After a year and half, I've finally cracked suspend/resume in Linux on the HP Pavilion g6-2210us laptop (AMD A4-4300M APU with AMD Radeon HD 7420G graphics) with the open-source Radeon driver.

I've been able to successfully suspend/resume for some time on this laptop with the closed-source AMD Catalyst driver, but two things have prompted me to give that driver up for the open Radeon driver:

1) AMD Catalyst hasn't been packaged for Fedora since Fedora 19, and we're about to see Fedora 21 released with no indication that things will change. There are at least a couple of workarounds that will get Catalyst/fglrx on your Fedora 20 system, both of which I've written about at length, but I'm tired of doing them. While the Catalyst/fglrx experience is somewhat smoother on distributions that are serious about packaging the driver (Debian and Ubuntu come to mind), breakage is inevitable on fast-moving distros like Fedora that get new Linux kernels all the time.

2) While AMD Catalyst allows the laptop to run cooler at idle (I'm pretty sure it runs at a similar temperature under load), the quality of video -- actual videos in applications like VLC, that is -- is better with the latest Radeon driver than with Catalyst. Briefly, when I'm watching something and the image is "moving," it breaks up horizontally in Catalyst, not at all in Radeon.

But suspend/resume trumps all. Having it with Catalyst kept me ... running Catalyst.

Now that I've cracked the code for successful suspend/resume without Catalyst, the infrequently updated, not-packaged-for-Fedora, closed-source driver is fading in my virtual rear-view mirror.

So how do you get suspend/resume working on this particular HP Pavilion g6 (or similarly equipped) laptop?

There are two changes you need to make in GRUB.

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I've been doing test installs again, among them Debian Jessie, and things don't work as well as they should on my HP Pavilion g6-2210us laptop without a couple of firmware packages that can be installed after a little tweaking.

Before I go on, for my particular laptop with a Realtek wireless module, the two Debian packages I need to install are firmware-linux-nonfree and firmware-realtek.

If you use the "regular" Debian images to install, as I did this time, instead of the harder-to-find, unofficial ones with non-free firmware included, after installation you have to first get into your /etc/apt/sources.list file as root and add the contrib and non-free repositories, update your software sources with apt, and then install the firmware packages.

First, as root, modify your /etc/apt/sources.list, adding contrib non-free to every repo line.

Here are a few web sites that can help if you've never done this before.

Let me just say that if you hope to use Debian for any length of time, you WILL be mucking with /etc/apt/sources.list, so you might as well learn it now.

Once you have contrib and non-free added to your lines in /etc/apt/sources.list, use either su or sudo to update your software sources with apt. Since sudo isn't in the Debian default (though I always install and configure it immediately with visudo), I will give the "recipe" below as if you are using su with the root pasword to get full privileges:

$ su

(enter the root password when prompted)

# apt-get update
# apt-get install firmware-linux-nonfree firmware-realtek

Then reboot the box, and you are good to go.