Unfortunately, I was quite busy and didn't actually report the problem to upstream kernel yet... But here is an update hoping this may help someone who experiences the same problem to save some time
As I further noticed, freezes happend not only during resume but also sometimes due to inactivity display lock, or sometimes when I was just pressing the suspend menu item (before actually suspend happens). So I assumed something else might be going on other than the resume. Since my brightness didn't work either, my first focus went to it. I noticed I have two independent modules that attempt to manage the brightness: intel_backlight and dell_backlight. I also noticed that echoing different values into /sys/class/backlight/dell_backlight had no effect, so I balcklisted dell_laptop module in /etc/modprobe.d/blacklist.conf, and after reboot can no longer reproduce my issue. Hope this is it and I got to the source... My understanding is dell_laptop module was conflicting and causing the actual freeze. -- 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/1390807 Title: Dell 5737 freezes on ubuntu14 everytime during resume from suspend Status in linux package in Ubuntu: Triaged Bug description: My dell 5737 laptop was running all fine on 12.04. As soon as I upgraded to 14.04 I am consistenly running into system freeze everytime system attempts to resume from suspend. This happens when I simply close the lit of my laptop or due to screen inactivity suspend... When that happens only thing that works is hard reset. This is 100% reproducible. Interestingly, I noticed that on 3.11.10 kernel if I suspend manually from menu, the laptop resumes just fine. I tried pretty much all kernels upward including 12.04 ppa, even upgrading to 14.10 does not help. I am currently running 3.16.0-24-generic kernel. I even upgraded my BIOS to A10 (even though it was clearly stated optional on Dell site). When I boot using 3.11.10 kernel all is well except my virtualbox no longer functions then. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-24-generic 3.16.0-24.32 ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4 Uname: Linux 3.16.0-24-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: tigran 2677 F.... pulseaudio /dev/snd/controlC0: tigran 2677 F.... pulseaudio CurrentDesktop: Unity Date: Sat Nov 8 16:55:39 2014 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=13e6d588-5ce1-44fb-ba8a-2c65b9cf8b3d InstallationDate: Installed on 2014-03-25 (228 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Dell Inc. Inspiron 5737 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic.efi.signed root=UUID=8a7c9255-ff8b-4a86-b586-07d8695f44cc ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-24-generic N/A linux-backports-modules-3.16.0-24-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-10-28 (11 days ago) dmi.bios.date: 04/30/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A08 dmi.board.name: 04X8RP dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A08 dmi.modalias: dmi:bvnDellInc.:bvrA08:bd04/30/2014:svnDellInc.:pnInspiron5737:pvrA08:rvnDellInc.:rn04X8RP:rvrA00:cvnDellInc.:ct8:cvrA08: dmi.product.name: Inspiron 5737 dmi.product.version: A08 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1390807/+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
