Bug 94502

Summary: R9-270 has no video output when underclocked
Product: DRI Reporter: Mario Wenzel <maweki>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact:
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Mario Wenzel 2016-03-11 18:59:42 UTC 
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.
Comment 1 Martin Peres 2019-11-19 09:13:53 UTC 
-- GitLab Migration Automatic Message --

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