You have been subscribed to a public bug:
After upgrading LTS kernel and X server from 12.04 to 12.04.03, my
external monitor is no longer detected/driven. This worked perfectly
under 12.04, and is therefore a major regression impacting common use
cases. Does not affect the Display Port to DVI-D connection with the
same display.
When the Display Port/VGA adapter is plugged in dmesg reports several:
[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
When booting with the VGA adaptor connected, dmesg is flooded with these
and the trackpad does not work.
I'm an experienced user but new to filing bugs. Feel free to ask for
more information.
Work arounds:
Boot using 12.04 kernel (vmlinuz-3.2.0-54-generic) caveat: VGA works as
1024x768 or 800x600 out of the box but you dont need to know/find/add modlines.
or
Add the modline manually and enable using xrandr. This is less reliable, only
works sometimes in my experience and the external monitor has some weird
behaviour - no background and right click on the background appears only the
primary display.
//copy the modline from HDMI1 (DVI-D label in xrandr) to DP1 (or manually
create the modline for your display):
xrandr --addmode DP1 1920x1080
//connect the DP to VGA cable, removing the DP to DVI, run:
xrandr --output DP1 --above eDP1 --mode 1920x1080
Hardware: MacBook Air 5,2 Mid 2012
Display configuration: Apple Display Port to VGA adaptor
Ubuntu version: 12.04.3
with linux-lts-raring xserver-xorg-lts-raring
xserver-xorg-video-intel-lts-raring.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-31-generic 3.8.0-31.46~precise1
ProcVersionSignature: Ubuntu 3.8.0-31.46~precise1-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic x86_64
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-31-generic.
ApportVersion: 2.0.1-0ubuntu17.5
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: Cirrus Analog [Cirrus Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: shah 2374 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xa0610000 irq 23'
Mixer name : 'Intel PantherPoint HDMI'
Components : 'HDA:10134206,106b5600,00100302
HDA:80862806,80860101,00100000'
Controls : 37
Simple ctrls : 10
Date: Sat Oct 19 11:34:54 2013
HibernationDevice: RESUME=UUID=363970cc-f00e-4fc5-9ad4-85835761f881
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64
(20120823.1)
MachineType: Apple Inc. MacBookAir5,2
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-31-generic
root=UUID=546e99ab-1217-4a80-9242-a78138929e8f ro
crashkernel=384M-2G:64M,2G-:128M quiet i915.i915_enable_rc6=1 resume=/dev/sda6
noapic
RelatedPackageVersions:
linux-restricted-modules-3.8.0-31-generic N/A
linux-backports-modules-3.8.0-31-generic N/A
linux-firmware 1.79.7
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/27/2012
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA51.88Z.00EF.B02.1211271028
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-2E6FAB96566FE58C
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir5,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-2E6FAB96566FE58C
dmi.modalias:
dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B02.1211271028:bd11/27/2012:svnAppleInc.:pnMacBookAir5,2:pvr1.0:rvnAppleInc.:rnMac-2E6FAB96566FE58C:rvrMacBookAir5,2:cvnAppleInc.:ct10:cvrMac-2E6FAB96566FE58C:
dmi.product.name: MacBookAir5,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: xorg-lts-raring (Ubuntu)
Importance: Medium
Status: New
** Tags: amd64 apport-bug kernel-fixed-upstream-v3.12-rc6 precise
regression-release
--
[Macbook Air 5,2] External monitor not working 12.04 - Display Port to VGA,
xserver-xorg-lts-raring, Intel HD 4000 graphics
https://bugs.launchpad.net/bugs/1242013
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