Comment # 44 on bug 1011158 from Hubert Mantel

As I wanted to clean things up I re-installed the machine and hoped it now
would work out of the box. But it seems meanwhile some new issue has been
introduced.

vainfo now again prints:

vdr:~ # vainfo 
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns -1
libva error: va_getDriverName() failed with unknown libva
error,driver_name=(null)
vaInitialize failed with error code -1 (unknown libva error),exit

It seems for some reason loading of the firmware now fails according to the
kernel logs:

[    2.954989] [drm] Memory usable by graphics device = 4096M
[    2.955096] [drm:finish_csr_load [i915]] *ERROR* Unknown stepping info,
firmware loading failed
[    2.956951] checking generic (80000000 8d0000) vs hw (80000000 10000000)
[    2.956954] fb: switching to inteldrmfb from VESA VGA