[Bug 111482] Sapphire Pulse RX 5700 XT power consumption

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Comment # 16 on bug 111482 from
One possibility could be to create a custom modeline, perhaps trying refresh
rates between 30-60hz (starting with 45hz), so you can find a point where the
high idle power usage kicks in. Reduced blanking modes could be useful if it's
a case of bandwidth.

See: https://github.com/kevinlekiller/cvt_modeline_calculator_12

Something like this, using just xrandr (-b option indicating reduced blanking
v2 mode):

./cvt12 5120 1440 45 -b

Which yields:
Modeline "5120x1440_45.00_rb2"  344.21  5120 5128 5160 5200  1440 1457 1465
1471 +hsync -vsync

Then:
xrandr --output DisplayPort-2 --newmode "5120x1440_45.00_rb2" 344.21  5120 5128
5160 5200  1440 1457 1465 1471 +hsync -vsync

xrandr --output DisplayPort-2 --addmode DisplayPort-2 "5120x1440_45.00_rb2"

xrandr --output DisplayPort-2 --mode "5120x1440_45.00_rb2"


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