Black screen on boot

[AJSlye]

You have the steps wrong:
edit grub and remove quiet splash
press ctrl+x to continue the boot using those settings
when your at the black screen hit ctrl+f1.
do you have a login prompt?

[LNXlady]

You have the steps wrong:
edit grub and remove quiet splash
press ctrl+x to continue the boot using those settings
when your at the black screen hit ctrl+f1.
do you have a login prompt?

Oh, no I had already tried that. No prompt.

[AJSlye]

Do you get any terminal output with quiet splash?
You should see text scrolling like systemd xxxx, etc., etc..

[LNXlady]

Do you get any terminal output with quiet splash?
You should see text scrolling like systemd xxxx, etc., etc..

No, as soon as I hit ctrlx to boot, the screen blanks.

[AJSlye]

Then grub is not loading the kernel, systemd, etc.
You'll need to rescue the system, the easiest way to do this is with a live media.
You can either use the Maui install ISO, and install (use) the boot-repair tool:

Code:

sudo add-apt-repository -y ppa:yannubuntu/boot-repair; \
sudo apt-get update; \
sudo apt-get install -y --force-yes boot-repair && boot-repair

Or download the boot-repair-tool ISO and create a live USB with it:
https://sourceforge.net/projects/boot-repair-cd/

[LNXlady]

Then grub is not loading the kernel, systemd, etc.
You'll need to rescue the system, the easiest way to do this is with a live media.
You can either use the Maui install ISO, and install (use) the boot-repair tool:

Code:

sudo add-apt-repository -y ppa:yannubuntu/boot-repair; \
sudo apt-get update; \
sudo apt-get install -y --force-yes boot-repair && boot-repair

Or download the boot-repair-tool ISO and create a live USB with it:
https://sourceforge.net/projects/boot-repair-cd/

It didn't work exactly but it did improve things some. I used the dvd, it said it was repaired, I rebooted. Grub was no longer Maui themed but all my entries were there. However, it had added the radeon.modeset=0 back because it was still there even though I had removed it earlier. It booted and this time it DID let me change the resolution, so that is better, but it still isn't using the radeon drivers. It briefly flashed up something like, "No UMS support in Radeon Module" as it was loading. I rebooted and removed the radeon.modeset=0 to see if it would boot that way now but it just went back to the black screen. 
inxi says

Code:

Display Server: X.Org 1.18.3 drivers: ati,vesa (unloaded: fbdev,radeon)

 and the repair process gave me this pastebin url: http://paste2.org/7t0hW6ct
to post in case things still didn't work correctly.

[Pliny.D.Elder]

Must admit I have none (zilch) experience with radeon drivers.
So this is a bit obtuse to me.
https://wiki.freedesktop.org/xorg/RadeonFeature/
It mentions something about UMS about 15 lines down.
Seems a lot of people having problems with AMD/ATI Radeon but not a lot of solutions.
Good luck !

[LNXlady]

I've been running Netrunner since Dryland and will hate to go, even though I guess it isn't really Netrunner anymore. Netrunner 14 works fine on this computer but that is a bit old now. Should I just leave Maui installed in case a kernel update has a fix?This bug sounds like mine - https://bugs.launchpad.net/ubuntu/+sourc...ug/1568211
but it isn't assigned so I don't know if anyone is even looking for an answer.

[leszek]

Yeah seems to be the issue. Did you tried this here? https://bugs.launchpad.net/ubuntu/+sourc...omments/18

[LNXlady]

Yeah seems to be the issue. Did you tried this here?  https://bugs.launchpad.net/ubuntu/+sourc...omments/18

I saw that but didn't try it because the amdgpu driver isn't supposed to work with my card (I had checked earlier) and if I totally screw up the system I don't know enough to fix it.