Bug 85801 - [Mobility Radeon HD 4570] Enabling HDMI monitor fails with kernel versions 3.17/3.16
Summary: [Mobility Radeon HD 4570] Enabling HDMI monitor fails with kernel versions 3....
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium major
Assignee: Default DRI bug account
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Reported: 2014-11-03 14:07 UTC by Mohammad AlSaleh
Modified: 2015-05-07 10:06 UTC (History)
0 users

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Attachments
dmesg output with the relevant call trace (4.25 KB, text/plain)
2014-11-03 14:07 UTC, Mohammad AlSaleh 		no flags Details
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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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