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 Desktop Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1553441 Title: Only one monitor working at the time (xserver-xorg-video-ati) Status in xserver-xorg-video-ati package in Ubuntu: Incomplete Bug description: When external monitor is connected to VGA port (AMD Radeon 7470m) internal laptop monitor stops working. I'm able to set laptop monitor as primary which disables external monitor (and vice-versa). Tried manual switch to mainline Linux 4.5 kernel, same thing. Tested on 14.04, 15.10, 16.04 with same results. WORKAROUND: Use Ubuntu 14.04 with fglrx. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 Uname: Linux 4.5.0-040500rc6-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.20-0ubuntu3 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Sat Mar 5 04:32:48 2016 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: virtualbox, 5.0.14, 4.4.0-10-generic, x86_64: installed virtualbox, 5.0.14, 4.4.0-8-generic, x86_64: installed virtualbox, 5.0.14, 4.5.0-040500rc6-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7640G] [1002:9903] (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Trinity [Radeon HD 7640G] [1043:106b] Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] [1002:6760] (rev ff) (prog-if ff) InstallationDate: Installed on 2016-02-18 (15 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: ASUSTeK COMPUTER INC. K55DR ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.5.0-040500rc6-generic root=UUID=e0064410-4660-40b7-b961-76f320a921a6 ro amdgpu.powerplay=1 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/07/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 217 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: K55DR dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr217:bd09/07/2012:svnASUSTeKCOMPUTERINC.:pnK55DR:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnK55DR:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: K55DR dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.18.1-1ubuntu3 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Sat Mar 5 04:27:41 2016 xserver.configfile: default xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension. xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.18.1-1ubuntu3 xserver.video_driver: radeon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1553441/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
