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I need to set higher resolution on my Zotac XBOX. This is list of resolutions which I see in the dropdown box:

enter image description here

I need to select this 1680x1080 resolution. Currently if I select it, it doesn't work and goes back to currently selected 1280x800. This resolution is supported by Windows on same PC and also I've clearly seen it working during first logins to Ubuntu after installation. But somehow later it has downgraded to 1280x800. This is output of my xrandr:

enter image description here

I've added this last line from cvt, but as I said earlier, it doesn't work:

enter image description here

It seems that I need to change something in video driver, but there is no Linux drivers on ZOTAC website. Also there is no driver here:

enter image description here

What else can I try to do? I clearly remember that this resolution worked successfully on this Ubuntu 18 with this hardware.

UPDATE: setting different crtc also fails:

enter image description here

May be problem is video card driver, this is how windows uses this device according to GPUZ:

enter image description here

UPDATE2: interesting observation: initial system login dialog somtimes has good resolution. And also if I install xorg intel driver, then I get good resolution, but mouse and keyboard are dead.

UPDATE3: I've found out that if I disconnect PC from 220V, turn off monitor, then start everything again, then resolution is good. If during my work screensaver starts or cable gets reconnected, then it goes to this 1280x800 mode and there is no way back except this hard restart. (This device has alike problems on Windows, but it is not about limited set of modes there, but monitor sometimes can't resurrect at all after cable reconnect). Also as requested, here is output of dpkg -l bolt:

enter image description here

UPDATE4 As I have noticed, screen saver can cause resolution degradation, so I had to turn it off in this fancy way:

enter image description here

  • Did you by any chance set a modeline with cvt? – Elder Geek Aug 22 '19 at 21:31
  • yes, it was set using cvt – stiv Aug 22 '19 at 21:40
  • Did you nby any chance follow every step here? askubuntu.com/a/377944/225694 – Elder Geek Aug 23 '19 at 12:05
  • this is exactly what I did, I created this extra mode, but it doesn't work – stiv Aug 23 '19 at 18:32
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    The output of dpkg -l bolt might also be useful to edit into your question as according to your specs your system supports display port via a Thunderbolt 3 to Display port adapter. – Elder Geek Aug 24 '19 at 22:21
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Thanks to the @ElderGeek, I've found a workaround, I've bought cable like this to connect monitor via thunderbold:

enter image description here

it works perfectly without any extra setup.

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