[MacBookAir6,2] Max resolution of external monitor degrades when upgrading from 13.10 to 14.04.1

Bug #1391984 reported by Paul Winkler on 2014-11-12
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
xorg (Ubuntu)
Medium
Unassigned

Bug Description

On a Macbook Air 2013 (6,2), I used to run Mint 16 XFCE (natively, not via virtualization), and had my external Samsung display happily running at its max resolution of 2560x1440 via a HDMI adapter.
I confirmed the same resolution can be obtained when booting Xubuntu 13.10 from USB.

I recently upgraded to Xubuntu 14.04.1 and now the external display will not run at anything higher than 1920x1200.
xrandr does not show anything higher than that available.
Confirmed the same issue exists in Mint 17 XFCE when booting from USB.

Note I am not sure if the kernel is in fact the issue, but such was suggested on this thread where I found what appears to be the same issue here:
http://ubuntuforums.org/showthread.php?t=2218618
... though without a resolution, and I am not a system76 customer.

xrandr output:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
   1440x900 60.0 + 59.9
   1360x768 59.8 60.0
   1152x864 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200 60.0
   1920x1080 60.0* 50.0 59.9
   1600x1200 60.0
   1680x1050 59.9
   1280x1024 75.0 60.0
   1440x900 59.9
   1280x960 60.0
   1280x800 59.9
   1152x864 75.0
   1280x720 60.0 50.0 59.9
   1024x768 75.1 70.1 60.0
   832x624 74.6
   800x600 72.2 75.0 60.3 56.2
   720x576 50.0
   720x480 60.0 59.9
   640x480 75.0 72.8 66.7 60.0 59.9
   720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Nov 12 12:46:52 2014
InstallationDate: Installed on 2014-11-09 (3 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: XFCE
DistUpgraded: Fresh install
DistroCodename: trusty
DistroRelease: Ubuntu 14.04
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a26] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:011b]
InstallationDate: Installed on 2014-11-09 (21 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
LightdmGreeterLog:
 ** (lightdm-gtk-greeter:1450): WARNING **: Failed to load user image: Failed to open file '/home/pw/.face': No such file or directory
 init: indicator-power main process (1574) killed by TERM signal
 init: indicator-application main process (1583) terminated with status 1
LightdmGreeterLogOld:
 ** (lightdm-gtk-greeter:1404): WARNING **: Failed to load user image: Failed to open file '/home/pw/.face': No such file or directory
 init: indicator-power main process (1542) killed by TERM signal
 init: indicator-application main process (1556) killed by TERM signal
MachineType: Apple Inc. MacBookAir6,2
NonfreeKernelModules: wl
Package: xorg 1:7.7+1ubuntu8
PackageArchitecture: amd64
ProcKernelCmdLine: \boot\vmlinuz-3.13.0-40-generic.efi.signed root=UUID=93f70a4c-7121-4395-a441-a288a38b846b ro $vt_handoff pcie_aspm=force i915.lvds_downclock=1 acpi_backlight=vendor initrd=boot\initrd.img-3.13.0-40-generic
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Tags: trusty ubuntu
Uname: Linux 3.13.0-40-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/24/2014
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA61.88Z.0099.B12.1405241030
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-7DF21CB3ED6977E5
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir6,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-7DF21CB3ED6977E5
dmi.modalias: dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B12.1405241030:bd05/24/2014:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
dmi.product.name: MacBookAir6,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Sun Nov 30 23:31:38 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 40176
 vendor APP
xserver.version: 2:1.15.1-0ubuntu2.1

Paul Winkler (slinkp) wrote :
Paul Winkler (slinkp) wrote :

Confirmed same resolution limitation exists in 14.10.

Paul Winkler, thank you for reporting this and helping make Ubuntu better. As it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg 1391984

Please ensure you have xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

Changed in xorg (Ubuntu):
importance: Undecided → Low
status: New → Incomplete
tags: added: regression-release utopic
Paul Winkler (slinkp) wrote :

Same in latest kernel (3.13.0-40-generic)

tags: added: apport-collected ubuntu
description: updated

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Paul Winkler, if you boot from a kernel in Saucy, are you able to then adjust to the desired resolution? Instructions on booting from prior Ubuntu kernels may be found at https://wiki.ubuntu.com/Kernel/KernelBisection .

summary: - Max resolution of external monitor degrades when upgrading from 13.10 to
- 14.04.1
+ [MacBookAir6,2] Max resolution of external monitor degrades when
+ upgrading from 13.10 to 14.04.1
Changed in xorg (Ubuntu):
importance: Low → Medium
Launchpad Janitor (janitor) wrote :

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]

Changed in xorg (Ubuntu):
status: Incomplete → Expired
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