Bug#965105: Found a solution.

[Roberto Resoli]

On Thu, 16 Jul 2020 20:24:16 +0200 Roberto Resoli <robe...@resolutions.it> 
wrote:
> After some digging in the code, I found the problem. 
> So ioctl MTGETCPOS is never called, and an lseek is issued instead.

Sorry, I meant MTIOCPOS.

rob