Join Log in
Score:0
paganiniana avatar Ubuntu

Change hardware backlight brightness with Radeon card

us flag
paganiniana

I am trying to change the backlight brightness of my monitors from the command line on Ubuntu 20.04.3 LTS.

My monitors are Dell Ultrasharp (1x U2719D and 2x U2419H connected in series via display port) and they are driven by a Radeon RX550. I have read that many solutions do not work well with Radeon cards but I wondered if anyone had any suggestions none the less?

I have attempted using xbacklight which has no effect when commands are run and light, which returns: No backlight controller was found, so we could not decide an automatic target. Running light -G returns only keyboard lights and nothing that looks related to my displays.

sudo lshw -c video returns this:

  *-display                 
       description: VGA compatible controller
       product: Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:09:00.0
       version: c7
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=amdgpu latency=0
       resources: irq:93 memory:e0000000-efffffff memory:f0000000-f01fffff ioport:e000(size=256) memory:fce00000-fce3ffff memory:c0000-dffff

I can use xrandr with little issue but would rather adjust the hardware brightness if possible! Please let me know if any other information would be useful.

Many thanks for any suggestions.

25
0 + 0
Nmath avatar
ng flag
Nmath
Backlight brightness is not standardized. You need to adjust the monitors themselves.
1
Reply
ธงชาติไทย
Elon Musk
I sit in a Tesla and translated this thread with Ai:

mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.