It appears your monitor is not telling the kernel what resolutions it supports. This might be a bug in the monitor's firmware, or it might just be a bad connection. Please try unplugging and replugging the monitor to the machine. Please also try a different VGA cable. Make sure it is plugged in securely.
[ 18.849593] nouveau 0000:01:00.0: VGA-1: EDID is invalid: [ 18.849595] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849595] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849596] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849596] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849597] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849598] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849598] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849599] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 18.849601] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for VGA-1 [ 18.928883] nouveau 0000:01:00.0: DRM: allocated 1024x768 fb: 0x60000, bo 00000000f9acc6e0 [ 18.963383] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for VGA-1 [ 18.963409] fbcon: nouveaufb (fb0) is primary device [ 18.963502] Console: switching to colour frame buffer device 128x48 [ 18.963519] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device [ 19.004009] [drm] Initialized nouveau 1.3.1 20120801 for 0000:01:00.0 on minor 0 [ 19.082043] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for VGA-1 ** Summary changed: - low resolution on my screen + low resolution on my screen [nouveau] ** Package changed: xorg (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Invalid ** Tags added: nouveau -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1791398 Title: low resolution on my screen [nouveau] Status in linux package in Ubuntu: Invalid Bug description: my normal monitor's resolution is 1920x1080, but when ubuntu is loading, it makes resolution 1024x768 and I can't make it better ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xserver-xorg 1:7.7+19ubuntu7.1 ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18 Uname: Linux 4.15.0-33-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 BootLog: Error: [Errno 13] Отказано в доступе: '/var/log/boot.log' CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Sat Sep 8 08:24:11 2018 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu GraphicsCard: NVIDIA Corporation GK106 [GeForce GTX 650 Ti] [10de:11c6] (rev a1) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. GK106 [GeForce GTX 650 Ti] [1043:842a] InstallationDate: Installed on 2018-09-03 (4 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: Gigabyte Technology Co., Ltd. GA-970A-DS3 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=ru_RU.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic root=UUID=dce9a9f1-258a-4c35-bf6b-35e197371bf4 ro quiet splash vt.handoff=1 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/14/2012 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F4 dmi.board.name: GA-970A-DS3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd08/14/2012:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-DS3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-DS3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-970A-DS3 dmi.sys.vendor: Gigabyte Technology Co., Ltd. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.91-2 version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1 version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1791398/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp