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[ubuntu] My screen (Samsung SyncMaster 923nw) is not properly recognized in Ubuntu

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http://ubuntuforums.org – I've searched the forum, but couldn't find the answer, so here's my question. I installed Ubuntu 9.04 on my PC. I installed the drivers for my graphics card, an Nvidia Geforce2 MX 100/200, but there's a problem. My screen, Samsung SyncMaster 923nw, is not properly recognized by Ubuntu and will only work in 640x480 with or without the Nvidia driver. In Windows XP, I always used 1280x960 without any problems, and i want that same resolution in Ubuntu. Does anyone know a solution for this problem? Thanks in advance! My PC: - Processor: Intel Pentium 4 2.8GHZ - Memory: 1 GB - Graphics: Nvidia Geforce2 MX 100/200 - Screen: Samsung SyncMaster 923nw lspci output: Quote: 00:00.0 Host bridge: Intel Corporation 82865G/PE/P DRAM Controller/Host-Hub Interface (rev 02) 00:01.0 PCI bridge: Intel Corporation 82865G/PE/P PCI to AGP Controller (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #3 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2) 00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE Controller (rev 02) 00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02) 00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation NV11DDR [GeForce2 MX200] (rev b2) 05:02.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5782 Gigabit Ethernet (rev 03) (Hardware)