I don't think this is an issue with a hardcoded constant in X, not unless someone recently made it much smaller. I hadn't seen this problem at all in 15+ years of using Linux/X, not until upgrading from 10.04LTS to 12.04LTS.
More likely it's a newly introduced resource leak in X or gnome. I'm using the nVidia driver. I hit this yesterday and had to log out/restart X, and I'm already hitting it again today. After killing everything except a single terminal and this instance of Firefox I notice out of 244 root window children over 160 instances of this sort: 0xc001b9 (has no name): () 238x196+842+518 +842+518 2 children: 0xc001ba (has no name): () 236x164+1+27 +843+545 0xc001bb (has no name): () 238x196+0+0 +842+518 They're all children of the root window. There are some duplicates, for instance (ignoring their 2 children): 0xc01660 (has no name): () 1077x1052+850+154 +850+154 0xc016b1 (has no name): () 1077x1052+324+118 +324+118 0xc017ea (has no name): () 1077x1052+850+154 +850+154 0xc01877 (has no name): () 1077x1052+850+154 +850+154 0xc018fb (has no name): () 1077x1052+850+154 +850+154 0xc01947 (has no name): () 1077x1052+850+154 +850+154 0xc019cc (has no name): () 1077x1052+850+154 +850+154 0xc01a45 (has no name): () 1077x1052+850+154 +850+154 I used to think it was xscreensaver, but I disabled that. I have no screensaver process running now. The only "strange" thing that might be related is a shell script I run that fires off xplanet every 5 minutes to generate a jpeg and then calls gconftool -t str -s /desktop/gnome/background/picture_filename <file.jpg> to update the background image. > xlsclients john gnome-session john gnome-settings-daemon john gnome-panel john gnome-fallback-mount-helper john rainlendar2 john polkit-gnome-authentication-agent-1 john devilspie john gtk-window-decorator john notify-osd john gdu-notification-daemon john telepathy-indicator john indicator-applet john gweather-applet-2 john indicator-applet-session john indicator-printers-service john evolution-alarm-notify john gnome-terminal john firefox Any suggestions on how to debug this would be appreciated. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to fglrx-installer in Ubuntu. https://bugs.launchpad.net/bugs/910539 Title: maximum number of clients reached To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/910539/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp