I realized that I haven't tested HDMI output on radeon driver (and 17.04 with mainline kernel), so I decided to test it out. Initially, after plugging both VGA monitor (ASUS), and HDMI TV (VOX), HDMI and VGA outputs were showing image (however at 1080i, image was buggy and scrambled at TV screen) while internal monitor was off. After changing TV resolution to 1280x720 image was looking ok.
After changing resolution options, I was able to output image on both VGA and HDMI or internal monitor and HDMI (but never all three or VGA and internal monitor at the same time). So, except that 1080i glitch (which can be seen on provided image), HDMI would always be on and functioning. Interestingly enough, even with same resolution options, VGA and Internal Monitor would work seemingly at random (at first setting of that resolution combination internal monitor would work and VGA wouldn't, but if I set same settings again later VGA would display image and internal wouldn't). I know that you told me not to send logs, but I believe that they might be relevant (especially for HDMI@1080 bug). ** Attachment added: "xorghdmilog.txt" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1553441/+attachment/4804441/+files/xorghdmilog.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1553441 Title: Only one monitor working at the time (xserver-xorg-video-ati) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1553441/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
