Created attachment 864966 [details] X.org log from the boot where X did not actually manage to display anything Description of problem: If I boot the latest kernel version on my desktop system, it otherwise boots normally but when GDM is expected to show up, the display just goes off. My guess is that there just is no signal being output into the display. In this state, the computer can still be turned off in a controlled manner, by pressing ctrl-alt-f2 and ctrl-alt-del. So it looks like most of the system is still running normally despite me not getting any video output. If I boot an earlier kernel, graphics still work completely normally. Version-Release number of selected component (if applicable): kernel-3.12.10-300.fc20.x86_64 (works) kernel-3.13.3-201.fc20.x86_64 (does not work) xorg-x11-drv-ati-7.2.0-3.20131101git3b38701.fc20.x86_64 How reproducible: Seems to happen every time. Steps to Reproduce: 1. Install F20 and latest updates 2. Boot with kernel-3.13.3-201.fc20.x86_64 3. Wait for GDM to show up Actual results: When GDM is expected to be displayed, the display device just switches itself off. Expected results: Graphics as usuall
Created attachment 864967 [details] Text from systemd journal of a boot cycle where the issue happened
Same issues with KDE.
Created attachment 865772 [details] xorg.0.log
Created attachment 865773 [details] lspci of vga hardware
Created attachment 866980 [details] Output of journalctl -b with kernel-3.13.4-200.fc20.x86_64
This problem seems to still be present for me in kernel-3.13.4-200.fc20.x86_64 that I got from updates-testing. Please note if it is a bad idea to post the journalctl output for every kernel version that I test.
With the upstream kernel git repository, I bisected this problem to start to occur from commit ad41550666f89b5af9335fcde9e98b61190daf99 onwards. According to the commit message, it enables HDMI audio by default for the radeon driver. This seems to break the driver on my system. As a workaround, the radeon.audio=0 boot parameter can be used to disable the HDMI audio functionality. After doing so, graphics work again for me.
I did a net install of fedora 20 and the video now works. I also see the amd gpu reports properly.
I had quite the same problem with a 4550 : Could only boot with nomodeset or i would get a black screen, but with radeon.audio=0 I can boot.
With kernel kernel-3.14.8-200.fc20.x86_64 when laptop goes to sleep, it goes to sleep fine, but on start up from sleep, laptop screen does not turn on, or is anything responsive, like hitting the power button to shutdown. Holding the power button and restarting, it comes back fine. No errors I can fine from the sleep to start.
This sounds like my issue, though I'm not sure. Next time I upgrade kernel I'll try comment 9 nomodeset & radeon.audio=0. Without proprietary drivers, my system boots to X, but there is only a black background and a lonely mouse cursor. The mouse works, but there's no DM to log in with. I'm using lightdm, BTW. I'm not sure when this started, but it wasn't this way when I installed F20, so it's a bug introduced to this "stable" release.
Oh, forgot to mention I have two 7870 cards; could be relevant.
Can you go back to a 3.14 kernel. I am not able to run on a 3.15 kernel, as it kernel dumps on startup.
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