I'm experiening the same in 12.04.03 with the Raring kernel and X server filed a bug here with some possible workarounds: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1242013
-- 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/1165965 Title: External display stopped working Status in “linux” package in Ubuntu: Incomplete Bug description: After upgrading to 13.04 beta, my external monitor is no longer detected/driven. This works perfectly under 12.10, and is therefore a major regression impacting common use cases. When the Display Port/VGA adapter is plugged in dmesg reports 15 instances of: [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up Hardware: MacBook Air 2012 Display configuration: Apple Display Port to VGA adaptor Ubuntu version: 13.04 beta. --- ApportVersion: 2.9.2-0ubuntu5 Architecture: amd64 DistroRelease: Ubuntu 13.04 EcryptfsInUse: Yes InstallationDate: Installed on 2012-07-24 (258 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) MarkForUpload: True Package: linux (not installed) Tags: raring Uname: Linux 3.9.0-030900rc6-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: Upgraded to raring on 2013-04-07 (2 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1165965/+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
