Upgrade to Lucid, black screen, nomodeset not working.

[jfinner1]

I just upgraded to Lucid Lynx, and like most people, I'm getting the black screen during boot. So, I went into the grub edit screen, and I tried every variation of the nomodeset fix I could find. So far, nothing has worked. I don't know what graphics card I have, but it's always given me problems. Can anyone help?

[Cason]

Sometimes this is also caused by a processor problem. If that's the case, you could try either "processor.max_cstate=1" or "nohz=off" instead of "nomodeset". It doesn't sound like you need help making changes to your grub boot options, but if you do, I posted some directions here (http://ubuntuforums.org/showthread.php?t=1540340).

[jfinner1]

Neither of those worked either. One thing I noticed when I was looking through your instructions. In this line


linux /boot/vmlinuz-2.6.32-23-generic root=UUID=d2139a9e-b3ee-4684-a7ee-d654bbfcccd7 ro splash vga=789 quiet splash

I am missing the part that says "splash vga=789". I tried just typing it in, but nothing happened. Could that be effecting something?

[Cason]

No, I don't think that's the issue. The line is going to look slightly different depending on the individual computer and the kernel version that's running. I don't have any other ideas, but I'm newer to this than many people; hopefully someone else can help. :)

[oldfred]

Use this to see whta VGA controller you have:

lspci | grep VGA

fred@fred-desktop:~$ lspci | grep VGA
01:00.0 VGA compatible controller: nVidia Corporation G94 [GeForce 9600 GT] (rev a1)

They have obsoleted any VGA= settings:
vga=799 is a deprecated boot option
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/454993

Some other settings but it is best to know what video card you have:

Check BIOS for settings:
try to boot with acpi=off or nomodeset=0 on the boot line

Lucid 10.04 KMS
https://wiki.ubuntu.com/X/KernelModeSetting
# Nvidia (this should revert you to using -nv or -vesa):
echo options nouveau modeset=0 > /etc/modprobe.d/nouveau-kms.conf
Some other settings:
http://ubuntu-tutorials.com/2010/05/06/ubuntu-10-04-lucid-blank-screen-at-startup-workaround/

if you've got an intel graphics card, then the usual fix is to either add i915.modeset=1 or i915.modeset=0 to your boot
Other workarounds:
https://wiki.ubuntu.com/X/Bugs/Lucidi8xxFreezes
http://ubuntu-tutorials.com/2010/05/06/ubuntu-10-04-lucid-blank-screen-at-startup-workaround/

ATI/Radeon
https://help.ubuntu.com/community/RadeonDriver