Hi Christopher, I knew this would take some time, but the result is in de git bisect log. Following the wiki I first did a mainline kernel reverse bisect from 3.13.11-ckt27 to v4.3-wily Last bad was v4.0.9-wily First good was v4.1-rc1-vivid
So after that I did a reverse commit bisect from 4.0 to 4.1-rc1 # first bad commit: [1d002fa720738bcd0bddb9178e9ea0773288e1dd] drm/dp: Use large transactions for I2C over AUX So since this commit the monitor is properly detected and resolution is correct. ** Attachment added: "git-reverse-bisect-LP1412730.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1412730/+attachment/4514743/+files/git-reverse-bisect-LP1412730.log -- 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/1412730 Title: DELL U2415 monitor detection issue Status in linux package in Ubuntu: Incomplete Bug description: My Laptop HP Elitebook 8740w has two external screens connected, 1 DELL U2412M connected to vga connector, and 1 DELL U2415 connected to Displayport. When booting up and with screens attached and active, the 2415 boots in 1024x768 resolution, the 2412 boots at the same moment in 1920x1200 as it should. At the point where the login screen appears the 2415 goes in power save mode, most of the time. After logging in, turning the 2415 off and on, sometimes helps the get the screen active (out of power save). When it gets active, the resolution is 1024x768, not 1920x1200. In unity-control-center in display settings the 2415 is displayed as "Unknown Display" and the maximum resolution I can select is 1024x768. Current partial workaround: xorg.conf with monitor section for 1920x1200 as in attachment. This doesn't solve booting in 1024x768, but solves the resolution after logging in. unity-control-center still lists "Unknown Screen" Tried Windows 8.1, no issues with both screens. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8 ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12 Uname: Linux 3.13.0-44-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3.6 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Tue Jan 20 10:48:24 2015 DistUpgraded: Fresh install DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: vboxhost, 4.3.20, 3.13.0-40-generic, x86_64: installed vboxhost, 4.3.20, 3.13.0-43-generic, x86_64: installed vboxhost, 4.3.20, 3.13.0-44-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Broadway XT [Mobility Radeon HD 5870] [1002:68a0] (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company FirePro M7820 [103c:1520] InstallationDate: Installed on 2014-05-11 (253 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Hewlett-Packard HP EliteBook 8740w PccardctlStatus: Socket 0: 3.3V 16-bit PC Card Subdevice 0 (function 0) bound to driver "pata_pcmcia" ProcKernelCmdLine: BOOT_IMAGE=/@trusty/boot/vmlinuz-3.13.0-44-generic root=UUID=cfafe8f3-4766-4fc7-b6f3-857eefcd2aff ro rootflags=subvol=@trusty plymouth:debug splash quiet drm.debug=0xe radeon.audio=1 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/07/2014 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68CAD Ver. F.50 dmi.board.name: 1520 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 33.31 dmi.chassis.asset.tag: CNU1152Q9W dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68CADVer.F.50:bd07/07/2014:svnHewlett-Packard:pnHPEliteBook8740w:pvr:rvnHewlett-Packard:rn1520:rvrKBCVersion33.31:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook 8740w dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.11.3+14.04.20141104-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.56-1~ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2 version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Tue Jan 20 09:37:08 2015 xserver.configfile: /etc/X11/xorg.conf xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.15.1-0ubuntu2.6 xserver.video_driver: radeon --- .tmp.unity.support.test.0: ApportVersion: 2.16.1-0ubuntu2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity DistUpgraded: Fresh install DistroCodename: vivid DistroRelease: Ubuntu 15.04 DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Broadway XT [Mobility Radeon HD 5870] [1002:68a0] (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company FirePro M7820 [103c:1520] InstallationDate: Installed on 2014-12-29 (59 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141224) MachineType: Hewlett-Packard HP EliteBook 8740w Package: xorg 1:7.7+7ubuntu2 PackageArchitecture: amd64 PccardctlStatus: Socket 0: 3.3V 16-bit PC Card Subdevice 0 (function 0) bound to driver "pata_pcmcia" PlymouthDebug: Error: [Errno 13] Permission denied: u'/var/log/plymouth-debug.log' ProcKernelCmdLine: BOOT_IMAGE=/@vividtesting/boot/vmlinuz-3.18.0-13-generic root=UUID=cfafe8f3-4766-4fc7-b6f3-857eefcd2aff ro rootflags=subvol=@vividtesting splash quiet drm.debug=0xe plymouth:debug ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5 Tags: vivid ubuntu reproducible compiz-0.9 Uname: Linux 3.18.0-13-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 07/07/2014 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68CAD Ver. F.50 dmi.board.name: 1520 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 33.31 dmi.chassis.asset.tag: CNU1152Q9W dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68CADVer.F.50:bd07/07/2014:svnHewlett-Packard:pnHPEliteBook8740w:pvr:rvnHewlett-Packard:rn1520:rvrKBCVersion33.31:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook 8740w dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.12.1+15.04.20150213-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.58-2 version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0~rc1-0ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0~rc1-0ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.16.2.901-1ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2 xserver.bootTime: Thu Feb 26 15:44:51 2015 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.16.2.901-1ubuntu4 xserver.video_driver: radeon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1412730/+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
