[openchrome-users] Problem with brightness and xrandr

[RBZ]

Hi, I have a Biostar P4M900-M7 FE 7.0 motherboard with a VIA P4M900 [Chrome 9 HC] chip. I use Debian 11 and I have installed the "xserver-xorg-video-openchrome 0.6.0-4" package, which is the latest version of the driver found in the Debian repositories.

This driver works perfectly but, when I want to lower or raise the brightness with the command "xrandr --output VGA-1 --brightness <value>", absolutely nothing happens, no error message or anything, the brightness is not change. The strangest thing is that if I install an old version of the driver, like "0.5.0-3", the command works perfectly and I can change the brightness without problems.

Why does the driver only change the brightness with version 5 and not with version 6? both versions work perfectly, except that in version 6 I can't change the brightness (and no error message is shown to tell me where the problem could be). Is there any parameter that I can change in version 6 to solve it? perhaps modifying the xorg.conf file? are there other ways to change in brightness without using xrandr? Thanks in advance.

Here I leave the output of the "inxi -Gxx" command:

Graphics:
  Device-1: VIA CN896/VN896/P4M900 [Chrome 9 HC]
  vendor: Biostar Microtech Intl Corp driver: N/A bus ID: 01:00.0
  chip ID: 1106:3371
  Display: server: X.Org 1.19.2 driver: loaded: openchrome
  unloaded: fbdev,modesetting,vesa resolution: 1280x720~60Hz s-dpi: 96
  OpenGL: renderer: llvmpipe (LLVM 11.0.1 128 bits) v: 4.5 Mesa 20.3.5
  compat-v: 3.1 direct render: Yes
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