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
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[Karmic] In KMS mode cannot get EDID from external monitor
https://bugs.launchpad.net/bugs/408127
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