Bug 112160 - Can't get VGA video on Carrizo R7 gpu, only HDMI
Summary: Can't get VGA video on Carrizo R7 gpu, only HDMI
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/AMDgpu (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: not set major
Assignee: Default DRI bug account
QA Contact:
Depends on:
Reported: 2019-10-28 18:43 UTC by debian
Modified: 2019-11-19 09:59 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

dmesg, xorg log and amdgpu vbios (61.43 KB, application/gzip)
2019-10-28 18:43 UTC, debian
no flags Details

Description debian 2019-10-28 18:43:25 UTC
Created attachment 145837 [details]
dmesg, xorg log and amdgpu vbios

Hello. This is my first time trying to report a bug, I hope I'm in the right place, I tried the amd-gfx list and they sent me here :)

I have a PC with MSI A68HM-E33 V2 motherboard, and AMD A8-7680 CPU with Radeon R7.

I'm running Debian 9 Stretch, Kernel~4.19.0-0.bpo.6-amd64, using amdgpu driver, and I get video only on the HDMI output.

xrandr only lists the HDMI output as connected, and a DVI output disconnected. The motherboard doesn't have DVI connector, only VGA and HDMI.

I tried forcing video output on the DVI interface, but I didn't get any video on VGA port, even though the desktop was arranged to spread across both screens.

I tried several options for the kernel module, such as "exp_hw_support" and "cik_support" didn't fully knowing what they did, to no avail.

Of course I have two monitors plugged in to both connectors, and I ruled out hardware problems (such as burned connector) because I changed the HDD and installed windows, with the official AMD windows drivers I get video working fine on both monitors, so monitors, cables and ports are working.

The motherboard has the latest BIOS available. 

I'm attaching dmesg, Xorg log and vbios.rom as was suggested by amd-gfx

Also I selected "major" as severity because if you don't have an HDMI monitor, you just can't use linux in this motherboard with amdgpu driver.

Comment 1 Martin Peres 2019-11-19 09:59:23 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/947.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.