Public bug reported: OS: XUbuntu 14.10 amd64 with all updates installed.
Scenario: Using a multiseat setup with 2 graphics cards. Problem: User on non-primary seat (seat-1) uses xscreensaver to lock screen (light-locker not working correctly). When the screen is in power saving mode lightdm tries to spawn an extra X server at a rate of about 20 per second, apparently to show the greeter which would be used to unlock the session. >From the lightdm.log file: [+38145.59s] DEBUG: Seat seat-1: Stopping display server, no sessions require it [+38145.59s] DEBUG: Seat seat-1: Active display server stopped, starting greeter [+38145.59s] DEBUG: Seat seat-1: Creating greeter session [+38145.59s] DEBUG: Seat seat-1: Creating display server of type x [+38145.59s] DEBUG: Seat seat-1: Starting local X display [+38145.59s] DEBUG: DisplayServer x-2: Logging to /var/log/lightdm/x-2.log [+38145.59s] DEBUG: DisplayServer x-2: Writing X server authority to /var/run/lightdm/root/:2 [+38145.59s] DEBUG: DisplayServer x-2: Launching X Server [+38145.60s] DEBUG: Launching process 22681: /usr/bin/X -core :2 -seat seat-1 -sharevts -auth /var/run/lightdm/root/:2 -nolisten tcp [+38145.60s] DEBUG: DisplayServer x-2: Waiting for ready signal from X server :2 [+38145.69s] DEBUG: Process 22681 terminated with signal 6 [+38145.69s] DEBUG: DisplayServer x-2: X server stopped [+38145.69s] DEBUG: DisplayServer x-2: Removing X server authority /var/run/lightdm/root/:2 [+38145.69s] DEBUG: Seat seat-1: Display server stopped [+38145.69s] DEBUG: Seat seat-1: Stopping session [+38145.69s] DEBUG: Seat seat-1: Session stopped [+38145.69s] DEBUG: Seat seat-1: Stopping display server, no sessions require it [+38145.69s] DEBUG: Seat seat-1: Active display server stopped, starting greeter [+38145.69s] DEBUG: Seat seat-1: Creating greeter session [+38145.69s] DEBUG: Seat seat-1: Creating display server of type x [+38145.69s] DEBUG: Seat seat-1: Starting local X display and so on, filling up the disk with junk logs. >From the corresponding X server log: X.Org X Server 1.16.0 Release Date: 2014-07-16 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.2.0-54-generic x86_64 Ubuntu Current Operating System: Linux brho 3.16.0-28-generic #38-Ubuntu SMP Fri Dec 12 17:37:40 UTC 2014 x86_64 Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=e080193a-c36a-47f5-8f9b-cb8b5528fdd4 ro quiet splash vt.handoff=7 Build Date: 09 December 2014 11:01:03PM xorg-server 2:1.16.0-1ubuntu1.2 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.32.4 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.2.log", Time: Thu Jan 1 01:58:41 2015 (==) Using system config directory "/usr/share/X11/xorg.conf.d" (II) [KMS] Kernel modesetting enabled. (EE) Fatal server error: (EE) no screens found(EE) (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. (EE) Please also check the log file at "/var/log/Xorg.2.log" for additional information. (EE) (EE) Server terminated with error (1). Closing log file. and from /var/log/Xorg.2.log: [ 38270.601] (II) modesetting: Driver for Modesetting Kernel Drivers: kms [ 38270.601] (II) FBDEV: driver for framebuffer: fbdev [ 38270.601] (II) VESA: driver for VESA chipsets: vesa [ 38270.601] (II) [KMS] Kernel modesetting enabled. [ 38270.601] (WW) Falling back to old probe method for modesetting [ 38270.601] (WW) Falling back to old probe method for fbdev [ 38270.601] (II) Loading sub module "fbdevhw" [ 38270.601] (II) LoadModule: "fbdevhw" [ 38270.601] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 38270.601] (II) Module fbdevhw: vendor="X.Org Foundation" [ 38270.601] compiled for 1.16.0, module version = 0.0.2 [ 38270.601] ABI class: X.Org Video Driver, version 18.0 [ 38270.601] (WW) Falling back to old probe method for vesa [ 38270.601] (II) RADEON(0): Creating default Display subsection in Screen section "Default Screen Section" for depth/fbbpp 24/32 [ 38270.601] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32 [ 38270.601] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps) [ 38270.601] (==) RADEON(0): Default visual is TrueColor [ 38270.601] (==) RADEON(0): RGB weight 888 [ 38270.601] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC) [ 38270.601] (--) RADEON(0): Chipset: "ATI Radeon HD 3450" (ChipID = 0x95c5) [ 38270.601] (EE) RADEON(0): [drm] failed to set drm interface version. [ 38270.601] (EE) RADEON(0): Kernel modesetting setup failed [ 38270.601] (II) UnloadModule: "radeon" [ 38270.601] (EE) Screen(s) found, but none have a usable configuration. [ 38270.601] (EE) Fatal server error: [ 38270.601] (EE) no screens found(EE) [ 38270.601] (EE) kernel log shows nothing at the times indicated. Expected behaviour: Should be able to start X server that shows a greeter. According to https://lists.launchpad.net/ubuntu-multiseat/msg00505.html this should work in utopic. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: lightdm 1.12.1-0ubuntu1 ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1 Uname: Linux 3.16.0-28-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 Date: Thu Jan 1 01:50:25 2015 InstallationDate: Installed on 2014-12-26 (5 days ago) InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: lightdm (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug utopic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1406834 Title: lightdm spawning X servers at high rate on secondary seat in multiseat setup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1406834/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
