1) I used to have radeon.dpm=1 to save power (although, I don't have
numbers how much better it is with respect to no parameter).

2) I can't. 
My Ubuntu 17.10 (and according to my knowledge it's a trend in the community) 
runs with Wayland, not Xorg so there is not Xorg server with its log file. 
Thus, as suggested on the webpage 
(, I use 
journalctl to combine all relevant log information. Thus, you do have entire 
logs, only with different file names. 

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Incomplete => Confirmed

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  1002:6821 Graphical issues when radeon MST enabled

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