I was now able to test 4.12.4-2 with my HIS r7 240.... I also tested the latest 4.12.5 and 4.9.41 kernels. Unfortunately, not any change . Debian 8 still stucks at the UTMP setup with "rtl8139 ... link up/down" message, and with Mate Remix 2017 I still get the same garbage screen as with previous kernel version.Spectre660 wrote: Can you try this updated kernel (4.12.4 version 2) with your r7 240 and Debian 8.
It has some radeon firmware that was not in previous kernels.
But I noticed that now also Ubuntu 16.04, after I updated it via net updater, behaves similarly to Mate Remix, giving just that garbage screen with r7 240! It was not a good idea to update it... How could I recognize the components in the update which caused this? I could then try if the older ones would work with Mate Remix, too.