Been struggling to set up my machine Thinkpad P52s ( Intel UHD 620 (i7 8550U)+ Nvidia Quadro P500) - running Ubuntu 20.04 to show proper 10bit per channel (RGB) on a compatible display ( ASUS PA329C - cheapest true 10 bit per channel compatible panel).
When I set up xorg ( a file in /usr/share/X11/xorg.conf.d/30-screensetup.conf as in https://linuxreviews.org/HOWTO_enable_10-bit_color_on_Linux) my red and blue colors get inverted. Even though my Xorg log says "using depth/fbpp 30/32" It is still not true 10 bit color.
Ref: I used the guide/files from below:
https://www.avsforum.com/threads/10-bit-gradient-test-patterns.2269338/
https://www.eizo-apac.com/support-service/tech-library/monitor-test
and several others...
All drivers appear correctly installed... Nvidia-Xserver also shows XScreen 0 setup with correct color depth
lshw -c display:
GNU nano 4.8 lshwout.txt
*-display
description: VGA compatible controller
product: UHD Graphics 620
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:159 memory:e7000000-e7ffffff memory:c0000000-cfffffff ioport:e000(size=64) memory:c0000-dffff
*-display
description: 3D controller
product: GP108GLM [Quadro P500 Mobile]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=nvidia latency=0
resources: irq:168 memory:e8000000-e8ffffff memory:70000000-7fffffff memory:80000000-81ffffff ioport:d000(size=128)
Xorg.0.log
13.740] ABI class: X.Org ANSI C Emulation, version 0.4
[ 13.740] (II) Loading sub module "ramdac"
[ 13.740] (II) LoadModule: "ramdac"
[ 13.740] (II) Module "ramdac" already built-in
[ 13.741] (WW) Falling back to old probe method for modesetting
[ 13.751] (WW) Falling back to old probe method for fbdev
[ 13.751] (II) Loading sub module "fbdevhw"
[ 13.751] (II) LoadModule: "fbdevhw"
[ 13.751] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 13.751] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 13.751] compiled for 1.20.9, module version = 0.0.2
[ 13.751] ABI class: X.Org Video Driver, version 24.1
[ 13.767] (II) modeset(G0): using drv /dev/dri/card0
[ 13.767] (II) NVIDIA(0): Creating default Display subsection in Screen section
"Default Screen" for depth/fbbpp 30/32
[ 13.767] (**) NVIDIA(0): Depth 30, (--) framebuffer bpp 32
[ 13.767] (==) NVIDIA(0): RGB weight 101010
[ 13.767] (==) NVIDIA(0): Default visual is TrueColor
[ 13.767] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[ 13.768] (II) Applying OutputClass "nvidia" options to /dev/dri/card1
[ 13.768] (II) Applying OutputClass "Nvidia Prime" options to /dev/dri/card1
[ 13.768] (**) NVIDIA(0): Option "AllowEmptyInitialConfiguration"
[ 13.768] (**) NVIDIA(0): Enabling 2D acceleration
[ 13.768] (II) Loading sub module "glxserver_nvidia"
[ 13.768] (II) LoadModule: "glxserver_nvidia"
[ 13.768] (II) Loading /usr/lib/x86_64-linux-gnu/nvidia/xorg/libglxserver_nvidia.so
[ 13.790] (II) Module glxserver_nvidia: vendor="NVIDIA Corporation"
[ 13.790] compiled for 1.6.99.901, module version = 1.0.0
[ 13.790] Module class: X.Org Server Extension
[ 13.790] (II) NVIDIA GLX Module 460.80 Fri May 7 06:50:15 UTC 2021
[ 13.791] (II) NVIDIA: The X server supports PRIME Render Offload.
[ 13.792] (II) NVIDIA(0): NVIDIA GPU Quadro P500 (GP108GL-A) at PCI:2:0:0 (GPU-0)
[ 13.792] (--) NVIDIA(0): Memory: 2097152 kBytes
[ 13.792] (--) NVIDIA(0): VideoBIOS: 86.08.28.00.63
[ 13.792] (II) NVIDIA(0): Detected PCI Express Link width: 4X
[ 13.792] (II) NVIDIA(0): Validated MetaModes:
[ 13.792] (II) NVIDIA(0): "NULL"
[ 13.792] (II) NVIDIA(0): Virtual screen size determined to be 640 x 480
[ 13.792] (WW) NVIDIA(0): Unable to get display device for DPI computation.
[ 13.792] (==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
[ 13.792] (II) modeset(G0): Creating default Display subsection in Screen section
"Default Screen" for depth/fbbpp 30/32
xwininfo shows below. Funny that it shows same /similar in 24 bit depth. Sometimes depth 30 sometimes 32.. not sure if it includes alpha channel and shows buffer size instead? Can I change framebuffer size to 40 to ensure I get RGBA as each 10 bit and would that solve it?
xwininfo as run in depth = 24 xorg session:
xwininfo: Please select the window about which you
would like information by clicking the
mouse in that window.
xwininfo: Window id: 0x3e0000a "rime@RimezWorkstation: ~"
Absolute upper-left X: 39
Absolute upper-left Y: 12
Relative upper-left X: 39
Relative upper-left Y: 12
Width: 2596
Height: 1487
Depth: 32
Visual: 0xa2
Visual Class: TrueColor
Border width: 0
Class: InputOutput
Colormap: 0x3e00009 (not installed)
Bit Gravity State: NorthWestGravity
Window Gravity State: NorthWestGravity
Backing Store State: NotUseful
Save Under State: no
Map State: IsViewable
Override Redirect State: no
Corners: +39+12 -1205+12 -1205-661 +39-661
-geometry 230x63+39+12
nvidia-smi gives :
Sun Jun 20 15:05:58 2021
+---------------------------------------------+
| NVIDIA-SMI 460.80 Driver Version: 460.80 CUDA Version: 11.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 Quadro P500 Off | 00000000:02:00.0 Off | N/A |
| N/A 63C P0 N/A / N/A | 358MiB / 2002MiB | 18% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+---------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 1528 G /usr/lib/xorg/Xorg 246MiB |
| 0 N/A N/A 2149 G /usr/bin/gnome-shell 111MiB |
+---------------------------------------------+
nvidia-prime.conf inside xorg.conf.d is like below:
Section "OutputClass"
Identifier "Nvidia Prime"
MatchDriver "nvidia-drm"
Driver "nvidia"
Option "AllowEmptyInitialConfiguration"
Option "IgnoreDisplayDevices" "CRT"
Option "PrimaryGPU" "Yes"
ModulePath "/lib/x86_64-linux-gnu/nvidia/xorg"
EndSection
gpu manager log looks like:
GNU nano 4.8 /var/log/gpu-manager.log
log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
can't access /opt/amdgpu-pro/bin/amdgpu-pro-px
Looking for nvidia modules in /lib/modules/5.4.0-74-generic/updates/dkms
Looking for amdgpu modules in /lib/modules/5.4.0-74-generic/updates/dkms
Is nvidia loaded? yes
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is intel loaded? yes
Is radeon loaded? no
Is radeon blacklisted? no
Is amdgpu loaded? no
Is amdgpu blacklisted? no
Is amdgpu versioned? no
Is amdgpu pro stack? no
Is nouveau loaded? no
Is nouveau blacklisted? yes
Is nvidia kernel module available? no
Is amdgpu kernel module available? no
Vendor/Device Id: 8086:5917
BusID "PCI:0@0:2:0"
Is boot vga? yes
Vendor/Device Id: 10de:1d33
BusID "PCI:2@0:0:0"
can't open /sys/bus/pci/devices/0000:02:00.0/boot_vga
Is boot vga? no
can't open /sys/bus/pci/devices/0000:02:00.0/boot_vga
can't access /etc/u-d-c-nvidia-runtimepm-override file
Found json file: /usr/share/doc/nvidia-driver-460/supported-gpus.json
Looking for device ID "0x1d33" in json file
Device ID 0x1D33 found in json file
Device name: Quadro P500
Looking for availability of "runtimepm" feature
"runtimepm" feature not found
Linux 5.4 detected.
Is nvidia runtime pm supported for "0x1d33"? no
Checking power status in /proc/driver/nvidia/gpus/0000:02:00.0/power
Runtime D3 status: Disabled
Is nvidia runtime pm enabled for "0x1d33"? no
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Skipping "/dev/dri/card0", driven by "i915"
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Skipping "/dev/dri/card0", driven by "i915"
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Skipping "/dev/dri/card0", driven by "i915"
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Found "/dev/dri/card0", driven by "i915"
output 0:
card0-eDP-1
output 1:
card0-DP-1
Number of connected outputs for /dev/dri/card0: 2
Does it require offloading? yes
last cards number = 2
Has amd? no
Has intel? yes
Has nvidia? yes
How many cards? 2
Has the system changed? No
Intel IGP detected
NVIDIA hybrid system
Creating /usr/share/X11/xorg.conf.d/11-nvidia-prime.conf
Setting power control to "on" in /sys/bus/pci/devices/0000:02:00.0/power/control
I must say that color inversion is problem only when under PRIME Profiles NVIDIA Xserver settings are set to high performance ( i.e. NVIDIA as primary GPU?) When switching to 'on demand' profile color inversion issue goes away but it takes away my control of setting X Screen depth from Nvidia card. I only get GPU settings and no X Screen Display configuration settings anymore.
But in any case not getting true 10 colors :( . Please help.
