Earlier I wrote:
> Here's the rub: I cannot run Gnome 3 on the desktop machine, but I can
> run it on the laptop machine.
>
> When I log in on the desktop machine, even with Gnome 3 chosen
> explicitly at the login prompt, it logs me into Gnome Classic anyway.
I fixed that problem by doing this:
$ sudo apt-get install firmware-linux-nonfree
Then I restarted the machine. (I probably could've done a modprobe, but
restart is fine.). Then I could successfully log in with Gnome 3.
Problem solved.
Here's how I found the answer. First I looked at dmesg:
$ dmesg
I saw this:
*ERROR* radeon kernel modesetting for R600 or later requires
firmware-linux-nonfree
That was certainly all the clue I needed to do the apt-get install.
However, digging further, I searched for that exact error message in
duckduckgo and found this:
https://wiki.debian.org/InstallingDebianOn/HP/Pavilion%20DV6-1260SG/Wheezy
That page confirmed what I suspected. I have a Radeon HD 4200 card, and
installing firmware-linux-nonfree solved the problem.
I am happily running Gnome 3 as we speak.
-- Patrick
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