https://bugs.freedesktop.org/show_bug.cgi?id=94502

Bug ID: 94502 Summary: R9-270 has no video output when underclocked Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: maweki@gmail.com

I have a Radeon R9-270 and I am running Fedora 23 with the default OpenSource drivers supplied with the repository.

Yesterday I did an Update from Kernel 4.3.3-300 to 4.4.3-300 and I started seeing some issues. When I do nothing for about 12 seconds the screens (dual head) turn blank. Moving the mouse makes the screen go back on again. Sometimes the login-screen of the gnome-shell or chrome are frozen but the system as a whole seems fine.

During normal operations /sys/kernel/debug/dri/0/radeon_pm_info is the following: power level 0 sclk: 30000 mclk: 120000 vddc: 950 vddci: 1000 pcie gen: 2

When the screen is still for a bit (exactly when it turns blank) the output is power level 0 sclk: 30000 mclk: 15000 vddc: 900 vddci: 850 pcie gen: 2

So apparently, when the video card is clocked down, the output is deactivated.

My current "workaround" is running videos on the side - not an ideal solution.