GMA 3150 hdmi output limited to 1280x720 while VGA does 1920x1080?

[idata]

Hello,

we've bought 3 zotac boards with atom D525 which has integrated gma 3150 graphics card.

# > lspci

00:02.0 VGA compatible controller: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller (rev 02)

00:02.1 Display controller: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller (rev 02)

# > uname -a

Linux hwc1 3.5.7-gentoo # 3 SMP Mon Feb 11 10:49:35 CET 2013 i686 Intel(R) Atom(TM) CPU D525 @ 1.80GHz GenuineIntel GNU/Linux

starting Xorg with screen on HDMI port yields something we don't understand:

# > xrandr

Screen 0: minimum 320 x 200, current 1280 x 720, maximum 32767 x 32767

LVDS1 connected 1280x720+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

1280x720 60.0*+

800x600 60.3 56.2

640x480 59.9

VGA1 disconnected (normal left inverted right x axis y axis)

wtfl? 1280x720 is highest resolution on HDMI??? VGA does 1920x1080 fine. I don't understand... is this a hardware limitation or can this be fixed somehow in the driver or wherever?

same on windows 7, btw.

[powerarmour · Accepted solution]

slf software GmbH wrote:

wtfl? 1280x720 is highest resolution on HDMI??? VGA does 1920x1080 fine. I don't understand... is this a hardware limitation or can this be fixed somehow in the driver or wherever?

I'm sure it's a hardware limitation unfortunately, the GMA 3150 only originally supported analog <1200p VGA outputs, and only a single LVDS channel. Some manufacturers like Zotac added in a separate digital HDMI controller to tap into this LVDS, but I'm afraid 1366x768 or 1280x720 is as high as it'll ever go.

[idata]

thanks, powerarmour for your answer.

I talked to xorg driver devs on irc and they confirm this: intel crippled the 3150, it has no native HDMI output. Zotac put a LVDS to HDMI bridge to "fix" this. Either the bridge can't do >1280x720 or the LVDS on the intel card can't do more. Either way: we're stuck the VGA. Damn.