Public bug reported: Regression from 2.6.35 based Maverick kernels.
Single monitor attached to the machine via dvi (or hdmi via converter). It will display grub, or console output, but at about the point gdm starts the display goes black, and reports that no input is detected. This behavior exists in the 2.6.36, 2.6.37 and 2.6.38 upstream kernels as well. I bisected this problem to commit b599c0bca1e08a89a7fc4305bc84f4be30ada368 Author: Adam Jackson <<link:url>a...@redhat.com</link:url>> Date: Fri Jul 16 14:46:31 2010 -0400 drm/i915/hdmi: Set sync polarity based on actual mode Signed-off-by: Adam Jackson <<link:url>a...@redhat.com</link:url>> Signed-off-by: Eric Anholt <<link:url>e...@anholt.net</link:url>> However reverting this commit in later kernels does not result in the display functioning, and I have not traced it any further yet. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: linux-image-2.6.38-8-generic 2.6.38-8.42 Regression: Yes Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2 Uname: Linux 2.6.38-8-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23. Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gdm 1256 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfe8f8000 irq 46' Mixer name : 'Realtek ALC888' Components : 'HDA:10ec0888,104382a3,00100001' Controls : 27 Simple ctrls : 14 Date: Mon Apr 11 06:25:25 2011 HibernationDevice: RESUME=UUID=7b649748-05d3-4787-b8f5-e6d70d259bb4 InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007) MachineType: System manufacturer ASUS NOVA (P20/P22) ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=42a122a3-e749-4b29-96e6-7d97d0c73e0b ro crashkernel=384M-2G:64M,2G-:128M RelatedPackageVersions: linux-restricted-modules-2.6.38-8-generic N/A linux-backports-modules-2.6.38-8-generic N/A linux-firmware 1.50 SourcePackage: linux UpgradeStatus: Upgraded to natty on 2010-12-01 (131 days ago) dmi.bios.date: 04/14/2008 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0501 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: P2P5B1-DHS dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0501:bd04/14/2008:svnSystemmanufacturer:pnASUSNOVA(P20/P22):pvrSystemVersion:rvnASUSTeKComputerINC.:rnP2P5B1-DHS:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: ASUS NOVA (P20/P22) dmi.product.version: System Version dmi.sys.vendor: System manufacturer ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug kernel-graphics natty needs-upstream-testing regression-release -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/757549 Title: Monitor reports no input detected and goes into sleep mode -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs