Original Problem Root Cause: I have a dell inspirion laptop with amd Radeon 7700HD, and integrated Intel IvyBridge. At some point, prior to the "power-loss-induced shutdown" described in my previous comment. . . I believe I "played with" the switchable-graphics settings by using the aticonfig command, to switch from the Radeon to the Intel. I made this switch, and forgot.
I was using the 12.4 version of the Catalyst driver. Upon reboot, (in Ivybridge-mode), I encountered this system. (logon flashes a bunch of warning messages, including "broken pipe" - then returns you to the login screen, no matter which window-manager is chosen - even Unity 2d, even Gnome - no effects). When the .Xauthority file is chowned from root, back to my regular user account, I am able to log into Unity 2D. (however - now I've got a new problem: I can't get the Radeon 7700 HD to work again . . . ) I went through several cycles of uninstall and reinstall of the Catalyst driver (including upgrade to the new 12.8 version). I was able to reproduce the problem during BAD installs: (when I could not build the installer package, but instead, just ran the .run file) In this case - graphics is completely disabled, until I set /etc/X11/xorg.conf back to a failsafe vesa configuration. . . . and then - I still have the login/return issue, until I change ownership of .Xauthority from root to my user. More careful following of the install procedure on ATI's Catalyst wiki, produced a successful installation, including the ability to log into Unity 3D. So the main two points I want to make: 1. The symptom reported in THIS bug, (login fails, returns you to the login screen). . . 1a. . . . (is actually not related to the "broken pipe message" - that's something else. It is a coincidence that we can SEE this message during the login failure, but it is likely that this message was happening during a normal successful login anyway - I don't know exactly what's causing it. But my system is now working fine, and I'm still able to see this message for a brief-flicker). 1b. . . (the symptom can be worked-around by the following command, where your user is "username": sudo chown username:username ~/.Xauthority I *do not* understand why this file is being claimed by root, but I think it has something to do with the Catalyst driver, and switching graphics from a discrete to embedded gpu, and rebooting. I believe the "bug" may exist in 12.8 as well. Having .Xauthority owned by root is going to fubar the whole login process. It may be possible to uninstall Unity and login with gdm, and the reinstall Unity - I didn't try that. Seems a bit extreme anyway. 2. Following the EXACT procedure (including complete removal of prior installs, not just the fglrx, but also the xorg ati components) on the AMD Catalyst wiki for YOUR version of Ubuntu is absolutely necessary to get this driver to install properly. (for 12.04 - these instructions are here: http://wiki.cchtml.com/index.php/Ubuntu_Precise_Installation_Guide) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1036830 Title: Can't log in unless remove .Xauthority or use gdm Status in “lightdm” package in Ubuntu: New Bug description: On 8/13/2012 I updated ubuntu 12.10. Now when I try to log in the system flashes a black screen and then puts me back at the log in screen. Logging in as guest works. I tried adding a new user and cannot log in with that user either. I switched to gdm and logging in works fine. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: xorg 1:7.7+1ubuntu1 ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1 Uname: Linux 3.5.0-10-generic x86_64 ApportVersion: 2.4-0ubuntu6 Architecture: amd64 Date: Tue Aug 14 13:24:06 2012 DistUpgraded: Fresh install DistroCodename: quantal DistroVariant: ubuntu GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:04a9] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) MachineType: Dell Inc. Latitude E6220 ProcEnviron: LANGUAGE=en_US:en TERM=linux PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-10-generic root=UUID=94ff83ca-e880-49d3-8791-cdd2999ea806 ro quiet splash elevator=deadline vt.handoff=7 SourcePackage: xorg Symptom: display Title: Xorg crash UpgradeStatus: No upgrade log present (probably fresh install) XorgConf: section "Device" Identifier "Card0" Driver "intel" Option "AccelMethod" "sna" EndSection dmi.bios.date: 05/17/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: A08 dmi.board.name: 0D1CTR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA08:bd05/17/2012:svnDellInc.:pnLatitudeE6220:pvr01:rvnDellInc.:rn0D1CTR:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6220 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.8+bzr3249-0ubuntu2 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.38-0ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.12.1.902-1ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~really6.14.4-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.19.0-1ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.1-1build1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1036830/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
