[Bug 112160] New: Can't get VGA video on Carrizo R7 gpu, only HDMI

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Oct 28 18:43:25 UTC 2019


            Bug ID: 112160
           Summary: Can't get VGA video on Carrizo R7 gpu, only HDMI
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: not set
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: debian at monssa.com.ar
        QA Contact: xorg-team at lists.x.org

Created attachment 145837
  --> https://bugs.freedesktop.org/attachment.cgi?id=145837&action=edit
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

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

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.


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