Hello,
I have found issue with low brightness on HDMI output with Linux driver - Athlon 3000G with integrated graphics Raven 2, motherboard Gigabyte B450 I AORUS PRO WIFI.
Below you can see comparison of screen pictures taken with camera. In all cases monitor settings are the same.
(Monitor OSD menu is obviously looking the same on all pictures because it is inserted into the screen by monitor itself.)
Is there any way, how to get correct graphics output with common Linux distributions like Ubuntu, Mint,... ???
Correct brightness - Athlon 3000G - Linux PureOS (only one distribution with correct brightness, it uses only free open source driver):
low brightness - Athlon 3000G - most of Linux distributions, tried Linux Mint, Fedora, Alma Linux also FreeBSD:
correct brightness - different hardware - Linux Mint:
Output of "xrandr --verbose" on AMD 3000G Linux Mint:
HDMI-A-0 connected primary 1920x1200+0+0 (0x56) normal (normal left inverted right x axis y axis) 519mm x 324mm
Identifier: 0x52
Timestamp: 31494
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0038a3d76801010101
2018010380342078ea4ca5a7554da226
10505423080081008140818081c09500
9040b300d100283c80a070b023403020
360007442100001a000000fd00383d1f
4d11000a202020202020000000fc0045
41323434574d690a20202020000000ff
0034383134353733354e420a2020012a
020317f1449004010323090707830100
0065030c001000011d007251d01e206e
28550007442100001e8c0ad08a20e02d
10103e96000744210000180000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
000000000000000000000000000000dc
GAMMA_LUT_SIZE: 4096
range: (0, -1)
DEGAMMA_LUT_SIZE: 4096
range: (0, -1)
GAMMA_LUT: 0
range: (0, 65535)
CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0
0 1
DEGAMMA_LUT: 0
range: (0, 65535)
TearFree: auto
supported: off, on, auto
HDCP Content Type: HDCP Type0
supported: HDCP Type0, HDCP Type1
Content Protection: Undesired
supported: Undesired, Desired, Enabled
vrr_capable: 0
range: (0, 1)
max bpc: 8
range: (8, 16)
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 59
supported: 59
non-desktop: 0
range: (0, 1)
1920x1200 (0x56) 154.000MHz +HSync -VSync *current +preferred
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 74.04KHz
v: height 1200 start 1203 end 1209 total 1235 clock 59.95Hz
