AMDGPU Linux Driver Preparing To Better Support Modern HDR/OLED Displays

[phoronix]

Phoronix: AMDGPU Linux Driver Preparing To Better Support Modern HDR/OLED Displays

It looks like with the Linux 5.7 kernel cycle this spring there should be proper backlight support when using this AMD Radeon kernel graphics driver with modern HDR/OLED displays...

http://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-OLED-Display-Backlight

[Trevelyan]

What about supporting more than 2 audio channels out the HDMI port? I’d love to get 6 for 5.1 surround sound.

[tildearrow]

Controlling the "backlight' on an OLED display?

(hint: OLED displays aren't backlit)

[agd5f]

What about supporting more than 2 audio channels out the HDMI port? I’d love to get 6 for 5.1 surround sound.

That has been supported for years.

[Jedibeeftrix]

Is this jyst for displayport, or will it work on hdmi too?

[Danny3]

And still no control panel for human beings for fuck's sake.
How do I turn this on or see its status?
Still with som cryptic commands?

[microcode]

Display brightness/gain control over DisplayPort is a welcome trend.

[microcode]

And still no control panel for human beings for fuck's sake.
How do I turn this on or see its status?
Still with som cryptic commands?

Well, if you talk to people like this, you can guess how helpful they'll want to be.

[CochainComplex]

Well, if you talk to people like this, you can guess how helpful they'll want to be.

maybe one of the CoC opponents ...let him be "grumpy torvalds" in his microcosmos

[Trevelyan]

That has been supported for years.

I have:-

• Linux 5.4.8 (Debian Buster with backports enabled)
• AMD Ryzen 3 PRO 2200GE w/ Radeon Vega Graphics
• VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] (rev d7)
  • Device: AMD RAVEN (DRM 3.35.0, 5.4.0-0.bpo.2-amd64, LLVM 7.0.1) (0x15dd)
  • Version: 18.3.6
• Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller

The HDMI port goes into a 5.1 Audio extractor that connect to my surround-sound system via toslink (since toslink have become rare) and via hdmi to my TV.

I can only get front left and front right out of it. or DTS/AC3 pass-through (which encoded 6 channels on two), I have never got 6 channel (plain) going.

On a kernel before 5.4 its pretty much unbootable. Currently I have amdgpu.noretry=0 set, which gets past kernel graphics init (just after grub) about 1 in 5 boot attempts. But once booted amdgpu streams non-stop errors in dmesg (CPU: 1 PID: 820 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:1954 write_i2c_default_retimer_setting+0x220/0x350 [amdgpu]).
Even without that kernel boot parameter its even less stable/usable. Mostly graphics would constantly freeze, until some watchdog does a gfx soft restart, also logged to dmesg.

My hope is things (wrt gfx) will be better once 5.5 gets into buster-backports. However I have no idea how to get reliable surround-sound.