I have a strange issue concerning the recognition of my monitor. It’s a WQHD monitor from Dell (S2716DG) and it worked beautifully before, using HDMI, now, all of a sudden, it just allows 1024x768 resolution (or 800x600 from the good old days).
The issue manifested itself like this (long story):
Work laptop: It runs Windows 10. It worked well with the monitor, too, except for some hickups. When I let the monitor go into energy saver, sometimes it showed only 1024x768 too, but when I unplugged the HDMI, waited a bit, and plugged it in again, it was back to WQHD. Until a few days ago. Then it had this issue again, but I logged in first, before unplugging and since then my work laptop (a Dell too) only can set 1024x768 as the recommended (and highest) resolution on this monitor. So this Windows doesn’t recognize the monitor anymore correctly.
Private machine, Linux: I hoped the fresh machine would somehow reset the correct value again and I plugged the HDMI into my Manjaro machine, but here I am writing in a Manjaro forum, because it since then has the same issue. The max resolution that works is 1024x768. The highest that is offered at all is 1600x900, but that doesn’t work. xrandr (one of the tools that kept showing up in my internet searches) shows this:
➜ ~ xrandr --query Screen 0: minimum 8 x 8, current 1024 x 768, maximum 16384 x 16384 VGA-0 disconnected (normal left inverted right x axis y axis) DVI-D-0 disconnected (normal left inverted right x axis y axis) HDMI-0 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 60.00*+ 1600x900 59.82 1400x900 59.88 1368x768 59.88 59.85 1280x800 59.91 59.81 1280x720 59.86 59.74 1024x576 59.90 59.82 960x540 59.82 59.63 864x486 59.92 59.57 800x600 72.19 60.32 56.25 800x450 59.82 700x450 59.88 684x384 59.88 59.85 640x480 59.94 640x400 59.98 59.88 640x360 59.86 59.83 512x384 60.00 512x288 60.00 59.92 480x270 59.82 59.63 432x243 59.92 59.57 400x300 72.19 320x240 60.05
I became desperate and tried (sure why not) the Windows 10 installation on the very same computer with Manjaro.
- Private Machine, Windows 10: Everything works as it should. Full WQHD resolution is available. No issues whatsoever.
I’m stumped. I don’t even know where I should start here.
I know that
- the HDMI cable is intact (something that one reads when it comes to issues with monitors, too), because Win 10 has in 1 of 2 installations no issues.
- the monitor itself works
The issue occurs using 2 machines, but only on 2 of the 3 OS’s installed and unnervingly on 2 different ones.
I guess my question would be: How do I force Manjaro to get the information from the monitor’s plug&play functionality again and not rely what is stored? Somehow they talked and Linux (nor Windows) recheck that they actually are plugged to a 1024x768 device.