How to fix issue with missing screen resolutions (AMD GPUs)
I've just had an issue with Fossapup64 not allowing me to set the correct screen resolution for my Philips QHD monitor. It's native resolution is 2560x1440 but I was only getting 1920x1080. Never had this issue with Xenialpup or Bionicpup. Anyway, here's how to fix the problem if you have it.
Open a terminal and type the following, substitute in the resolution you are looking for if it's not 2560x1440:
cvt 2560 1440
You will get back the modeline information that will need for the next step, something like below:
- cvt_scrnsht.png (93.27 KiB) Viewed 1530 times
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Now, open the Screen/Graphics Wizard from the setup menu, click on the advanced tab and choose to edit xorg.conf manually.
Xorg.conf will open in a text editor. Edit the "Monitor" and "Screen" sections so they appear as below (obviously use the modeline info you got from cvt earlier if it's different from mine).
- xorgcfg_scrnsht.png (97.5 KiB) Viewed 1530 times
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Restart X to make the changes take effect. Don't forget to save your session before you reboot! 