ATI Radeon causes trouble with SAMSUNG LED-TV UE40B6000
My graphics adaptor is driving me mad. I had planned to use my Samsung LED-TV (UE40B6000) as a secondary display connected to the DVI port (my 5:4 display is connected to the VGA port). But there are only two modes I can get it to work with: 1280x1024@60Hz and 1280x1024@75Hz. _All_ of the other modes produce a "unsupported video mode" on the TV screen.
Now here's the thing, it works fine under Windows, I can easily set the LED-TV to 1920x1080@60Hz as described in the TV's manual, i.e. just choose the settings under Windows (no extra driver required). So, I thought I might have messed up my Ubuntu system some way. I tried with both Ubuntu 10.04 and openSUSE 11.3 live CDs producing the exact same results - only 1280x1024 produces a picture. I switched modes using the "gnome-display-properties" tools which reports a Samsung Electric Company 7" display offering all the modes it should (incl. 1920x1080@60). As this didn't work I used xrandr to switch with the same results. After that I started fiddling with a /etc/xorg.conf file for the better part of last night with ModeLines and suggestions (gtf ...) from all across the internet, too numerous for me to remember, especially since I basically took whatever came along (not a very structured approach - I know, but I got somewhat desparate). Nothing worked, nothing at all. So at this point I am frustrated and just hope that someone can shed some light on my predicament. What bothers me most that Windows worked out of the box and Linux not at all... lspci: Code:
01:00.0 VGA compatible controller: ATI Technologies Inc R480 [Radeon X800 GTO (PCIE)] Code:
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 160mm x 90mm Code:
(II) RADEON(0): EDID for output DVI-0 |
Have you tried hiding xorg.conf, disconnecting your normal monitor, and seeing what it does then when you start X?
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Yes, I tried that (disconnecting VGA-0 and removing the xorg.conf) because I had suspected that other display on VGA-0 might be the real problem (it's not autodetected). However, I did not get a picture at any time - just changing messages from "no signal" to "unsupported mode". Unfortunately the SAMSUNG LED-TV never really tells what it "thinks" which mode it is receiving. Thus, I am still without a clue.
Oh, you're from Ireland. Cool! Slán leat! P.S. I upgraded my system to Ubuntu 10.10rc earlier today. It didn't change anthing about the issue at hand. I still try to figure out why it would work at a resolution of 1280x1024. It seems like such an unlikely mode. |
I know this sounds odd, but I would read the small docs on this stuff (Radeon Wiki) and post on phoronix where developers hang out. They usually answer no video questions although they seem to ignore much else.
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Delete My account
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The more I think about this issue, the more I assume it must probably be one very specific setting in the xorg.conf that's required. All the ModeLines seem to make so much sense otherwise... But I'm not any closer to a solution.
@business_kid: Thank you for the suggestions. I would love to get in touch with those people actually working on the radeon stuff. Which wiki were you refering to in particular? I just went to phoronics and will try to re-post my message there. @xandercage17: I am afraid there is no HDMI port on the ATI Radeon X800 series. Why would the quality of a DVI-D be poorer? |
http://phoronix.com/forums/
There's an amd/ati open source forum. There's at least one amd guy and at least one X guy drops in there. |
It's a bit sad to see this thread getting spammed. :-(
Anyway, I contacted the guys on Phoronics, but so far nobody's offered a solution. So I am still hoping... |
Delete My account
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@xandercage17: Thank you for your suggestion. That is the driver I've been using. I also tried the proprietary fglrx driver from ATI. Both didn't achieve any different results.
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Delete My account
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@xandercage17: Thank you so much for your ideas and help. However, when it comes to the drivers, I already tried ati/radeon (same thing) as well as fglrx (i.e. the one from the AMD site). Other drivers are not compatible with this specific ATI graphics adaptor at all. As for the cable, I have been using the HDMI port of the TV right from the start connected via a DVI to HDMI cable which works fine for the 1280x1024 mode only under Liunx and all other modes under Windows. So, it is definitely not the cable connection that is the problem.
I filed a bug report at freedesktop.org hoping someone will catch it. https://bugs.freedesktop.org/show_bug.cgi?id=30927 In the meantime, all suggestions are still very welcome! :-) |
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