Ryzen CPU/Vega APU laptop does not detect HDMI dual monitor

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Laurel · #1 Post by **Laurel** » 2018-10-03 06:05

Hey all. I'm delighted to have finally installed Debian on my new Lenovo E585 laptop

. However, when I plug a HDMI monitor to the HDMI port on the monitor, it does not detect the monitor.

root@uni:~# xrandr
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
root@uni:~# xrandr --listproviders
Providers: number : 0

Here's the VGA-related output of my lspci -v

root@uni:~# lspci -v | grep VGA
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 15dd (rev c3) (prog-if 00 [VGA controller])

Any advice on how to solve this problem?

Segfault · #2 Post by **Segfault** » 2018-10-03 08:43

First step, root does not run X. Log in as user.

Laurel · #3 Post by **Laurel** » 2018-10-03 10:37

Hi Segfault, thanks for your help. The results you see were obtained by logging in as a normal user and then invoking su. Not invoking su had the same results.

lshw results in three UNCLAIMED entries, which are listed below:

*-generic UNCLAIMED
description: IOMMU
product: Advanced Micro Devices, Inc. [AMD]
vendor: Advanced Micro Devices, Inc. [AMD]
physical id: 0.2
bus info: pci@0000:00:00.2
version: 00
width: 32 bits
clock: 33MHz
capabilities: msi ht cap_list
configuration: latency=0

*-display UNCLAIMED
description: VGA compatible controller
product: Advanced Micro Devices, Inc. [AMD/ATI]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:05:00.0
version: c3
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix vga_controller bus_master cap_list
configuration: latency=0
resources: memory:b0000000-bfffffff memory:c0000000-c01fffff ioport:1000(size=256) memory:c0800000-c087ffff memory:c0000-dffff

*-generic UNCLAIMED
description: Encryption controller
product: Advanced Micro Devices, Inc. [AMD]
vendor: Advanced Micro Devices, Inc. [AMD]
physical id: 0.2
bus info: pci@0000:05:00.2
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi msix cap_list
configuration: latency=0
resources: memory:c0700000-c07fffff memory:c088c000-c088dfff

bw123 · #4 Post by **bw123** » 2018-10-03 12:16

lscpi has a coulpe of switches, -n -nn and -k that are sometimes helpful. -k can show if the correct kernel driver is being loaded. I would probably rcheck out the entire output instead of grep it for VGA, it's okay to post it, some geeks like to look at hardware info like that. By using grep VGA with the -v switch on lspci, you're editing out the verbose part.

Did you install firmware following the instructions here?
https://wiki.debian.org/AtiHowTo

Do you think maybe the device is too new for stretch kernel? Have you considered testing newer kernel -and- firmware from stretch-backports?

I see you already have a thread on installation on this machine http://forums.debian.net/viewtopic.php? ... 2e#p682292 it's probably a better idea just to keep one thread so you don;t have to repost details.

For posting output from the os, code tags are better than quote blocks. Easier to read. There's also paste.debian.net for very long output, the AtiHowTo link above has instructions for confirming the correct firmware is loading.

Laurel · #5 Post by **Laurel** » 2018-10-03 12:35

Hi bw123, thank you for your help

Here's the output of lspci -k