Bug#783381: upgrade from wheezy to jessie on a PowerMac G4 Silver/Confirmation
Try adding
append=“ nomodeset"
to the end of the main stanza in /etc/yaboot.conf. Then (as root) execute “ybin” to propagate the change to the bootstrap routines.
This will set the kernel command line to inhibit the kernel from trying to use hardware acceleration for your video.
The result will be (hopefully) two-fold: (1) slower video (but not much slower as long as you’re not using 3D features) and (2) better control over the color and layout of your screen.
I’ve found it’s the only thing that works for my G5 PowerMac.
Hope it helps you too!
Rick
On Jun 8, 2015, at 1:56 PM, Alois Zoitl <aloiszoitl@gmail.com> wrote:
> Hi,
>
> thanks. Looks like there is no Gnome for non Intel platforms. With XFCE and lightdm I got graphics partly working. Still rad and blue is exchanged.
>
> But I don't want to hijack this bug for the graphics problems ;-)
>
> Regards,
> Alois
>
> On Sat, Jun 6, 2015 at 1:57 PM, Manfred Stock <manfred.stock+debian@gmail.com> wrote:
> Package: upgrade-reports, linux-image-3.16.0-4-powerpc
> Followup-For: Bug #783381
>
> Hi,
>
> > And now to the graphics problems :-(
>
> on my system, I could improve the situation by replacing GDM3 with Lightdm, and
> Gnome3 with the Awesome or Fluxbox window manager (since they actually started
> and displayed something, which was not the case with GDM or Gnome, they just
> displayed an error along the lines of "something went wrong", with a logout
> button). However, I then got some kind of crash/lockup when I executed eg.
> dmesg in an xterm (mouse pointer still visible/movable, but otherwise, nothing
> changed, and restarting X iirc just got me a black screen with mouse pointer).
> I could improve that by adding
> append="radeon.agpmode=-1"
> to the yaboot config of the kernel I'm booting, which disables AGP mode, but so
> far seems to result in a stable system (I have the feeling that it feels slower
> on certain UI updates though, but I'm not sure about his). So far, I've found
> some bug reports [1,2,3] which might be related to these issues, but haven't
> tried anything further.
>
> Still don't have working suspend to disk/ram though, but that could actually be
> related to the graphics issues and/or my workaround.
>
> Kind regards
> Manfred
>
> [1] https://bugs.debian.org/762047
> [2] https://bugs.debian.org/782066
> [3] https://bugs.debian.org/683796
>
>
> -- System Information:
> Debian Release: 8.0
> APT prefers stable-updates
> APT policy: (500, 'stable-updates'), (500, 'stable')
> Architecture: powerpc (ppc)
>
> Kernel: Linux 3.16.0-4-powerpc
> Locale: LANG=de_CH.utf8, LC_CTYPE=de_CH.utf8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/bash
> Init: systemd (via /run/systemd/system)
>
> --
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>
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