[Bug 71448] [UVD] qvdpautest is very slow on radeonsi (HD 7950)

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https://bugs.freedesktop.org/show_bug.cgi?id=71448

--- Comment #8 from darkbasic <darkbasic@linuxsystems.it> ---
I applied 'glx: Add support for the new DRI loader entrypoint' to
xorg-server-1.14.4 and I updated the rest of the graphic stack to latest
snapshot from git master: nothing changes.

While the test was running I got a "Bus error":

Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 14: reading
configurations from ~/.fonts.conf is deprecated.
qvdpautest 0.5.2
Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
Unknown GPU

VDPAU API version : 1
VDPAU implementation : G3DVL VDPAU Driver Shared Library version 1.0

FATAL: get_bits failed : No backend implementation could be loaded.!!

MPEG DECODING (1920x1080): 8 frames/s
MPEG DECODING (1280x720): 5 frames/s                                            
Errore di bus


Also I noticed that despite I did "echo high >
/sys/devices/pci0000:00/0000:00:1c.6/0000:03:00.0/power_dpm_force_performance_level"
I still get lots of power states switching in dmesg.

Please see attached dmesg.

I also noticed lots of "HDMI: ELD buf size is 0, force 128" and "HDMI: invalid
ELD data byte 0" in my dmesg. Maybe something audio related? Monitor is
attached using DVI, not HDMI.

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