Bug 17682

Created attachment 19042 [details]
xorg.conf

Created attachment 19043 [details]
Screenshot of the "moire" pattern in the 1920x1080 mode

This also shows the default xterm created by xinit. The upper left corner of it is cut off, i.e. it is not completely visible.

(In reply to comment #0)
> Created an attachment (id=19041) [details]
> 
> I tried with the latest git master (38aa450fc) and X Server 1.5.0 on Fedora 9.

Sorry that's d100a6a of course...

Funny. In my case 1920x1080 is displayed exactly as 1920x1080 on Sony LCD and it is scaled to something like 1850x1000 (guessing) in case of Samsung LCD. The case with Samsung results in black borders.
When playing with registers (rhd_dump) I found portion of "rhd_dump -w" commands that caused this scaling. Would it be interesting for you developers to provide theses registers?

Thanks for the hint, that's exactly how it looks like. It probably also explains the "moire" pattern in 1920x1080.

I've updated the bug summary accordingly.

One explanation could be that the driver doesn't touch the R700 scaler registers at all and therefore the values set up by the BIOS are still active. The 80x25 VGA display (BIOS, Linux VT) is up-scaled to 1920x1080@60 (16:9) and fits exactly to the display. When X switches to the graphics mode the output will then be up-scaled too :-/

Can you please share what registers you found that control the R700 scaler? Did you find out how to disable it?

I probably also need to check the code in the driver that produces this output in the X log:

(II) RADEON(0): ParseTable said: CD_SUCCESS
(II) RADEON(0): Call to AtomBIOS Exec succeeded
scaler 0 setup success

Checked the code in atombios_output_scaler_setup() and the full log output is

Not using RMX
(II) RADEON(0): ParseTable said: CD_SUCCESS
(II) RADEON(0): Call to AtomBIOS Exec succeeded
scaler 0 setup success

    if (radeon_output->Flags & RADEON_USE_RMX) {
...
    } else {
	ErrorF("Not using RMX\n");
	disp_data.ucEnable = ATOM_SCALER_DISABLE;
    }

So the driver obviously tries to disable the scaler for CRTC 0 and thinks it succeeded.

I'll have access to HDMI LCD after few days, will check these registers then.

This is an issue with your TV.  A lot of TV's have settings to display the native image or to scale/clip the edges thinking it's overscan area as per older analog TV's.  My TV does the exact same thing (edges clipped) with the image coming from the cable box or the computer (either via VGA or component, etc.).

(In reply to comment #8)
> This is an issue with your TV.  A lot of TV's have settings to display the

Dooohh, boy do I feel stupid now. After reading this I took the remote control and played around with the picture size option. As it turned out the default "16:9" is different from the "Just Scan" setting.

Now the HDMI signal is displayed 1:1 and the moire pattern is gone. I'm still missing roughly 60x30 pixels from the border, but that seems to be a physical limitation of the TV (I guess to hide edge effects of the DLP chip).

Now only XVideo is missing :-)