Resolution limits are almost always imposed by the motherboard/system manufacturer. Not the software or CPU/GPU manufacturer. In the case of your system there are some interesting notes:
--- "*This DisplayPort only supports DP to D-Sub dongles. DP to HDMI dongles and DP to DVI dongles are not supported. To power up three monitors, please connect your monitors to 2 x HDMI and 1 x DP ports or 2 x HDMI and 1 x D-Sub ports via a DP to D-Sub dongle. HDMI 1 (4K/2K@30Hz) / HDMI 2 (4K/2K@30Hz) Supports DisplayPort 1.1a with max. resolution up to 4K x 2K (4096x2304) @ 30Hz" --- [https://www.asrock.com/nettop/Intel/Beebox%20Series/index.asp#Specification] So it appears the machine has some hardware limits that are relevant here: "DP to HDMI dongles and DP to DVI dongles are not supported." so make sure you're not using converters or converter cables. "HDMI 1 (4K/2K@30Hz) / HDMI 2 (4K/2K@30Hz)" so 2560x1440x60Hz is not supported over HDMI. 1920x1080x60Hz is the highest resolution those HDMI ports can do at full frame rate (presumably 60Hz). Although if you're OK with stuttering then you might be able to select 2560x1440x30Hz. "Supports DisplayPort 1.1a with max. resolution up to 4K x 2K (4096x2304) @ 30Hz" Sounds like it should support 2560x1440x60Hz but only if you're using a cable that is DisplayPort at both ends, because "DP to HDMI dongles and DP to DVI dongles are not supported". This is a problem I'm familiar with... A lot of low-power (but modern CPU) systems are made with graphics connectors that don't allow you to use the full resolution the GPU is capable of. Your best bet sounds like trying more cables that are DisplayPort at both ends. See also: https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video https://en.wikipedia.org/wiki/DisplayPort#Resolution_and_refresh_frequency_limits_for_DisplayPort -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1767993 Title: Lubuntu: X11 freezing/low resolution on N3150 intel graphics To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1767993/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
