Hardware assisted video decoding on Radeon KMS driver?

[Grzegorz Junka]

On 16/02/2018 22:25, tech-lists wrote:
>
> Hi,
>
> I have one of these as well. Didn't know if it was accelerated or not,
> used the radeonkms driver. It ran with 11-1 stable for a while, nice n
> sharp screen. What made me install linux mint was the fact that I
> couldn't dim the screen on freebsd. It was stuck at 100%. cpufreq
> couldn't work with the chip. These two things were a bit of a
> dealbreaker for me with this netbook.
>
> That was with 11-stable of a while ago now. I'll give 12-current and
> that new drm-next-kmod a spin.
>
> My previous dmesg on freebsd and linux are at
> https://www.zyxst.net/txt/amd-c70-netbook/
>

Do you have on your laptop function keys to dim the screen? These are 
usually located on number keys on the keyboard. In my case I can dim the 
screen when I am booting the system, through BIOS, up to the screen 
where I can select the FreeBSD kernel. Once the NVidia driver is loaded 
by the kernel these function keys stop working. So I simply learned to 
dim the screen while booting and then it stays dimmed once the system 
and X11 is loaded. If that works for you then it maybe a suitable 
workaround.

Regards
GrzegorzJ