was much rarer then and I did not have time to go bug hunting immediately.
If it helps, however, I can confirm that the issue occurs with linux- image-extra-3.19.0-31-generic (version 3.19.0-31.36), as well, which is the latest image that is installed via linux-image-generic-lts-vivid on 15.10. Just as an addendum, the machine is stable when booted into Win 8.1, even under heavy graphics loads such as games, and now is under Ubuntu as well with intel_idle.max_cstate=1 , so I believe that hardware flakiness is unlikely to be the cause (especially since a lot of people are reporting the same issue, amenable to the same workaround, on a variety of different BayTrail-based hardware in the above kernel.org bug report). -- 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/1530557 Title: Random hard freezes under X on a laptop with Intel BayTrail processor (ASUS R752MA), Ubuntu 15.10 Status in linux package in Ubuntu: Incomplete Bug description: System freezes hard when working under X, sometimes after minutes, sometimes after hours. Usually, but not always, graphics-intensive applications like viewing videos will trigger the hangs after a while, but they can also (much more rarely) occur when e.g. only an xterm is opened and being worked in under Unity. The MagicSysReq keys are not functional any more once the hang has occurred, there is no information in the logs, and no crash dump can be obtained by using the soft or nmi watchdogs, panic_on_oops etc. I have tried the latest mainline kernel build from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D , linux- image-4.4.0-040400rc7-generic_4.4.0-040400rc7.201512272230_amd64.deb (4.4-rc7), and the hangs still occur under the same circumstances. Some research has led me to https://bugzilla.kernel.org/show_bug.cgi?id=109051 , and I believe that it describes the exact problem I am experiencing. WORKAROUND: Use kernel parameter: intel_idle.max_cstate=1 ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-22-generic 4.2.0-22.27 ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6 Uname: Linux 4.2.0-22-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tmm 2184 F.... pulseaudio CurrentDesktop: Unity Date: Sat Jan 2 16:56:51 2016 HibernationDevice: RESUME=UUID=f079f6d2-d58a-474c-ae48-d903be124a02 InstallationDate: Installed on 2015-10-21 (72 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) MachineType: ASUSTeK COMPUTER INC. X751MA ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=dbe91b1d-f01e-4f19-85eb-3877b67143ac ro quiet splash intel_idle.max_cstate=1 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.2.0-22-generic N/A linux-backports-modules-4.2.0-22-generic N/A linux-firmware 1.149.3 SourcePackage: linux UpgradeStatus: Upgraded to wily on 2015-10-23 (71 days ago) dmi.bios.date: 08/10/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: X751MA.403 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: X751MA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX751MA.403:bd08/10/2015:svnASUSTeKCOMPUTERINC.:pnX751MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX751MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: X751MA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530557/+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
