On the TV the HDMI-CEC setting (Anynet+ in the case of Samsung) must be set to ON as well as setting the TV's audio to "external speakers" or "home theater". On the AVR, the HDMI Control setting must be set to ON as well. Once done,...
The low end Denon and Marantz models that meet your requirements in that price range would be the Denon E300 and last year's Marantz 1603 may be inside your budget as it's on clearance having been replaced by the 1604.
Although this feature is on some older Denon and Marantz mid level and higher models up until 2 years ago as noted in a previous post, it was removed from last year's models, and now returns in the new Denon X3000 and X4000 as well as...
Did anything change in your current configuration? Does it occur with all inputs? First try a "soft reset" by unplugging the unit for 10 minutes. If still no joy, then reset the microprocessor (p. 149 OM).
Also note there is a...
You can set the "i/p Scaler" for each source so for those you simply want to pass through select the source and then set it to "OFF" and for those you want to upscale, select the source and set to the appropriate setting based on the...