missing resolution on XPS13 after upgrading to 16.10

Question

I'm not sure if this is a bug, so i'm posting a question first so see if anyone can help me figure out it's a bug.

I just upgraded from 16.04 to 16.10 and now i'm missing a resolution mode on my XPS13-9350. I have 3200x1800 available, but i rather use 2560x1600, which was available to me while i was running 16.04.

I tried to mess a bit with xrandr, but the system froze while i was trying out stuff, so i'm not sure this is the right way.

Can anyone help me further?

Answer 1

So i took some time to read some more about xrandr here; https://wiki.ubuntu.com/X/Config/Resolution#Setting_resolution_changes_in_xorg.conf_--_resolution_lower_than_expected

I finally resolved it by using the same manual, my exact steps were;

XPS-13-9350:~$ xrandr -q Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mm 3200x1800 59.98 + 2048x1536 60.00
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
1920x1200 59.95
1920x1080 59.93* 1600x1200 60.00
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05

XPS-13-9350:~$ cvt 2560 1440 60

XPS-13-9350:~$ xrandr --newmode "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

XPS-13-9350:~$ xrandr --addmode eDP-1 2560x1440_60.00

After that i could select the mode from the settings --> display. As you see in the lines of command, my resolution turned out to be 2560x1440 (16:9) instead of the 2560x1600 (16:10), an error on my part.