#Amd custom resolution not working drivers#
The open-source drivers do not support 21:9 resolution with the old cards (not sure if they work properly with new cards). This problem happens with "old" AMD cards (before GCN), like mine. Please only do this as a last resource, since it is risky. If anyone else is having this problem, here's what I found. I know the solution isn't optimal, and it's probably gonna bring me some headache in the future, but nothing else worked. I managed to get it to work by downgrading both X and the kernel version. Let me know if more info on my computer is needed. I even tried to get the driver from AMD's site, but it failed saying my XServer version was too new. In Debian 9, however, it seems fglrx is not available. It seemed to only work with fglrx (that only worked on Debian). I have had this problem since I bought this monitor, and because of it I actually changed OSs a bunch of times trying to get it to work. This worked when I was using Debian 8 (jessie). Even if I set my monitor to forcefully widen the image to 21:9 the image is still messed up. I've tried adding the resolution to xrandr (using both gtf and cvt), but it still shows a 16:9 resolution, with a really messed up image, like it was a 21:9 display scaled. The correct resolution won't show up as default in the display manager. I recently installed Debian 9 (stretch) and can't get the display to show in 2560x1080, just 1920x1080 (with black bars on both sides, or really stretched if I configure my monitor to widen it forcefully). I have a Radeon HD 6950 GPU and a LG 21:9 monitor (LED IPS 25 Full HD 25UM58-P.AWZ).