i know the summary sounds weird and stupid but i came to the conclusion that the problem is due to the xorg radeon driver : under m$ windows it's ok, with the ATI fglrx driver (under xorg 6.7.0) no problem if i swap the screens (same models, same settings) on the video card connectors the other screen becomes much brighter and the first returns to normal state. I tried changing screen settings but i couldn't get correct results, i tried xgamma no more results. Really i'm lost.
I've experienced this problem on 2 different computers (9700pro and 9600m), on both it seems that the primary VGA output is brighter than the secondary, this causes light colours to display as white on LCD monitors (output clamping), CRTs seem to handle it better, but still display artifacts near areas of high brightness. This problem only occurs when using the Radeon driver - the ATI driver works fine in this regard, as does Windows.
I believe this is a bug with 9000 and 9200 series radeon's and X.org. I am experiencing this with a radeon 9000 using ati-drivers-8.19.10 and xorg-x11-6.8.2-r4, kernel 2.6.14-gentoo-r2. the screen is extremely bright and washed out, and is unreadable unless gamma is set to 0.3 or lower (still washed out but black on white text is readable). The display attached to the TV out appears to be unaffected. I have found that disabling HWcursor and forcing SWcursor resolves the issue, but now there are cursor artifacts whenever I move the mouse. This also doesn't occur if the computer is turned on with the second display off, which isn't a solution either as it leaves the second display unuseable. Try adding this under Section "Device": Option "SWcursor" "on" Option "HWcursor" "off"
Created attachment 3920 [details] my X.org config file for anyone interested here is the x.org config I am using. this behavior occurs when I use dual head, single head, or mirrored TV out.
Does this still happen with current xf86-video-ati CVS (HEAD or ati-1-0-branch)?
Ping to the bugsubmitter!
pong from the bug submitter FYI: in the meantime i changed my graphic card so i cannot test any change
Closing this bug as there is no hardware to reproduce this problem with,
Just tested this using xorg-7.0 on an ATI 9700pro, it seems that this problem no longer occurs :)
This bug still exists in X.Org 7.2 (on Kubuntu 7.04) with a Radeon 9500 Pro! I'm using a dual screen setup. The primary display is very bright, exactly as described in the first comment.
Bug #1082 seems to be related to this one
*** This bug has been marked as a duplicate of bug 1082 ***
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