AMDGPU Linux Driver Gets Ready For eDP 1.5 Panels With 6.75 Gbps/Lane

[phoronix]

Phoronix: AMDGPU Linux Driver Gets Ready For eDP 1.5 Panels With 6.75 Gbps/Lane

Sent out today were the latest AMDGPU Display Core "DC" patches having the latest work done by AMD internally on this display/monitor portion of their driver code. Notable with this round of 19 patches is preparation work for upcoming eDP 1.5 laptop displays...

https://www.phoronix.com/news/AMDGPU-eDP-1.5-6.75-Gbps

[microcode]

It'd be interesting to use higher pixel clocks even when they are not strictly necessary. Faster scan is better for a lot of reasons, and my understanding is that the display controllers can sleep during the rest of the vblank.

[Kano]

Everything is done for amdgpu just not for my problems...

https://gitlab.freedesktop.org/drm/amd/-/issues/1077

It is 3 years old! Intel and NVIDIA support Audio via DVI connector. Not even DP to HDMI would work. Intel supports the RGB override via xrandr. And to make it even better:

The kernel option to override EDID via edid.bin file stopped working.

[NM64]

Everything is done for amdgpu just not for my problems...

https://gitlab.freedesktop.org/drm/amd/-/issues/1077

It is 3 years old! Intel and NVIDIA support Audio via DVI connector. Not even DP to HDMI would work. Intel supports the RGB override via xrandr. And to make it even better:

The kernel option to override EDID via edid.bin file stopped working.

Perhaps you could refer to my updated post in the corresponding AVS Forum thread? My go-to trick to solve this issue on AMD GPUs is to output a slightly taller custom resolution e.g.1920x1081 which tends to result in the top row of pixels being cut off when the TV is set to "dot-by-dot", "just scan", or whatever the scaling mode is named that results in no up/downscaling nor overscan being applied.

And, to be clear (heh, pun), this is with HDMI but should in theory work with any video connector.

[darkbasic]

Not even DP to HDMI would work.

Can you please provide a link to such bug report?

[Kano]

Maybe the bug report is not fully clear. My goal is to have got a HDMI connection WITH sound in Full RGB mode. Depending on the connector this happens:

a) HDMI -> TV: Sound working but Y444 video -> changing colors
b) DF -> HDMI -> TV: same as a)
c: DVI -> HDMI -> No Sound but Full RGB

So the maximum I get is a half working connection to my TV. My old solution was to edit the EDID data of the TV and remove the Y444 support. The old kernel option was:

drm.edid_firmware=HDMI-A-1:edid/edid.bin

The file has to be in the initrd. But in later kernels this did not work. Of of the last working kernels is 5.10.46, newer security updates broke this. So today I can use an old kernel or connect Audio via external device or buy a new TV.

[oiaohm]

Maybe the bug report is not fully clear. My goal is to have got a HDMI connection WITH sound in Full RGB mode. Depending on the connector this happens:

a) HDMI -> TV: Sound working but Y444 video -> changing colors
b) DF -> HDMI -> TV: same as a)
c: DVI -> HDMI -> No Sound but Full RGB

So the maximum I get is a half working connection to my TV. My old solution was to edit the EDID data of the TV and remove the Y444 support. The old kernel option was:

drm.edid_firmware=HDMI-A-1:edid/edid.bin

The file has to be in the initrd. But in later kernels this did not work. Of of the last working kernels is 5.10.46, newer security updates broke this. So today I can use an old kernel or connect Audio via external device or buy a new TV.

https://wiki.archlinux.org/title/Kernel_mode_setting#Forcing_modes_and_EDID

cat correct-edid.bin > /sys/kernel/debug/dri/0/HDMI-A-2/edid_override

The debugging interfaces allow changing edid after boot yes this is also a new thing. Now please do check that you HDMI port is still HDMI-A-1 there are a few cards that after particular updates that primary hdmi port is no longer HDMI-A-1.

kano please don't be using a distribution that enables lockdown mode by default.

[Quackdoc]

very promising, eDP is used for a lot now, so it getting fast will be very nice, still looking for an easy way to convert edp to dp and vice versa, I remeber there being a such thing on hackaday, but I couldnt find any additional info