Graphics Cards

[wonderboy8]

So I have a 1280x400 display. Worked perfectly on Nvidia 3060 and 1050 mobile. I cannot get it to line up at all correctly on my $1100 6900xt.... I have a custom resolution set in Radeon driver. CVT reduced blanking is the closest setting. It is about half an inch to the right and up. Really wish that I could just plug in a screen and that it would work properly. 

[cpurpe91]

Does that screen have it's own scaling or are you using GPU scaling? 

[wonderboy8]

there's no scaling applied anywhere i believe. The screen does not have an OSD of any sort. GPU scaling settings don't fix it either

[PhysicsDude]

Can confirm an identical issue is also present on my 6700 XT. Generic PnP driver is used, but neither Windows nor Adrenalin sees the display or lets me set a custom/appropriate resolution. 

According to the 1280x400 LCD's docs (which are tailored for the Raspberry Pi) the HDMI timings appear to be:

hdmi_timings=
<h_active_pixels> 1280
<h_sync_polarity> 0
<h_front_porch> 64
<h_sync_pulse> 2
<h_back_porch> 18
<v_active_lines> 400
<v_sync_polarity> 0
<v_front_porch> 10
<v_sync_pulse> 3
<v_back_porch> 42
<v_sync_offset_a> 0
<v_sync_offset_b> 0
<pixel_rep> 0
<frame_rate> 60
<interlaced> 0
<pixel_freq> 37330000
<aspect_ratio> 3