I installed Manjaro a few months ago and immediately ran into some minor problems with the video driver.
Im using a Macbook Pro 7,1 (mid 2010)
They were just minor screen tears and stuff at first so I just kinda went with it for a while.
Recently I’ve started feeling more comfortable with the distro and decided I would give it a shot. I decided I would try and download the infamous NVIDIA drivers.
I tried using mhwd at first but it was unable to install the drivers for some reason. This was a while ago. I don’t remember all the details but I think it had something to do with mhwd not being able to detect my video card very well… I’m willing to trouble shoot this some more if needed.
SO. I followed this guide to download and install the drivers manually.
And got the blackscreen. 
Last night I came across this very helpful guide. And was able to install the drivers succesfully and get past the black screen.
Now however I have a new problem. Similar to the one mentioned here.
My resolution has changed and I cant seem to fix it. Using nvidia-settings hasnt seemed to work. Using nvidia-settings to adjust my resolution from 1280x800 to anything else causes the display size to change leaving me with some over/underscan problems. (the Display not fitting the screen)
I’m having trouble figuring out how to fix this. Any help would be appreciated.
XRANDR:
xrandr
Screen 0: minimum 8 x 8, current 1280 x 800, maximum 8192 x 8192
LVDS-0 connected primary 1280x800+0+0 (normal left inverted right x axis y axis) 286mm x 179mm
1280x800 60.22*+
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
INXI
System:
Kernel: 4.14.240-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
parameters: BOOT_IMAGE=/boot/vmlinuz-4.14-x86_64
root=UUID=4d31f39d-0ea5-444d-aa4f-09216b0d1adb rw nouveau.modeset=0 quiet
apparmor=1 security=apparmor
resume=UUID=3da65a5c-70d7-47d7-8e97-50a0c2f897f6 udev.log_priority=3
Desktop: KDE Plasma 5.22.3 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM
Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Laptop System: Apple product: MacBook7,1 v: 1.0 serial: <filter>
Chassis: type: 10 v: Mac-F22C89C8 serial: <filter>
Mobo: Apple model: Mac-F22C89C8 serial: <filter> UEFI: Apple v: 68.0.0.0.0
date: 06/14/2019
Battery:
ID-1: BAT0 charge: 39.9 Wh (78.9%) condition: 50.6/56.2 Wh (90.2%)
volts: 11.6 min: 10.8 model: SMP A1331 type: Li-ion serial: N/A
status: Discharging cycles: 57
CPU:
Info: Dual Core model: Intel Core2 Duo P8600 bits: 64 type: MCP arch: Penryn
family: 6 model-id: 17 (23) stepping: A (10) microcode: A0B cache: L2: 3 MiB
flags: lm nx pae sse sse2 sse3 sse4_1 ssse3 vmx bogomips: 9560
Speed: 796 MHz min/max: 798/2394 MHz Core speeds (MHz): 1: 796 2: 796
Vulnerabilities: Type: itlb_multihit status: KVM: Split huge pages
Type: l1tf mitigation: PTE Inversion; VMX: EPT disabled
Type: mds
status: Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
Type: meltdown mitigation: PTI
Type: spec_store_bypass status: Vulnerable
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2
mitigation: Full generic retpoline, STIBP: disabled, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: NVIDIA MCP89 [GeForce 320M] vendor: Apple driver: nvidia
v: 340.108 alternate: nouveau bus-ID: 02:00.0 chip-ID: 10de:08a0
class-ID: 0300
Device-2: Apple Built-in iSight type: USB driver: uvcvideo bus-ID: 1-6:2
chip-ID: 05ac:8507 class-ID: 0e02 serial: <filter>
Display: x11 server: X.Org 1.20.11 compositor: kwin_x11 driver:
loaded: nvidia display-ID: :0 screens: 1
Screen-1: 0 s-res: 1280x800 s-dpi: 112 s-size: 290x181mm (11.4x7.1")
s-diag: 342mm (13.5")
Monitor-1: LVDS-0 res: 1280x800 hz: 60 dpi: 114 size: 286x179mm (11.3x7.0")
diag: 337mm (13.3")
OpenGL: renderer: GeForce 320M/integrated/SSE2 v: 3.3.0 NVIDIA 340.108
direct render: Yes
Audio:
Device-1: NVIDIA MCP89 High Definition Audio driver: snd_hda_intel v: kernel
bus-ID: 00:08.0 chip-ID: 10de:0d94 class-ID: 0403
Sound Server-1: ALSA v: k4.14.240-1-MANJARO running: yes
Sound Server-2: JACK v: 0.125.0 running: no
Sound Server-3: PulseAudio v: 14.2 running: yes
Sound Server-4: PipeWire v: 0.3.32 running: no
Network:
Device-1: NVIDIA MCP89 Ethernet vendor: Apple driver: forcedeth v: kernel
port: 22a0 bus-ID: 00:09.0 chip-ID: 10de:0d7d class-ID: 0200
IF: enp0s9 state: down mac: <filter>
Device-2: Broadcom BCM43224 802.11a/b/g/n vendor: Apple AirPort Extreme
driver: wl v: kernel modules: bcma port: 2280 bus-ID: 01:00.0
chip-ID: 14e4:4353 class-ID: 0280
IF: wlp1s0 state: up mac: <filter>
IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A
Bluetooth:
Device-1: Apple Bluetooth Host Controller type: USB driver: btusb v: 0.8
bus-ID: 4-6.3:6 chip-ID: 05ac:8218 class-ID: fe01
Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends
Drives:
Local Storage: total: 111.79 GiB used: 56.27 GiB (50.3%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/sda maj-min: 8:0 vendor: Kingston model: SA400S37120G
size: 111.79 GiB block-size: physical: 512 B logical: 512 B speed: 3.0 Gb/s
type: SSD serial: <filter> rev: B1H5 scheme: GPT
Partition:
ID-1: / raw-size: 107.78 GiB size: 105.53 GiB (97.91%)
used: 56.27 GiB (53.3%) fs: ext4 dev: /dev/sda2 maj-min: 8:2
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 344 KiB (0.1%) fs: vfat dev: /dev/sda1 maj-min: 8:1
Swap:
Kernel: swappiness: 10 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: partition size: 3.71 GiB used: 0 KiB (0.0%) priority: -2
dev: /dev/sda3 maj-min: 8:3
Sensors:
System Temperatures: cpu: 55.0 C mobo: N/A gpu: nvidia temp: 59 C
Fan Speeds (RPM): N/A
Info:
Processes: 149 Uptime: 1h 5m wakeups: 3 Memory: 7.54 GiB
used: 2.45 GiB (32.4%) Init: systemd v: 248 tool: systemctl Compilers:
gcc: 11.1.0 clang: 12.0.1 Packages: pacman: 1444 lib: 370 flatpak: 0
Shell: Bash v: 5.1.8 running-in: konsole inxi: 3.3.06