Bug 99181

Summary: RS780 blank screen on boot
Product: DRI Reporter: Chí-Thanh Christopher Nguyễn <chithanh>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact: Christopher M. Penalver <christopher.m.penalver>
Severity: normal    
Priority: medium CC: christopher.m.penalver
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: All   
URL: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651910
See Also: https://bugzilla.kernel.org/show_bug.cgi?id=91861
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg from kernel 3.14 with drm.debug=15 (working)
none
dmesg from kernel 4.9 with drm.debug=15 (not working) none

Description Chí-Thanh Christopher Nguyễn 2016-12-22 11:25:28 UTC 
Hardware: BIOSTAR A780L

When booting with 3.15 or newer kernels, a monitor connected to the DVI port of the BIOSTAR A780L will stay blank.
Kernel 3.14 and older work fine.

I tried forcing the output to on with video=HDMI-A-1:e but this made no difference.
Comment 1 Chí-Thanh Christopher Nguyễn 2016-12-22 11:26:57 UTC 
Created attachment 128629 [details]
dmesg from kernel 3.14 with drm.debug=15 (working)
Comment 2 Chí-Thanh Christopher Nguyễn 2016-12-22 11:27:30 UTC 
Created attachment 128630 [details]
dmesg from kernel 4.9 with drm.debug=15 (not working)
Comment 3 Chí-Thanh Christopher Nguyễn 2016-12-22 19:11:02 UTC 
https://bugzilla.kernel.org/show_bug.cgi?id=91861 seems to be related, however this issue still happens with kernel 4.9
Comment 4 Christopher M. Penalver 2016-12-25 17:00:23 UTC 
Commit bisect requested in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651910/comments/25 .
Comment 5 Martin Peres 2019-11-19 09:21:00 UTC 
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