{"action":"created","issue":{"url":"https://api.github.com/repos/raspberrypi/firmware/issues/591","repository_url":"https://api.github.com/repos/raspberrypi/firmware","labels_url":"https://api.github.com/repos/raspberrypi/firmware/issues/591/labels{/name}","comments_url":"https://api.github.com/repos/raspberrypi/firmware/issues/591/comments","events_url":"https://api.github.com/repos/raspberrypi/firmware/issues/591/events","html_url":"https://github.com/raspberrypi/firmware/issues/591","id":151162093,"number":591,"title":"SET_OVERSCAN arguments are no longer the same as /boot/config.txt","user":{"login":"Ealdwulf","id":37270,"avatar_url":"https://avatars.githubusercontent.com/u/37270?v=3","gravatar_id":"","url":"https://api.github.com/users/Ealdwulf","html_url":"https://github.com/Ealdwulf","followers_url":"https://api.github.com/users/Ealdwulf/followers","following_url":"https://api.github.com/users/Ealdwulf/following{/other_user}","gists_url":"https://api.github.com/users/Ealdwulf/gists{/gist_id}","starred_url":"https://api.github.com/users/Ealdwulf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Ealdwulf/subscriptions","organizations_url":"https://api.github.com/users/Ealdwulf/orgs","repos_url":"https://api.github.com/users/Ealdwulf/repos","events_url":"https://api.github.com/users/Ealdwulf/events{/privacy}","received_events_url":"https://api.github.com/users/Ealdwulf/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2016-04-26T15:14:24Z","updated_at":"2016-04-27T14:36:48Z","closed_at":null,"body":"If you use the firmware interface, as we do here: https://github.com/KanoComputing/kano-settings/blob/jessie/overscan/overscan.c\r\nto set the overscan settings, it used to be the case that the individual arguments set the bottom, top, left right distance, as they do in /boot/config.txt. But on the most recent raspbian, and also the most recent firmware from rpi-update, if you set only one argument and leave the others zero, once it gets above some threshhold, the other arguments also increase. I'm not sure when this changed.\r\n\r\n I thought this might be the intended behavior, except that /boot/config.txt does not seem to do the same. What happens is that if you increase 'left' then 'right' is the only distance which doesn't change, etc.\r\n\r\nTo reproduce:\r\n* Download https://github.com/KanoComputing/kano-settings/blob/master/overscan/overscan.c\r\n* `gcc -Wall -std=c99 -o overscan overscan.c`\r\n* `for ((i=0;i<100; i++)) ; do ./overscan $i 0 0 0   ; done`\r\n\r\nThis means that SET_OVERSCAN can not be used any more to give a live demonstration of what setting the config entries will do."},"comment":{"url":"https://api.github.com/repos/raspberrypi/firmware/issues/comments/215103990","html_url":"https://github.com/raspberrypi/firmware/issues/591#issuecomment-215103990","issue_url":"https://api.github.com/repos/raspberrypi/firmware/issues/591","id":215103990,"user":{"login":"popcornmix","id":1053730,"avatar_url":"https://avatars.githubusercontent.com/u/1053730?v=3","gravatar_id":"","url":"https://api.github.com/users/popcornmix","html_url":"https://github.com/popcornmix","followers_url":"https://api.github.com/users/popcornmix/followers","following_url":"https://api.github.com/users/popcornmix/following{/other_user}","gists_url":"https://api.github.com/users/popcornmix/gists{/gist_id}","starred_url":"https://api.github.com/users/popcornmix/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/popcornmix/subscriptions","organizations_url":"https://api.github.com/users/popcornmix/orgs","repos_url":"https://api.github.com/users/popcornmix/repos","events_url":"https://api.github.com/users/popcornmix/events{/privacy}","received_events_url":"https://api.github.com/users/popcornmix/received_events","type":"User","site_admin":false},"created_at":"2016-04-27T14:36:48Z","updated_at":"2016-04-27T14:36:48Z","body":"You say \"no longer\". Can you point to an older firmware that behaved differently?\r\nAre you using ``disable_overscan=1`` in config.txt?\r\nThat would likely make behaviour more consistent, otherwise the default is overscan=48,48,48,48.\r\nNote that aspect ratio is framebuffer is preserved. That is why \"right\" parameter may change when \"top\" changes.\r\n\r\n\r\n\r\n"}}