Fixing the typo in the command line video (such that it says "video=HDMI-A-1:1280x720@60D") still had no effect on the output.
But I found the issue.
I suspected, but didn't have the means to test, that the micro-HDMI adapter I was using was complete rubbish and couldn't handle the signaling rates for resolutions above 1080P. Using a different micro-HDMI cable, I can confirm that's what was happening.
So since I am unable to force a video mode, Linux was choosing the "best" resolution for the display, which the adapter I was using couldn't handle. The firmware didn't have this issue because it always chose a safe resolution.
But I found the issue.
I suspected, but didn't have the means to test, that the micro-HDMI adapter I was using was complete rubbish and couldn't handle the signaling rates for resolutions above 1080P. Using a different micro-HDMI cable, I can confirm that's what was happening.
So since I am unable to force a video mode, Linux was choosing the "best" resolution for the display, which the adapter I was using couldn't handle. The firmware didn't have this issue because it always chose a safe resolution.
Statistics: Posted by illucid-matthew — Tue Dec 17, 2024 1:12 pm