topic Custom HDMI Resolution Configuration Issue on i.MX8M Plus in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/Custom-HDMI-Resolution-Configuration-Issue-on-i-MX8M-Plus/m-p/2351198#M244897 <P>We are configuring a <STRONG>MAX96751 serializer</STRONG> for a resolution of <STRONG>1600×480</STRONG>. We have generated a custom EDID and configured the serializer accordingly. When connected to a laptop/PC, the system correctly detects and supports the 1600×480 resolution.</P><P>However, on our <STRONG>i.MX8M Plus EVK</STRONG>, the HDMI output only defaults to <STRONG>800×600</STRONG>, and the custom resolution is not being applied.</P><P>We have already:</P><UL><LI>Generated and applied a custom EDID</LI><LI>Verified the resolution works on other systems (PC/laptop)</LI><LI>Attempted manual resolution configuration</LI></UL><P>Could you please confirm:</P><OL><LI>Whether the i.MX8M Plus HDMI interface supports custom resolutions and timings?</LI><LI>The correct procedure to configure a custom HDMI resolution (e.g., via EDID, device tree, or DRM settings)?</LI><LI>Any additional steps required to force the system to use the custom mode?<BR /><BR />My EDID<BR /><BR />root@imx8mp-lpddr4-evk:~# cat /sys/class/drm/card1-HDMI-A-1/edid | hexdump -C<BR />00000000 00 ff ff ff ff ff ff 00 04 89 01 00 00 00 00 00 |................|<BR />00000010 01 21 01 04 a5 46 27 78 3a 76 45 ae 51 33 ba 26 |.!...F'x:vE.Q3.&amp;|<BR />00000020 0d 50 54 01 00 00 01 01 01 01 01 01 01 01 01 01 |.PT.............|<BR />00000030 01 01 01 01 01 01 40 17 40 80 61 e0 14 10 58 90 |......@.@.a...X.|<BR />00000040 37 00 ba 89 21 00 00 1e 00 00 00 ff 00 47 4d 53 |7...!........GMS|<BR />00000050 4c 30 30 31 0a 20 20 20 20 20 00 00 00 fc 00 47 |L001. .....G|<BR />00000060 4d 53 4c 0a 20 20 20 20 20 20 20 20 00 00 00 fd |MSL. ....|<BR />00000070 00 18 4b 1e b4 6c 01 0a 20 20 20 20 20 20 00 d2 |..K..l.. ..|<BR />00000080<BR /><BR /><STRONG>Board :</STRONG> IMX8MP-Lpddr4<BR /><STRONG>Linux :</STRONG> 6.6<BR /><BR /></LI></OL> Wed, 15 Apr 2026 07:12:16 GMT SanthoshRajavel 2026-04-15T07:12:16Z Custom HDMI Resolution Configuration Issue on i.MX8M Plus https://community.nxp.com/t5/i-MX-Processors/Custom-HDMI-Resolution-Configuration-Issue-on-i-MX8M-Plus/m-p/2351198#M244897 <P>We are configuring a <STRONG>MAX96751 serializer</STRONG> for a resolution of <STRONG>1600×480</STRONG>. We have generated a custom EDID and configured the serializer accordingly. When connected to a laptop/PC, the system correctly detects and supports the 1600×480 resolution.</P><P>However, on our <STRONG>i.MX8M Plus EVK</STRONG>, the HDMI output only defaults to <STRONG>800×600</STRONG>, and the custom resolution is not being applied.</P><P>We have already:</P><UL><LI>Generated and applied a custom EDID</LI><LI>Verified the resolution works on other systems (PC/laptop)</LI><LI>Attempted manual resolution configuration</LI></UL><P>Could you please confirm:</P><OL><LI>Whether the i.MX8M Plus HDMI interface supports custom resolutions and timings?</LI><LI>The correct procedure to configure a custom HDMI resolution (e.g., via EDID, device tree, or DRM settings)?</LI><LI>Any additional steps required to force the system to use the custom mode?<BR /><BR />My EDID<BR /><BR />root@imx8mp-lpddr4-evk:~# cat /sys/class/drm/card1-HDMI-A-1/edid | hexdump -C<BR />00000000 00 ff ff ff ff ff ff 00 04 89 01 00 00 00 00 00 |................|<BR />00000010 01 21 01 04 a5 46 27 78 3a 76 45 ae 51 33 ba 26 |.!...F'x:vE.Q3.&amp;|<BR />00000020 0d 50 54 01 00 00 01 01 01 01 01 01 01 01 01 01 |.PT.............|<BR />00000030 01 01 01 01 01 01 40 17 40 80 61 e0 14 10 58 90 |......@.@.a...X.|<BR />00000040 37 00 ba 89 21 00 00 1e 00 00 00 ff 00 47 4d 53 |7...!........GMS|<BR />00000050 4c 30 30 31 0a 20 20 20 20 20 00 00 00 fc 00 47 |L001. .....G|<BR />00000060 4d 53 4c 0a 20 20 20 20 20 20 20 20 00 00 00 fd |MSL. ....|<BR />00000070 00 18 4b 1e b4 6c 01 0a 20 20 20 20 20 20 00 d2 |..K..l.. ..|<BR />00000080<BR /><BR /><STRONG>Board :</STRONG> IMX8MP-Lpddr4<BR /><STRONG>Linux :</STRONG> 6.6<BR /><BR /></LI></OL> Wed, 15 Apr 2026 07:12:16 GMT https://community.nxp.com/t5/i-MX-Processors/Custom-HDMI-Resolution-Configuration-Issue-on-i-MX8M-Plus/m-p/2351198#M244897 SanthoshRajavel 2026-04-15T07:12:16Z Re: Custom HDMI Resolution Configuration Issue on i.MX8M Plus https://community.nxp.com/t5/i-MX-Processors/Custom-HDMI-Resolution-Configuration-Issue-on-i-MX8M-Plus/m-p/2351832#M244903 <P>what pixel clock do you need for resolution&nbsp;1600×480? pls check your log and offer the correct pixel clock you need from imx8mp hdmi output</P> Thu, 16 Apr 2026 01:25:22 GMT https://community.nxp.com/t5/i-MX-Processors/Custom-HDMI-Resolution-Configuration-Issue-on-i-MX8M-Plus/m-p/2351832#M244903 joanxie 2026-04-16T01:25:22Z