Bug#867701: Radeon HD 6450, black screen, cursor, no console

[Ivan Sergio Borgonovo <ivan.s.b@gmail.com>]

On 07/16/2017 05:56 PM, Michel Dänzer wrote:

> Hmm, the string "EGL search path is" and the corresponding code was 
> removed upstream for Mesa 10.6. Look for instances of libEGL.so.1* other 
> than /usr/lib/x86_64-linux-gnu/libEGL.so.1* on your system and see if 
> removing those helps.

I'm not sure about what you're asking.

On the problematic system apparently there are no packages installed 
containing libEGL*.*

apt-file search libEGL.so
libegl1-glvnd-nvidia: /usr/lib/x86_64-linux-gnu/nvidia/current/libEGL.so.1
libegl1-mesa: /usr/lib/x86_64-linux-gnu/libEGL.so.1
libegl1-mesa: /usr/lib/x86_64-linux-gnu/libEGL.so.1.0.0
libegl1-mesa-dev: /usr/lib/x86_64-linux-gnu/libEGL.so
libegl1-nvidia: /usr/lib/x86_64-linux-gnu/nvidia/current/libEGL.so.1
libegl1-nvidia: /usr/lib/x86_64-linux-gnu/nvidia/current/libEGL.so.375.66
libegl1-nvidia-legacy-340xx: 
/usr/lib/x86_64-linux-gnu/nvidia/legacy-340xx/libEGL.so.1
libegl1-nvidia-legacy-340xx: 
/usr/lib/x86_64-linux-gnu/nvidia/legacy-340xx/libEGL.so.340.102
virtualbox-guest-x11: /usr/lib/virtualbox/additions/libEGL.so
virtualbox-guest-x11: /usr/lib/virtualbox/additions/libEGL.so.1

but none of these packages are installed.

But
find /usr/lib/x86_64-linux-gnu/ -name libEGL*.*
/usr/lib/x86_64-linux-gnu/libEGL.so.1
/usr/lib/x86_64-linux-gnu/libEGL.so.1.0.0

ls -l /usr/lib/x86_64-linux-gnu/libEGL.so.1
lrwxrwxrwx 1 root root 15 Jul 17 00:57 
/usr/lib/x86_64-linux-gnu/libEGL.so.1 -> libEGL.so.1.0.0

aptitude reinstall glx-alternative-mesa
update-alternatives: warning: forcing reinstallation of alternative 
/usr/lib/mesa-diverted because link group glx is broken

On the working box I get:
find /usr/lib/x86_64-linux-gnu/ -name libEGL*.*
/usr/lib/x86_64-linux-gnu/libEGL.so.1

ls -l /usr/lib/x86_64-linux-gnu/libEGL.so.1
lrwxrwxrwx 1 root root 51 Jun 10  2016 
/usr/lib/x86_64-linux-gnu/libEGL.so.1 -> 
/etc/alternatives/glx--libEGL.so.1-x86_64-linux-gnu

> > > > > Does the same problem happen with 1:7.8.0-1+b1 with
> > > > >
> > > > >      Option "AccelMethod" "glamor"
> > > > >
> > > > > in /etc/X11/xorg.conf ?
> > > >
> > > > Older xserver-xorg-video-radeon with that option DOESN'T WORK.
> > > > Black screen, text cursor at the top right corner ( _ ).
> > >
> > > Right, as expected the problem is specific to glamor, which is the
> > > default for your GPU in 7.9.0 but wasn't yet in 7.8.0. This means in the
> > > worst case you can work around the problem with
> > >
> > >     Option    "AccelMethod" "EXA"
> > >
> > > in /etc/X11/xorg.conf.
> >
> > Thanks, this solved the problem.
> >
> > Could I suggest to add some notes in the changelog before closing the 
> > bug?
>
> It's just a workaround. We don't know yet what the problem is, though 
> it's likely specific to your system.

Are you saying it is something more related to the installation history 
of that box rather then to the specific hardware?
Or it cold be a mix of the two?

Could I exploit the fact that I've 2 nearly identical boxes to track 
down the problem?

thanks

--
Ivan Sergio Borgonovo
http://www.webthatworks.it http://www.borgonovo.net