Help please? problems with screen resolution & external monitor

had a look around this forum and seen many questions about screen resolution when connecting to an external monitor but unfortunately, non that help me answer my problem.
got a brand new macbook a few months ago and today bought a HP v220 22" external monitor.
I am new to the idea of external monitors and am unsure what i am doing wrong settings-wise. it seems that no matter what resolution i set either my macbook display, or the external monitor display to. the external monitor is still not sharp.
Im not sure how to explain what i need but basically i need it to be so that things appear on the external the same size as they do on my macbook screen, so that i will have more space to work in on my external monitor (i am a graphics student) but at the moment what appears on the monitor is lieterally just a magnified version of my macbook screen, hence it lacks clarity.
the highest resolution offered in the menu for my macbook screen is 1280x800 and my external is recommended to be set at 1680x1050.
what settings should i have to get the resolution right?
i will be so so grateful if you can help. i think ive tried every single display setting but to no avail. so please help me!

The 13.3" screen on the MacBook running at 1280 x 800 will have a ppi (pixels per inch) of around 113. A 22" monitor running 1680 x 1050 will have a ppi of around 90. So it is natural that it will look magnified compared with the MacBook. The two displays have different a pixel pitch.
Since there are no monitors with ~113 ppi out there in the market, what you want to do with having the same size and sharpness between the MB and a monitor will not be possible.
If you ran the MB's screen at 1024 x 640 (not even sure if that is an available choice), then the two screens would match in terms of "magnification." But the MB isn't going to look very sharp running such a low, non-native format.

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My laptop:
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Thank you for your answer.
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there are plenty of instances where the official driver have glitches... just look around the forum to find instances of which.... while official drivers maybe better in most instances, there are always the odd case where it doesn't work as well as it should. If they perfectly out of box, then there would never need to be multiple revisions and updates.
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Hallo to all the people out here!!!
I'm quite new to linux. I've been using Ubuntu and Mint for sometime but I decided to switch to Arch, since I decided to have more control over my machines. Before I go on I must clear out that most of those machines are build from old spare items.
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There's a strange sound like flick of a switch every time the resolution changes
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These outputs I think that will be useful :
uname -a
Linux archbox 3.3.2-1-ARCH #1 SMP PREEMPT Sat Apr 14 10:08:43 UTC 2012 i686 Intel(R) Celeron(R) CPU 2.80GHz GenuineIntel GNU/Linux
lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1) (prog-if 00 [VGA controller])
lsmod
Module Size Used by
fuse 59348 2
firewire_ohci 27283 0
firewire_core 44257 1 firewire_ohci
8139too 17280 0
8139cp 16043 0
snd_intel8x0 22672 0
ppdev 4750 0
crc_itu_t 1095 1 firewire_core
mii 3439 2 8139cp,8139too
snd_ac97_codec 89900 1 snd_intel8x0
parport_pc 26601 0
iTCO_wdt 10773 0
ac97_bus 874 1 snd_ac97_codec
shpchp 22557 0
iTCO_vendor_support 1545 1 iTCO_wdt
snd_pcm 60499 2 snd_ac97_codec,snd_intel8x0
snd_page_alloc 5901 2 snd_pcm,snd_intel8x0
snd_timer 15158 1 snd_pcm
snd 45013 4 snd_timer,snd_pcm,snd_ac97_codec,snd_intel8x0
floppy 49063 0
thermal 6563 0
fan 1902 0
soundcore 4986 1 snd
pcspkr 1423 0
i2c_i801 6992 0
parport 26479 2 parport_pc,ppdev
intel_agp 8688 1
processor 23476 0
pci_hotplug 21878 1 shpchp
intel_gtt 11193 1 intel_agp
evdev 7310 5
ext4 385004 3
crc16 1091 1 ext4
jbd2 60590 1 ext4
mbcache 4345 1 ext4
usbhid 31477 0
hid 66633 1 usbhid
sr_mod 13148 0
cdrom 30504 1 sr_mod
sd_mod 25867 5
pata_acpi 2388 0
ata_generic 2391 0
ata_piix 18616 4
libata 145775 3 ata_piix,ata_generic,pata_acpi
scsi_mod 112765 3 libata,sd_mod,sr_mod
uhci_hcd 19712 0
ehci_hcd 38480 0
usbcore 122719 4 ehci_hcd,uhci_hcd,usbhid
usb_common 622 1 usbcore
nouveau 700360 2
button 3614 1 nouveau
video 9819 1 nouveau
mxm_wmi 1101 1 nouveau
wmi 7259 2 mxm_wmi,nouveau
drm_kms_helper 23303 1 nouveau
ttm 46603 1 nouveau
drm 166804 4 ttm,drm_kms_helper,nouveau
agpgart 22159 4 drm,ttm,intel_gtt,intel_agp
i2c_core 16845 4 drm,drm_kms_helper,nouveau,i2c_i801
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Section "Monitor"
Identifier "Monitor0"
# Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025 1028 1060 -HSync +Vsync
# Option "PreferredMode" "1280x1024_60.00"
EndSection
Section "Device"
Identifier "Nvidia card"
Driver "nouveau"
EndSection
Section "Screen"
Identifier "Screen0" #Collapse Monitor and Device section to Screen section
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24 #Choose the depth (16||24)
SubSection "Display"
Depth 24
Modes "1280x1024_60.00" "1024x768" "640x480" #Choose the resolution
EndSubSection
EndSection
xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
VGA-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*
800x600 60.3 56.2
848x480 60.0
640x480 59.9
DVI-I-1 disconnected (normal left inverted right x axis y axis)
TV-1 disconnected (normal left inverted right x axis y axis)

OK I just renamed my configuration file from 20-mntrstp.conf to 20-nouveau.conf
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# Config file for GRUB - The GNU GRand Unified Bootloader
# /boot/grub/menu.lst
# DEVICE NAME CONVERSIONS
# Linux Grub
# /dev/fd0 (fd0)
# /dev/sda (hd0)
# /dev/sdb2 (hd1,1)
# /dev/sda3 (hd0,2)
# FRAMEBUFFER RESOLUTION SETTINGS
# +-------------------------------------------------+
# | 640x480 800x600 1024x768 1280x1024
# ----+--------------------------------------------
# 256 | 0x301=769 0x303=771 0x305=773 0x307=775
# 32K | 0x310=784 0x313=787 0x316=790 0x319=793
# 64K | 0x311=785 0x314=788 0x317=791 0x31A=794
# 16M | 0x312=786 0x315=789 0x318=792 0x31B=795
# +-------------------------------------------------+
# for more details and different resolutions see
# https://wiki.archlinux.org/index.php/GRUB#Framebuffer_resolution
# general configuration:
timeout 5
default 0
color light-blue/black light-cyan/blue
# boot sections follow
# each is implicitly numbered from 0 in the order of appearance below
# TIP: If you want a 1024x768 framebuffer, add "vga=773" to your kernel line.
# (0) Arch Linux
title Arch Linux
root (hd0,0)
kernel /vmlinuz-linux root=/dev/disk/by-uuid/4950a9db-cefe-4b24-a523-fbb375d5b6e3 ro
initrd /initramfs-linux.img
# (1) Arch Linux
title Arch Linux Fallback
root (hd0,0)
kernel /vmlinuz-linux root=/dev/disk/by-uuid/4950a9db-cefe-4b24-a523-fbb375d5b6e3 ro
initrd /initramfs-linux-fallback.img
# (2) Windows
#title Windows
#rootnoverify (hd0,0)
#makeactive
#chainloader +1
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Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
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Help please? problems with screen resolution & external monitor

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