i.MX ProcessorsのトピックProgrammatically change HDMI resolution on i.MX.6Q https://community.nxp.com/t5/i-MX-Processors/Programmatically-change-HDMI-resolution-on-i-MX-6Q/m-p/225381#M15823 <HTML><HEAD></HEAD><BODY><P>Does anyone know how to change HDMI resolution by C/C++ program?</P><P>I'd like to achieve the same result as right click on the "Windows Desktop" and adjust the resolution.</P><P></P><P>Right now I can change HDMI resolution only by setting the u-boot environment variable (<SPAN lang="EN-US" style="font-family: Consolas; color: blue;">bootargs_base=setenv bootargs console=ttymxc0,115200 enable_wait_mode=off </SPAN><STRONG><SPAN lang="EN-US" style="font-family: Consolas; color: red;">video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24</SPAN></STRONG><SPAN lang="EN-US" style="font-family: Consolas; color: blue;"> dmfc=3</SPAN>), but I can't freely choose the resolution I want.</P><P></P><P>By using <SPAN style="color: #0000ff;">cat /sys/devices/platform/mxc_sdc_fb.0/graphics/fb0/modes<SPAN style="color: #000000;"> , it shows</SPAN></SPAN></P><P>V:640x480p-60</P><P>D:1920x1080p-60</P><P>U:640x480p-60</P><P></P><P>I guess the HDMI resolution can only be changed to 640x480/1920x1080, but what does the initial V/D/U means?</P><P></P><P>Another question is how to cut the HDMI output signal on demand to achieve something like screen(energy) saving?</P><P></P><P>Can someone help me out please, thanks a lot!!</P></BODY></HTML> Tue, 18 Jun 2013 03:34:23 GMT joepsycho 2013-06-18T03:34:23Z Programmatically change HDMI resolution on i.MX.6Q https://community.nxp.com/t5/i-MX-Processors/Programmatically-change-HDMI-resolution-on-i-MX-6Q/m-p/225381#M15823 <HTML><HEAD></HEAD><BODY><P>Does anyone know how to change HDMI resolution by C/C++ program?</P><P>I'd like to achieve the same result as right click on the "Windows Desktop" and adjust the resolution.</P><P></P><P>Right now I can change HDMI resolution only by setting the u-boot environment variable (<SPAN lang="EN-US" style="font-family: Consolas; color: blue;">bootargs_base=setenv bootargs console=ttymxc0,115200 enable_wait_mode=off </SPAN><STRONG><SPAN lang="EN-US" style="font-family: Consolas; color: red;">video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24</SPAN></STRONG><SPAN lang="EN-US" style="font-family: Consolas; color: blue;"> dmfc=3</SPAN>), but I can't freely choose the resolution I want.</P><P></P><P>By using <SPAN style="color: #0000ff;">cat /sys/devices/platform/mxc_sdc_fb.0/graphics/fb0/modes<SPAN style="color: #000000;"> , it shows</SPAN></SPAN></P><P>V:640x480p-60</P><P>D:1920x1080p-60</P><P>U:640x480p-60</P><P></P><P>I guess the HDMI resolution can only be changed to 640x480/1920x1080, but what does the initial V/D/U means?</P><P></P><P>Another question is how to cut the HDMI output signal on demand to achieve something like screen(energy) saving?</P><P></P><P>Can someone help me out please, thanks a lot!!</P></BODY></HTML> Tue, 18 Jun 2013 03:34:23 GMT https://community.nxp.com/t5/i-MX-Processors/Programmatically-change-HDMI-resolution-on-i-MX-6Q/m-p/225381#M15823 joepsycho 2013-06-18T03:34:23Z Re: Programmatically change HDMI resolution on i.MX.6Q https://community.nxp.com/t5/i-MX-Processors/Programmatically-change-HDMI-resolution-on-i-MX-6Q/m-p/225382#M15824 <HTML><HEAD></HEAD><BODY><P>I don´t think the current kernel can handle resolution change on the fly. You should implement a way to achieve that.</P></BODY></HTML> Mon, 24 Jun 2013 16:53:20 GMT https://community.nxp.com/t5/i-MX-Processors/Programmatically-change-HDMI-resolution-on-i-MX-6Q/m-p/225382#M15824 daiane_angolini 2013-06-24T16:53:20Z