<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> Hi, I'm trying to fix an overscan issue (the image overflows by all 4 sides) with my screen when connected through HDMI. It works fine over DVI. My Intel graphics card doesn't seem to support the 'overscan' xrandr property, so I'm trying to fix it with '--transform'. The thing is most of the times it fails. For example, if I directly run this command, it always fails: $ xrandr –output HDMI-1 –transform 1,0,-46,0,1,-26,0,0,1 X Error of failed request: (invalid parameter attributes) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 21(RRSetCrtcConfig) Serial number of failed request: 34 Current serial number in output stream: 34 However, If I run first: xrandr –output HDMI-1 –transform 1,0,-46,0,1,-26,0,0,1 then: xrandr –output HDMI-1 –transform 1,0,-46,0,1,-26,0,0,1 it works. Nevertheless, while trying different values, it usually fails with exactly the same error as the first command. What's the reason of this error? Is something hardware/software-related or am I doing something wrong? Apart from the errors, I'm having a hard time figuring out the proper transform matrix. For example, if make the image fit horizontally adjusting just the first term (x scale): xrandr --output HDMI-1 --transform 1.26,0,0,0,1,0,0,0,1 then try to fit it vertically: xrandr --output HDMI-1 --transform 1.26,0,0,0,1.15,0,0,0,1 the X axis gets messed up growing or shrinking, although I was supposed to just be modifying the other axis. Another thing I don't understand is how the scaling factors work. I'd say factors greater than 1 should expand the image while factors below 1 should shrink it. However, it seems to work the other way around. Although depending on the values it seems to do as expected. Moreover, values below 1 make the command always fail with the same BadMatch error as above. Have I misunderstood how it works? What procedure should I follow to find the right values? I've also tried with intel_panel_fitter with no luck: $ sudo intel_panel_fitter -l Pipe A: - disabled Pipe B: - enabled - progressive - pf disabled Pipe C: - disabled $ sudo intel_panel_fitter -p B -x 1900 -y 1000 WARNING: This tool is a workaround for people that don't have a Kernel with overscan compensation properties: it is just a temporary solution that may or may not work. Use it at your own risk. Changing size for pipe B: - width: 1920 -> 1900 - height: 1080 -> 1000 - pos: 10x40 Nothing happens. Neither does with the other pipes. Additional data: The overscan issue is independent of the computer (laptop/desktop) and the operating system (Ubuntu 21.10/Windows 11). Kernel: 5.13.0-22-generic x86_64 Graphics card: Iris Plus Graphics G7 (i915 module) Screen: ViewSonic VX2260WM. I haven't found any option on the OSD menu to fix it. I'm attaching Xorg's log, but I don't see any error when the xrand commands fail. Files with additional information attached too. Thanks, Àlex </body> </html>