Arch Linux

xhpohanka

Member

Registered: 2014-10-21

Posts: 21

External monitor blurry on Thinkpad T14 gen5 amd

Hi,

I have a strange issue with blurry external monitor connected via HDMI. It is a venerable HP LP2475w. Whole image is somehow distorted. It should not be a hw issue, it works well with my older laptop with same Arch version.
I have tried to swap cable with no success. But other monitor I tried at my workplace works correctly.

HDMI-A-0 connected primary 1920x1200+1920+0 (normal left inverted right x axis y axis) 546mm x 352mm
	_MUTTER_PRESENTATION_OUTPUT: 0 
	EDID: 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 0 
		range: (0, 1)
	Colorspace: Default 
		supported: Default, BT709_YCC, opRGB, BT2020_RGB, BT2020_YCC
	content type: No Data 
		supported: No Data, Graphics, Photo, Cinema, Game
	max bpc: 16 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 101 
		supported: 101
	non-desktop: 0 
		range: (0, 1)
   1920x1200     59.95*+
   1920x1080     60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1600x1000     60.01  
   1280x1024     75.02  
   1440x900      59.95  
   1280x960      60.00  
   1280x800      59.95  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08

Any suggestions please?

br
Jan

Last edited by xhpohanka (2025-05-07 13:09:32)

xhpohanka

Member

Registered: 2014-10-21

Posts: 21

Re: External monitor blurry on Thinkpad T14 gen5 amd

Hmm, it is even more strange, I have noticed that the distortion depends on the data actually displayed. The worse situation is with fonts, on the other hand pictures and photographs seems to be displayed correctly...