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#1 2018-08-19 16:33:32

urucod
Member
Registered: 2018-08-19
Posts: 11

Black screen at SDDM on ATI/Radeon R7

Some updates ago I started to have some issues on SSDM init, arch seems to boot well but I see a black screen instead of SSDM.

The thing is that the error doesn't happen at each boot and I see the same errors when it starts correctly than it doesn't. Investigating I found that I have two ATI controllers, the lspci -v | grep Radeon shows me:

VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wani [Radeon R5/R6/R7 Graphics] (rev c8) (prog-if 00 [VGA controller])

Subsystem: Dell Wani [Radeon R5/R6/R7 Graphics]

Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445] (rev c3)

Subsystem: Dell Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445]

I collect the log of dmesg on correct boot and when it fails:

- correct dmesg https://pastebin.com/wCXbDUw9

- broken dmesg https://pastebin.com/yddgNd2X

Also, I collect the log of some commands that could be useful:

- broken ps aux https://pastebin.com/b2zytrsX

- broken journalctl https://pastebin.com/4i5nH4Lw

Say me if you need more information, thank you for your help smile

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#2 2018-08-20 07:17:00

pb
Member
From: Krakow, PL
Registered: 2014-12-26
Posts: 336
Website

Re: Black screen at SDDM on ATI/Radeon R7

Completely black or almost unseen? I see, that you are amdgpu and kernel ver 4.18 user. So, maybe try start system with:

amdgpu.dc=0

parameter.
Some changes in acpi_backlight maybe neccessary also (I had to change it to native).

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#3 2018-08-29 21:35:05

urucod
Member
Registered: 2018-08-19
Posts: 11

Re: Black screen at SDDM on ATI/Radeon R7

Sorry for the delay but the bug is intermittent, this definitely doesn't solve the issue because the screen isn't flickering instead it holds totally black.
By magic art, when it happens I can init well after some reboots but I haven't found the problem source yet.
I'm capable to access to others tty's when it happens, so tell me if you know where can I find more concrete information

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