Public bug reported: I have a macbook2,1 with intel 945 graphic chipset and an external monitor Samsung SyncMaster 174T. In jaunty the monitor was detected perfectly with proper name and modes. In karmic if the KMS is enabled it shows up as "UNKNOWN" monitor and the supported modes have nothing to do with reality. The monitor is capable for 1280x1...@60 however with KMS enabled xrandr gives resolutions like 1360x...@84. At the same time /var/log/messages is filled with messages like this: [ 159.060650] i2c-adapter i2c-3: unable to read EDID block. [ 159.060653] i915 0000:00:02.0: DVI-D-1: no EDID data When the KMS is disabled xrandr is properly detecting monitor name and modes.
I am also attaching verbose xrandr output, with KMS enabled and without. ProblemType: Bug Architecture: i386 Date: Mon Aug 3 00:29:15 2009 DistroRelease: Ubuntu 9.10 HibernationDevice: RESUME=UUID=13b81b96-28e2-40c8-9821-2ced96e2ab5b MachineType: Apple Inc. MacBook2,1 Package: linux-image-2.6.31-4-generic 2.6.31-4.23 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-4-generic root=UUID=fe5ba5be-96b7-4b75-90c5-0ece594ca155 ro quiet splash ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-4.23-generic RelatedPackageVersions: linux-backports-modules-2.6.31-4-generic N/A SourcePackage: linux Uname: Linux 2.6.31-4-generic i686 dmi.bios.date: 06/27/07 dmi.bios.vendor: Apple Inc. dmi.bios.version: MB21.88Z.00A5.B07.0706270922 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Mac-F4208CAA dmi.board.vendor: Apple Inc. dmi.board.version: PVT dmi.chassis.asset.tag: Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-F4208CAA dmi.modalias: dmi:bvnAppleInc.:bvrMB21.88Z.00A5.B07.0706270922:bd06/27/07:svnAppleInc.:pnMacBook2,1:pvr1.0:rvnAppleInc.:rnMac-F4208CAA:rvrPVT:cvnAppleInc.:ct10:cvrMac-F4208CAA: dmi.product.name: MacBook2,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 xorg-needs-kernel-fix -- [Karmic] In KMS mode cannot get EDID from external monitor https://bugs.launchpad.net/bugs/408127 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs