HD 5770 on Receiver: Wrong resolution


New member

I recently bought a ATi HD 5770, which at first I connected to my Dell Display via HDMI. The display is 16:10 with a 1920x1200 resolution. Everything worked just fine and as expected.

I then got a new AV receiver, the Yamaha RX-V465, which supports HDMI passthrough. So now the HD5770 connects to the receiver, and the receiver to the Dell display. The problem now is: The catalyst driver reports the display resolution as 1080p, which is incorrect and looks awful.

Is there a way to trick the driver into using the correct resolution, or am I out of luck since it's the receivers fault?
why do you need the receiver, for sound?

i'm gonna lean towards it being at fault, since the tv hdmi standard is only 1920x1080

check its manual though...

i got a wacky idea, what if you connect hdmi to the receiver, but just use that for audio (if that's what you were wanting), then clone the windows display & use the 2nd dvi port for the monitor
Yes, the receiver is for sound. When playing Blu-Ray discs, DTS-HD and TrueHD are only transported via HDMI, since SPDIF doesn't have the bandwidth.

Your proposal is actually my current setup, and it does work. It also means, however that there's an "invisible" extended display on the right sight of my monitor, and once in a while an application decides to open a dialog there, which is frustrating. I'd rather use HDMI only.

The Catalyst driver must somehow get information from the receiver/display what resolutions are supported (is that done via EDID?). I was just wondering if it's possible to trick it into using the higher resolution.

When I connect the ATI card directly to my Dell monitor via HDMI, it chooses the correct resolution of 1920x1200, so it does work. Just not when going 'detour' via the receiver.
well i'm wondering if the receiver is designed to always scale/report 1080p, or even if it was getting a larger resolution input, it might always output 1080p so it wont mess up anyone's tv

blurays are 1080p anyway, so... if you dont watch them too often, & there's no way to pass 1920x1200 through, i would just use dvi for normal use, then set to 1080p in windows, unplug dvi, plug hdmi into the card, other end in receiver (the receiver-monitor is always connected, you just flip monitor input now), & watch a movie

on a related note, get a ps3 for bluray, have multiple cables going into the monitor (i've got an old not used comp over vga, this comp over dvi, ps3 over hdmi) :D:rolleyes:;):lol:
My receiver doesn't have any video scaling capabilities, it supposedly passes the video signal through as-is.

The problem is that the image looks really awful at 1080p, I have no idea how the display actually handles it.
In Catalyst set to 1920x1080p, disable scaling and overscan/underscan and on the Dell display disable scaling. Then the picture should remain unmolested and centered rather than stretched.

Perhaps if the display has both HDMI and DVI then the active input could be switched via buttons (and some minor software fiddling) rather than swapping cables.

In the end it prolly comes down to either settling for short screen or lo-def audio else a dual display configuration.
I checked the manual of the receiver and am puzzled. Even though it does not have support for any video scaling whatsoever, there is a list of supported resolutions in the manual, 1920x1080p being the largest.

Auric, I did what you said and I can make use of the whole display this way, but the image still looks awful. Wrong colors, washed out, unsharp. It's intolerable.

I guess the method kn00tcn described works just fine, I just gotta remember that there's a 2nd, invisible, display on the right-hand side :)
If the whole display area is filled then scaling is still active somewhere which is why it looks awful.

A tweak for kn00tcn's method would be to configure the extended positioning of the second display to above the first so that the mouse pointer is still contained by the sides and bottom.