So the change of cache mode for the VESA frambuffer driver is at least not the only offender. It might even have no impact at all but I would not be 100% sure, yet. Normally this sounds like something that needs a bisect (building various kernels at stages between 3.16.0-37 and 38 which you would have to try and report whether they work or not). Though that is quite tedious.
Some things that you might try before: - try the latest 3.16 (*-87*) with the mtrr option - try to switch to a text console (ctrl-alt-f1) and try to cause some load (scp or wget files, ssh,...) - if you got another Linux machine, try to install openssh-server on the laptop and attempt to ssh into the laptop when it appears frozen (sometimes it is just the graphical frontend and keyboard/mouse events that lock up). The other question would be whether it happens also if you just log in an let it sit idle (provided the screen saver does not kick in) or does it only happen if you do something (and if that is true, would this be things that cause network activity or rather local activity)? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-utopic in Ubuntu. https://bugs.launchpad.net/bugs/1561902 Title: Total system freeze after 3.16.0-38.52 Status in linux-lts-utopic package in Ubuntu: New Bug description: This should have been reported already last year, but here it goes. Problem: My laptop is a ASUS N71JA and works perfectly in Windows. Everything was fine with Xubuntu 14.04 through kernels 3.13 and 3.16 up to 3.16.0-38.52. Desktop freezes, like totally dies with hard power reset being the only option, every now and then from this kernel and onwards. This affects 3.19 and 4.2.0 kernels released after this date as well. No Magic SysRq possible and I can't see anything fancy in syslog or kern.log. Desktop can die anytime between immediately after boot or after a few hours, but it happens completely randomly and is hard to debug. Workaround: 3.16.0-38.52 was released in May 2015 (https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1452882). 3.16.0-37.51 and 3.16.0-36.48 have NEVER frozen. The only non-upstream change that was made to 3.16.0-38.52 was "vesafb: Set mtrr:3 (write-combining) as default" (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1434581). This is probably not implemented in the mainline kernel tree, right? I've been using mainline 3.16.7-ckt24-trusty without any problems now for over a month (http://kernel.ubuntu.com/~kernel- ppa/mainline/v3.16.7-ckt24-trusty/) i.e. it seems like 1434581 is causing the problem. Can this be verified by some other method e.g. by disabling/reverting 1434581 in a "normal" non-mainline kernel? Solution: ? --- ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: isak 1669 F.... pulseaudio /dev/snd/controlC0: isak 1669 F.... pulseaudio /dev/snd/controlC1: isak 1669 F.... pulseaudio CurrentDesktop: XFCE DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=188824e0-028f-4004-92b9-9e627eff4d5c MachineType: ASUSTeK Computer Inc. N71Ja Package: linux (not installed) ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-38-generic root=UUID=1d243640-e961-4ee3-b6d9-8e4ee5816090 ro quiet splash ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10 RelatedPackageVersions: linux-restricted-modules-3.16.0-38-generic N/A linux-backports-modules-3.16.0-38-generic N/A linux-firmware 1.127.20 Tags: trusty Uname: Linux 3.16.0-38-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers _MarkForUpload: True dmi.bios.date: 05/14/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: N71Ja.206 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: N71Ja 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.:bvrN71Ja.206:bd05/14/2010:svnASUSTeKComputerInc.:pnN71Ja:pvr1.0:rvnASUSTeKComputerInc.:rnN71Ja:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: N71Ja 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-lts-utopic/+bug/1561902/+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
