Bug 15542

Summary:

780G detects incorrect resolution

Product:

xorg

Reporter:

Joel <joel.stan>

Component:

Driver/Radeon

Assignee:

xf86-video-ati maintainers <xorg-driver-ati>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

normal

Priority:

medium

Version:

7.3 (2007.09)

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
xrandr-intel-vga	none
xrandr radon with vga and hdmi attached	none
possible fix	none

Description Joel 2008-04-16 19:05:43 UTC

780G board, connected to a LCD tv over HDMI.

Output resolution is wrong, causing about 23 pixels to be chopped off the top and bottom (can see one line of pixels from the gnome panels), and an amount from each side of the display.

It wasn't obvious how to attach multiple files here, so logs and xorg.conf are at http://dev.laptop.org/~joel/xorg-logs/

driver is git, commit f72a4b80.

Comment 1 Alex Deucher 2008-04-16 22:31:02 UTC

This may be an issue with the scaler in your tv.  It sounds like the tv is compensating for the overscan in TV signals.  See if your tv has an option to turn that off.

Comment 2 Joel 2008-04-19 23:10:38 UTC

Created attachment 16049 [details]
xrandr-intel-vga

Comment 3 Joel 2008-04-19 23:12:12 UTC

Created attachment 16050 [details] [review]
xrandr radon with vga and hdmi attached

Comment 4 Joel 2008-04-19 23:14:30 UTC

I looked around for an option to disable scaling, but couldn't find one. There was a "zoom" option, which let me tilt and strech the image vertically.

I'm not convinced that scaling is the issue though, or perhaps I'm having a separate problem.

I tried plugging the 780G into the TV with VGA, as I can compare the results there to my laptop, an intel 945GM (which doesn't have a digital out, hence VGA). The 780G couldn't display anything over the VGA (using `xrandr --output VGA-0 --auto`).

I have attached the outputs of `xrandr --verbose` for the 780G and the intel 945GM on my laptop with the TV attached via VGA.

Is it noteworthy that the intel driver reports 1360x768, while radeon does not? 

What is the "None" output on about? I thought this was referring to the DVI output, but it appears to be related to VGA?

Comment 5 Alex Deucher 2008-04-20 17:02:06 UTC

Created attachment 16069 [details] [review]
possible fix

Please try this patch.  I think the currently unsupported SCART connector may be causing an issue.  Also, when you are testing the TV, please use only the VGA or HDMI, not both at the same time.

Comment 6 Alex Deucher 2009-06-11 09:50:29 UTC

This has been fixed for a while.

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