Bug 107913

Summary: amdgpu_drv.so segfaults on boot; black screen
Product: xorg Reporter: freedesktop
Component: Driver/AMDgpuAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Xorg.0.log including the segfoult none

Description freedesktop 2018-09-12 22:42:01 UTC 
Created attachment 141539 [details]
Xorg.0.log including the segfoult

History (maybe only partly related to the problem):
I followed this guide to update my drivers: https://github.com/ValveSoftware/Proton/blob/proton_3.7/PREREQS.md

sudo add-apt-repository ppa:paulo-miguel-dias/mesa
sudo apt dist-upgrade
sudo apt install mesa-vulkan-drivers mesa-vulkan-drivers:i386

which worked fine for some days. I updated my system as normal (via apt) and after a reboot the machine came up with a black screen.

I found a segfault in my Xorg.0.log (attached). Blacklisting the module "amdgpu" lets me boot into the desktop using only the integrated Intel GPU.

Some information that are hopefully helpful:

$ lspci -k
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
	Subsystem: Dell HD Graphics 620
	Kernel driver in use: i915
	Kernel modules: i915
01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445] (rev c3)
	Subsystem: Dell Radeon R7 M445
	Kernel modules: amdgpu

$ uname -a
Linux notebook-kai 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

My PC is a notebook with an integrated Intel GPU and a dedicated AMD GPU.
OS is Linux Mint 19 Cinnamon
CPU is Intel© Core™ i7-7500U CPU @ 2.70GHz × 2

What else is needed?
Can I somehow re-install or downgrade the amdgpu-drivers?
Comment 1 Michel Dänzer 2018-09-13 08:58:27 UTC 
Please also attach the corresponding dmesg output.

Please install the xserver-xorg-video-amdgpu-dbg package, attach a new Xorg log file from running with that installed, and either get a backtrace with gdb (per https://www.x.org/wiki/Development/Documentation/ServerDebugging/), or provide the output of the following commands:

 addr2line -e /usr/lib/xorg/modules/drivers/amdgpu_drv.so 0x7f9e326d3000+0x17305
 addr2line -e /usr/lib/xorg/modules/drivers/amdgpu_drv.so 0x7f9e326d3000+0xedfd

For the time being, assuming there are no display connectors on the AMD GPU (that you need to use), you can avoid the problem by putting this in /etc/X11/xorg.conf:

Section "ServerFlags"
       Option  "AutoAddGPU" "off"
EndSection
Comment 2 Michel Dänzer 2018-09-13 09:52:17 UTC 
I was able to reproduce the crash (it only happens when the kernel driver doesn't expose any display outputs), https://patchwork.freedesktop.org/patch/249254/ fixes it.
Comment 3 Michel Dänzer 2018-09-13 14:35:29 UTC 
Thanks for the report, fixed in Git master:

commit 6572be49b713a26eca14f16e1854cabf28101288
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Thu Sep 13 11:44:21 2018 +0200

    Bail from drmmode_cm_init if there's no CRTC
Comment 4 freedesktop 2018-09-13 19:35:00 UTC 
Thanks a lot for the fix, that was pretty quick!

Is any of the requested information still relevant? Maybe for documentation purpose?
Comment 5 Michel Dänzer 2018-09-14 07:33:17 UTC 
(In reply to freedesktop from comment #4)
> Is any of the requested information still relevant? Maybe for documentation
> purpose?

Thanks for asking, but it's not needed anymore.

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