https://bugzilla.kernel.org/show_bug.cgi?id=200633
Bug ID: 200633 Summary: [Regression] VGA not being detected with R9 380 using AMDGPU after 4.17 kernel update. Product: Drivers Version: 2.5 Kernel Version: 4.17 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: low Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: syboxez@gmail.com Regression: No
OS: Debian Sid Kernel: 4.17.8 GPU: AMD R9 380 Mesa version: 18.1.4
After upgrading from 4.16 to 4.17 (this bug was also reproduced on 4.18-RC3), xrandr reports VGA displays (normally DVI-I-1 in my case) as digital displays (DVI-D-1), and will display a black screen on the monitor I am attempting to use. In 4.16, it worked perfectly. Booting the system with the 4.16 kernel resolves the issue.
I will be happy to collect any useful logs upon request, as I'm not too sure what to look for.
https://bugzilla.kernel.org/show_bug.cgi?id=200633
syboxez@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Regression|No |Yes
https://bugzilla.kernel.org/show_bug.cgi?id=200633
--- Comment #1 from Michel Dänzer (michel@daenzer.net) --- Please attach the dmesg output and Xorg log file corresponding to the problem.
amdgpu.dc=0 on the kernel command line might serve as a workaround for the time being.
https://bugzilla.kernel.org/show_bug.cgi?id=200633
--- Comment #2 from syboxez@gmail.com --- dmesg: https://ghostbin.com/paste/7pyty Xorg: https://ghostbin.com/paste/38zyy
amdgpu.dc=0 does indeed make the issue go away, so I'm guessing DC was turned on by default for Tonga in this kernel.
https://bugzilla.kernel.org/show_bug.cgi?id=200633
--- Comment #3 from Michel Dänzer (michel@daenzer.net) --- (In reply to syboxez from comment #2)
dmesg: https://ghostbin.com/paste/7pyty Xorg: https://ghostbin.com/paste/38zyy
Thanks, but please attach files here directly instead of referencing an external pastebin site.
https://bugzilla.kernel.org/show_bug.cgi?id=200633
--- Comment #4 from syboxez@gmail.com --- Created attachment 277521 --> https://bugzilla.kernel.org/attachment.cgi?id=277521&action=edit dmesg log
https://bugzilla.kernel.org/show_bug.cgi?id=200633
--- Comment #5 from syboxez@gmail.com --- Created attachment 277523 --> https://bugzilla.kernel.org/attachment.cgi?id=277523&action=edit Xorg log
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