Downgrade libdrm

[xmaster22]

Hello,
I am getting this error when trying to run optirun:

[ 4742.077356] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) /dev/dri/card1: failed to set DRM interface version 1.4: Permission denied
[ 4742.077380] [ERROR]Aborting because fallback start is disabled.

I found solution that might help:
You might also try downgrading libdrm from 2.4.58 to 2.4.56. That might fix the Permission denied errors in Jessie.

But, I do not know how to downgrade libdrm. Could you please help me how to downgrade it ?
Thanks