This happened to me too, with geforce 9500m on lucid 64 bit. Oddly it would happpen some of the times. but not all of them. I found a workaround which might work for you too.
The messages in my kern.log say: May 20 01:29:52 aku kernel: [ 1613.675079] ACPI: PCI Interrupt Link [LPMU] enabled at IRQ 23 May 20 01:29:52 aku kernel: [ 1613.675084] nvidia 0000:00:03.5: PCI INT B -> Link[LPMU] -> GSI 23 (level, low) -> IRQ 23 May 20 01:29:52 aku kernel: [ 1613.675110] nvidia 0000:02:00.0: enabling device (0000 -> 0003) May 20 01:29:52 aku kernel: [ 1613.675120] nvidia 0000:02:00.0: PCI INT A -> Link[Z00Q] -> GSI 23 (level, low) -> IRQ 23 May 20 01:29:52 aku kernel: [ 1613.675144] vgaarb: device changed decodes: PCI:0000:02:00.0,olddecodes=io+mem,decodes=nonew ns=none May 20 01:29:52 aku kernel: [ 1613.675422] NVRM: The NVIDIA probe routine was not called for 1 device(s). May 20 01:29:52 aku kernel: [ 1613.675424] NVRM: This can occur when a driver such as rivafb, nvidiafb or May 20 01:29:52 aku kernel: [ 1613.675425] NVRM: rivatv was loaded and obtained ownership of the NVIDIA May 20 01:29:52 aku kernel: [ 1613.675425] NVRM: device(s). May 20 01:29:52 aku kernel: [ 1613.675427] NVRM: Try unloading the rivafb, nvidiafb or rivatv kernel module May 20 01:29:52 aku kernel: [ 1613.675428] NVRM: (and/or reconfigure your kernel without rivafb/nvidiafb May 20 01:29:52 aku kernel: [ 1613.675429] NVRM: support), then try loading the NVIDIA kernel module again. May 20 01:29:52 aku kernel: [ 1613.675431] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 195.36.15 Fri Mar 12 00:29:13 PST 2010 May 20 01:30:12 aku kernel: Kernel logging (proc) stopped. I think the problem is that for the sake of plymouth, ubuntu loads the vga16fb module before it loads the nvidia module. I solved it using the following workaround, which regrettably diables plymouth for nvidia folks: sudo gedit /etc/modprobe.d/blacklist.conf add the following lines to the end of the file: #Block modules messing with nvidia blacklist vga16fb blacklist nouveau blacklist rivafb blacklist nvidiafb blacklist rivatv -- [Test xpr-008] Lucid upgrade broke when upgrading from manually installed nvidia proprietary drivers https://bugs.launchpad.net/bugs/522328 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in ubuntu. _______________________________________________ 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
