Bug 85801

Summary: [Mobility Radeon HD 4570] Enabling HDMI monitor fails with kernel versions 3.17/3.16
Product: DRI Reporter: Mohammad AlSaleh <CE.Mohammad.AlSaleh>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED FIXED QA Contact:
Severity: major    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg output with the relevant call trace none

Description Mohammad AlSaleh 2014-11-03 14:07:15 UTC
Created attachment 108839 [details]
dmesg output with the relevant call trace

With kernel version 3.17.2, when I connect my HDMI monitor, it shows up correctly in xrandr. But when I try to enable it, Xorg freezes and becomes a zombie process, and the HDMI monitor stays blank. dmesg hints radeon kernel code is at fault (attached).

Luckily, the system does not completely freeze. I can still connect to the system through ssh. So I can provide more information if needed.

I remember having similar issues with 3.16 when I tried it. I'm currently using 3.15.5 which does not suffer from this bug.

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