libdrm: keep modeprint and proptest too

[sky42src]

This will add around 12KB (i did try gzip -9) to the image.
The proptest is need to activate a Intel GPU 10 bin workaround.

[jernejsk]

Aren't modeprint and proptest just subset of modetest?

[sky42src]

@jernejsk i have no idea. I learned from smp that i need proptest for the 10 bit max setting.

[jernejsk]

there is -w argument to modetest to write property

[sky42src]

What would be the replacement for proptest 185 connector 191 10?
modetest -w 185:191:10 does not do the trick

[jernejsk]

Last part must be property name, not a property number.

[sky42src]

How do i find the property name? I have absolutely no clue in how to use libdrm.
Found a replacement for finding the connector number with modetest -c | grep -E "[[:space:]]HDMI-A-1[[:space:]]" | awk '{ print $1 }' now i only need the right command to set the 10 bit.

[sky42src]

modetest -w 185:"max bpc":10 does not complain. I will check.

[sky42src]

Short test reveals i can make #8588 work with modetest that is already part of LE.

[sky42src]

Thank you @jernejsk