[SOLVED] Laptop External Monitor - Low resolution

[roblm]

I see these stripes when I open any folder or program only on coloured items.

But the Displays program’s colors look normal without any stripes. Unfortunately, you don’t have another PC to connect the monitor to for testing.

Under Desktop Settings > Windows, change the setting for the Window Manager from Marco to Metacity. Then try Marco + Compton and other selections.

Under the Windows program, try marking the checkbox next to Enable software compositing window manager.

[seleoo]

The Displays program window was a screenshot and not photo taken by a mobile.

In the Desktop Settings / Windows, I had Marco + Compositing selected, I tried the other configurations with no luck.

In the Windows program , the Enable software compositing window manager was already checked.

I'll try to find another pc to test the monitor. As the primary target of the post was achieved, I should mark it as Solved. Thank you very much for your help!

[roblm]

Would you post screenshots of Firefox and Caja (file manager) windows.

[seleoo]

There you are

[roblm]

So it appears that everything is working correctly. I assumed you were getting the greenish background and stripes when opening certain programs, but it’s only when you take pictures using a cell phone. I can’t explain the physics as to why that happens but often when I have used a camera to take pictures of a monitor screen, the colors were not always exact. Even using the Screenshot app can produce the wrong colors, as seen in the picture below, which I used in another topic. The panel on the right shows the true colors.

screenshot color.png

Amazingly, using the vesa driver and a similar configuration as you are now using, I can get a 1920x1080 resolution on a monitor that has that native resolution and can play full-screen videos in VLC without any slowdown. My graphics card supports that VESA mode. There is higher CPU usage but not extreme, mostly in the range of 35 to 45%. With previous testing, I could not get a resolution higher than 1024x768 and mouse movements were frequently slow and jerky and there was significant slowdown when playing full-screen videos.

Can you play full-screen videos without any slowdown?

There is one other method you can test, which is to try to load the modesetting driver. It works for newer video cards but may not with your older one. This would give performance comparable to using the nouveau driver. You would have to remove the parameters from the grub file, update grub, disable the xorg.conf file, and re-install the fbdev driver: apt install xserver-xorg-video-fbdev.

Then remove the nouveau driver: apt remove xserver-xorg-video-nouveau
Reboot and hopefully the modesetting driver will be loading.

[seleoo]

I tried your last suggestion but I end up with 1024x768 resolution and vesa driver loaded.

Code: Select all

inxi -Gx
Graphics:  Card: NVIDIA G73M [GeForce Go 7600] bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: vesa (unloaded: fbdev)
           Resolution: 1024x768@61.00hz
           GLX Renderer: llvmpipe (LLVM 6.0, 128 bits)
           GLX Version: 3.0 Mesa 18.0.5 Direct Rendering: Yes

Code: Select all

xrandr --verbose
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 (0x26f) normal (normal) 0mm x 0mm
	Identifier: 0x26e
	Timestamp:  45027
	Subpixel:   unknown
	Clones:    
	CRTC:       0
	CRTCs:      0
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
  1024x768 (0x26f) 47.972MHz *current
        h: width  1024 start    0 end    0 total 1024 skew    0 clock  46.85KHz
        v: height  768 start    0 end    0 total  768           clock  61.00Hz
  800x600 (0x270) 29.280MHz
        h: width   800 start    0 end    0 total  800 skew    0 clock  36.60KHz
        v: height  600 start    0 end    0 total  600           clock  61.00Hz
  640x480 (0x271) 18.432MHz
        h: width   640 start    0 end    0 total  640 skew    0 clock  28.80KHz
        v: height  480 start    0 end    0 total  480           clock  60.00Hz

So I revert back to the previous working configuration. Thank you very much once again.