Bug in hdmi-2.1-chips: av receiver, next gene console and graphics cards affected

Bug in HDMI-2.1 chips: AV receiver, Next-Gen console and graphics cards affected

After the market import of hdmi 2.Had attracted for years, denon, marantz and yamaha presented the first audio / video receiver in recent months with the new version of the audio / video interface – point to import the next-generation consoles xbox series from microsoft and sony’s playstation 5 (ps5) and nvidia’s graphics cards of the rtx-30 series. The new devices give over hdmi 2.1 video in 4k resolution with 120 frames per second (short 4k120) or even in 8k with up to 60 hertz (8k60) with full color resolution and increased contrast circumference (hdr).

As c is reported in the current ie c’t 23/2020, a mutual breakdown of the chip manufacturer panasonic solutions (now supposed by nuvoton technology), however, ensures that according to current state of knowledge translating hdmi-2.1-cape receiver of denon, marantz and yamaha in certain commentators are unable to transfer videos in these ultra-high resolution resolutions to tv free to transfer. The tv screen then remains due to hdmi-2.1-pinch black.

According to research of the c’t, this problem also concerns receiver models, which are currently still in development – which has been allowed to belonged to the avantage models of yamaha, which has already been awaited for a long time. Onkyo / pioneer and sony should also have purchased the addressed hdmi chips at panasonic solutions; but these companies still have no av receivers with hdmi 2.1 on.

Fault image

After there are already problems with hdmi 2 in a previous c’t test.1 in conjunction with a nvidia graphics card rtx 3080 had given a new samsung tv model, c’t looked closer to xbox series x xbox series x in this regard. In fact, it turned out that the car games "dirt 5" on the tv lg cx9 with direct connection easily in 4k120 with hdr ran, when moving over denon’s hdmi-2.1-capable av receiver avr-x2700h, however, this does not lead the ultra-high resolution with increased contrast scope as advertised by the console to the tv. The passage of video images from the preview model of the xbox series x to the tv only succeeded in resolutions, for the no hdmi 2.1 is needed.

According to microsoft’s statement, the pre-series model of the xbox series x already sets the final hardware. The retail version will test c’t but again with regard to the problem.

Similar problems came with a card of type nvidia rtx-3080 – again, a tv device connected via the av receiver did not provide a 4k image with 120 hertz and hdr. With the ps5, the transmission should work according to c’t information; c’t could not check that so far.

Since yamaha uses the same chipset for his devices, it was also possible to affect its equipment. The company had still recruited in a press release that the new av receivers thanks to several hdmi-2.1-input both next-generation consoles can be bleeded at the same time. The new receivers of denon and marantz have only one hdmi-2.1 input.


C’t obtained from several industry insiders the information that panasonic solutions is an error in implementing the hdmi 2.1 enforced transfer variant "fixed rate link" (frl) is undermined that can not be remedied by firmware update. The article in c’t 23/2020 is in detail – as well as well-designed workarounds and the problems consisting of their implementation. The delivery of error-free replacement chips will be expected to be attracted to aging models by mid-next year.