oh, i also flashed the card bios with the bios provided at:
https://www.xfxforce.com/gpus/xfx-amd-radeon-tm-rx-5600-xt-6gb-gddr6-raw-ii

if you scroll down a bit and click on downloads, they have a link to a
"performance bios". i flashed that, and nothing changed. after the flash,
the card still worked great in windows, and still terrible in linux. so i
guess that flash didnt change anything.

also, fyi i do have the latest linux-firmware installed (since apparently
there was some issue with the firmware for the rx 5600 which was solved in
the latest firmware i guess)

$ md5sum /lib/firmware/amdgpu/navi10_smc.bin
632de739379e484c0233f6808cba2c7f  /lib/firmware/amdgpu/navi10_smc.bin

On Sun, May 17, 2020 at 3:51 PM Javad Karabi <karabijavad@gmail.com> wrote:

> Heres my setup:
>
> kernel: linux-5.6.13
> card: XFX RX 5600 XT Raw II  (
> https://www.bestbuy.com/site/xfx-amd-radeon-rx-5600-xt-raw-ii-pro-6gb-gddr6-pci-express-4-0-graphics-card/6398005.p?skuId=6398005
> )
>
> x1 carbon 7th gen -thunderbolt-> Razer Core X -> rx 5600 xt -> hdmi
> connection to my monitor (asus mg248)
>
> when i boot into windows, the card works totally fine (installed the
> radeon drivers and everything)
>
> when im in linux, the card works, my monitor works, radeontop shows the
> gpu being used when i run DRI_PRIME=1 glxgears, etc etc, so it seems that
> the card is being properly utilized by everything.
>
> one interesting detail: when i install the kernel, update-initramfs
> reports that there is "possibly missing firmware". i dont see any errors in
> dmesg about missing firmware so im assuming thats not a problem?
>
> problem is, its very low fps. for example, heres my glxinfo/glxgears
> output:
>
> $ DRI_PRIME=0 glxgears
> 3148 frames in 5.0 seconds = 628.420 FPS
> 1950 frames in 5.0 seconds = 389.999 FPS
> ^C
> $ DRI_PRIME=1 glxgears
> 755 frames in 5.0 seconds = 150.698 FPS
> 662 frames in 5.0 seconds = 132.296 FPS
> ^C
> $ DRI_PRIME=0 glxinfo | grep vendor
> server glx vendor string: SGI
> client glx vendor string: Mesa Project and SGI
> OpenGL vendor string: Intel
> $ DRI_PRIME=1 glxinfo | grep vendor
> server glx vendor string: SGI
> client glx vendor string: Mesa Project and SGI
> OpenGL vendor string: X.Org
>
> $ dmesg | egrep -i "amdgpu|radeon"
> [    4.798043] amdgpu: unknown parameter 'si_support' ignored
> [    4.802600] amdgpu: unknown parameter 'cik_support' ignored
> [    4.813305] [drm] amdgpu kernel modesetting enabled.
> [    4.813449] amdgpu 0000:0c:00.0: enabling device (0000 -> 0003)
> [    5.051950] amdgpu 0000:0c:00.0: VRAM: 6128M 0x0000008000000000 -
> 0x000000817EFFFFFF (6128M used)
> [    5.051952] amdgpu 0000:0c:00.0: GART: 512M 0x0000000000000000 -
> 0x000000001FFFFFFF
> [    5.052081] [drm] amdgpu: 6128M of VRAM memory ready
> [    5.052084] [drm] amdgpu: 6128M of GTT memory ready.
> [    6.125885] amdgpu 0000:0c:00.0: RAS: ras ta ucode is not available
> [    6.131800] amdgpu: [powerplay] use vbios provided pptable
> [    6.131973] amdgpu: [powerplay] smu driver if version = 0x00000033, smu
> fw if version = 0x00000035, smu fw version = 0x002a3200 (42.50.0)
> [    6.131979] amdgpu: [powerplay] SMU driver if version not matched
> [    6.176170] amdgpu: [powerplay] SMU is initialized successfully!
> [    6.298473] amdgpu 0000:0c:00.0: fb0: amdgpudrmfb frame buffer device
> [    6.310927] amdgpu 0000:0c:00.0: ring gfx_0.0.0 uses VM inv eng 0 on
> hub 0
> [    6.311158] amdgpu 0000:0c:00.0: ring comp_1.0.0 uses VM inv eng 1 on
> hub 0
> [    6.311401] amdgpu 0000:0c:00.0: ring comp_1.1.0 uses VM inv eng 4 on
> hub 0
> [    6.311648] amdgpu 0000:0c:00.0: ring comp_1.2.0 uses VM inv eng 5 on
> hub 0
> [    6.311904] amdgpu 0000:0c:00.0: ring comp_1.3.0 uses VM inv eng 6 on
> hub 0
> [    6.312133] amdgpu 0000:0c:00.0: ring comp_1.0.1 uses VM inv eng 7 on
> hub 0
> [    6.312376] amdgpu 0000:0c:00.0: ring comp_1.1.1 uses VM inv eng 8 on
> hub 0
> [    6.312619] amdgpu 0000:0c:00.0: ring comp_1.2.1 uses VM inv eng 9 on
> hub 0
> [    6.312863] amdgpu 0000:0c:00.0: ring comp_1.3.1 uses VM inv eng 10 on
> hub 0
> [    6.313110] amdgpu 0000:0c:00.0: ring kiq_2.1.0 uses VM inv eng 11 on
> hub 0
> [    6.313355] amdgpu 0000:0c:00.0: ring sdma0 uses VM inv eng 12 on hub 0
> [    6.313585] amdgpu 0000:0c:00.0: ring sdma1 uses VM inv eng 13 on hub 0
> [    6.313821] amdgpu 0000:0c:00.0: ring vcn_dec uses VM inv eng 0 on hub 1
> [    6.314059] amdgpu 0000:0c:00.0: ring vcn_enc0 uses VM inv eng 1 on hub
> 1
> [    6.314298] amdgpu 0000:0c:00.0: ring vcn_enc1 uses VM inv eng 4 on hub
> 1
> [    6.314536] amdgpu 0000:0c:00.0: ring jpeg_dec uses VM inv eng 5 on hub
> 1
> [    6.316101] [drm] Initialized amdgpu 3.36.0 20150101 for 0000:0c:00.0
> on minor 1
> [   10.797203] snd_hda_intel 0000:0c:00.1: bound 0000:0c:00.0 (ops
> amdgpu_dm_audio_component_bind_ops [amdgpu])
>
> is this perhaps a power management issue?
> i can include my kernel config and X logs etc if yall need.
>
>