I have an 6700 Xt in a external GPU box (eGPU Breakaway Box 750) connected with ThinkPad L13 Yoga Gen 2 (intel an i5 11th generation) via thunderbolt4 connection.
I have dual boot installation (windows and Ubuntu 20.04.3 LTS, kernel 5.11.0-44-generic).
I have installed the driver for the eGPU on windows and it works fine.
I have problems when installing the GPU on Ubuntu. I followed the instructions for the amdgpu installation
sudo apt-get install ./amdgpu-install_21.40.1.40501-1_all.deb
sudo apt-get update
amdgpu-uninstall
The GPU seems to be correctly installed (see lspci -v below).
The screen connected to the GPU turns on and display the extended display as it should.
When it is time to login (just after starting Ubuntu), when I have the prompt to ask for identification. But as soon as I log in, the screen turns off. I can also see the GPU turning off too (fan and the LED). The funny thing is that when I enter lspci -v the GPU turns on as well just for a few seconds.
I also tried the instruction on this post but it did not help: https://www.linux.org/threads/solved-im-new-to-linux-and-im-having-a-problem-with-my-gpu.36833/
I thought it was some right issue but my user name is already in the video group (when entering groups in the terminal I get this adm cdrom sudo dip video plugdev lpadmin lxd sambashare just after my username)
Anyone has any idea?
This is an extract of the output I get when I enter lspci -v:
20:00.0 PCI bridge: Intel Corporation JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016] (rev 02) (prog-if 00 [Normal decode])
Physical Slot: 0
Flags: bus master, fast devsel, latency 0, IRQ 16
Bus: primary=20, secondary=21, subordinate=24, sec-latency=0
I/O behind bridge: 00003000-00003fff [size=4K]
Memory behind bridge: a2000000-a22fffff [size=3M]
Prefetchable memory behind bridge: 0000004200000000-00000047ffffffff [size=24G]
Capabilities: <access denied>
Kernel driver in use: pcieport
21:01.0 PCI bridge: Intel Corporation JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016] (rev 02) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 126
Bus: primary=21, secondary=22, subordinate=24, sec-latency=0
I/O behind bridge: 00003000-00003fff [size=4K]
Memory behind bridge: a2000000-a22fffff [size=3M]
Prefetchable memory behind bridge: 0000004200000000-00000047ffffffff [size=24G]
Capabilities: <access denied>
Kernel driver in use: pcieport
22:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstream Port of PCI Express Switch (rev c1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at a2200000 (32-bit, non-prefetchable) [size=16K]
Bus: primary=22, secondary=23, subordinate=24, sec-latency=0
I/O behind bridge: 00003000-00003fff [size=4K]
Memory behind bridge: a2000000-a21fffff [size=2M]
Prefetchable memory behind bridge: 0000004200000000-00000047ffffffff [size=24G]
Capabilities: <access denied>
Kernel driver in use: pcieport
23:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downstream Port of PCI Express Switch (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 127
Bus: primary=23, secondary=24, subordinate=24, sec-latency=0
I/O behind bridge: 00003000-00003fff [size=4K]
Memory behind bridge: a2000000-a21fffff [size=2M]
Prefetchable memory behind bridge: 0000004200000000-00000047ffffffff [size=24G]
Capabilities: <access denied>
Kernel driver in use: pcieport
24:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT / 6800M] (rev c1) (prog-if 00 [VGA controller])
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 0e36
Flags: bus master, fast devsel, latency 0, IRQ 157
Memory at 4400000000 (64-bit, prefetchable) [size=16G]
Memory at 4200000000 (64-bit, prefetchable) [size=2M]
I/O ports at 3000
Memory at a2000000 (32-bit, non-prefetchable) [size=1M]
Expansion ROM at a2120000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
24:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 HDMI Audio [Radeon RX 6800/6800 XT / 6900 XT]
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 HDMI Audio [Radeon RX 6800/6800 XT / 6900 XT]
Flags: bus master, fast devsel, latency 0, IRQ 173
Memory at a2100000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
