F22 Black Screen with nVidia drivers

[Richard Shaw]

On Mon, Jul 6, 2015 at 8:24 AM, Christopher Ross <fdra6390 at tebibyte.org>
wrote:

>
> Picking up the akmod failure I find this:
>
> root at snoopy 14:11:52 ~ # akmods --force
> Checking kmods exist for 4.0.6-300.fc22.x86_64             [  OK  ]
> Files needed for building modules against kernel
> 4.0.6-300.fc22.x86_64 could not be found as the following
> directories are missing:
> /usr/src/kernels/4.0.6-300.fc22.x86_64/
> /usr/lib/modules/4.0.6-300.fc22.x86_64/build/Is the correct[FAILED]devel
> package installed?
> root at snoopy 14:12:53 ~ #
> root at snoopy 14:20:05 ~ # la /usr/src/kernels/4.0.6-300.fc22.x86_64/
> ls: cannot access /usr/src/kernels/4.0.6-300.fc22.x86_64/: No such file or
> directory
> root at snoopy 14:20:17 ~ # la /usr/src/kernels/
> total 4.0K
> drwxr-xr-x. 22 root root 4.0K Jul  6 14:11 4.0.6-300.fc22.x86_64+debug
>
>
>
>
> So it cannot build the modules because there is no
> /usr/src/kernels/4.0.6-300.fc22.x86_64/
>
> But there is a 4.0.6-300.fc22.x86_64+debug
>
> Does this mean I installed the wrong kernel and/or headers? If so, it
> wasn't on purpose. I've never told dnf which kernels to install, it's
> always chosen that by itself.


I think you've been bitten by a recent bug that's cropped up with dnf. Yum
chose the shorted name by default that met a particular requirement so
kernel-devel was chosen over kernel-debug-devel, but dnf doesn't do this.
Dnf isn't "wrong" but it does create a serious inconvenience.

To make matters worse (I ran into this on a F21 laptop) if the debug kernel
is installed and loaded you can't uninstall it. You have to boot to a
previous kernel first.

Try this:
$ rpm -qa | grep kernel

If you see a bunch of debug packages then that's what's going on. You need
to reboot to a previous kernel, uninstall them, reboot to the new kernel
and install "kernel-devel".

Since I've gotten the question multiple times I'll reiterate here, I can't
just add "Requires: kernel-devel" to the akmods package because it doesn't
cover kernel variants such as a PAE kernel, etc.

The problem is both kernel-devel and kernel-debug-devel provide the same
capability and dnf chooses the debug package whereas yum chose the
non-debug package. I'm considering add a conflict with the debug package to
akmods but that means if you really WANT to install it and you have the
akmods package installed you can't have both at the same time.

Thanks,
Richard
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