[Bug 60523] Radeon DPM not working with 2 monitors attached to Radeon HD5770 (Juniper)

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https://bugzilla.kernel.org/show_bug.cgi?id=60523

--- Comment #25 from Christian Birchinger <joker@xxxxxxxxxxxx> ---
So with the problem being the vblank i switched the resolutions using xrandr.
Using lower resolution modes makes it start switching.

~ $ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 416mm
x 312mm
   1600x1200      85.0*+
   1280x1024     100.0  
   1152x864       99.4  
   1024x768      100.0  
   800x600       100.0  
   640x480       100.0  
   640x400        85.1  
   400x300       144.4  
   320x240       150.3  
   320x200       139.9  

"1280x1024" and "640x400" makes it switch to level 0. But my default working
mode "1600x1200" for the past 10+ years triggers the issue.

Modeline        "1600x1200" 220.00 1600 1616 1808 2080 1200 1204 1207 1244
+hsync +vsync
Modeline        "1280x1024" 181.75 1280 1312 1440 1696 1024 1031 1046 1072
-hsync -vsync
Modeline        "1152x864"  137.65 1152 1184 1312 1536 864 866 885 902 -hsync
-vsync
Modeline        "1024x768"  115.50 1024 1056 1248 1440 768 771 781 802 -hsync
-vsync
Modeline        "800x600"    69.65 800 864 928 1088 600 604 610 640 -hsync
-vsync
Modeline        "640x480"    45.80 640 672 768 864 480 488 494 530 -hsync
-vsync
Modeline        "640x400"    31.50 640 672 736 832 400 401 404 445 -hsync
+vsync
Modeline        "400x300"    25.00 400 424 488 520 300 319 322 333 doublescan
Modeline        "320x240"    15.75 320 336 384 400 240 244 246 262 doublescan
Modeline        "320x200"    12.59 320 336 384 400 200 204 205 225 doublescan

I only really use the 1600x1200 now the old stuff comes from a time where
scaling used the whole CPU ;)

The EDID file it uses on bootup contains the same modes. EDID was generated
with the same values because
the radone driver seems to ignore the values in xorg.conf and only uses EDID
from KMS etc.

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