Hi, I've found following problem on my new pc: onboard gfx x4500 has two digital connectors: hdmi and dvi-d, running them both same time makes glitches on both screens - specially on dvi-d, but they are also visible on hdmi screen, too. Glitches are pixels which are intensive blinking, on dvi-d screen there are plenty of them, unusable to work with it at all, but there are some 'weird' pixels on hdmi display too (about 20 in volume). Interesting is when resolution is low (ubuntu splash screen) 'weird' pixels seems to tend cylindrical and are mirrored on both sides), in native resolution there isn't such a princpile, they just happens. I've found that making X running in 16 bit color depth resolves issue - but not finally, there are some pixels issues similar to previous one - pixels sometimes are wrongly rendered - this time it happens only with dvi-d output. Regardless of color depth there is some screen flickering effect only on dvd-i output - it happens periodically (one time for ten minute maybe, not in recurrent and reproducible way - I wasn't able to catch it on pictures). g31 x86_64 X.Org X Server 1.6.4 compiled for 1.6.4, module version = 2.9.0 Module class: X.Org Video Driver ABI class: X.Org Video Driver, version 5.0 2.6.31-16-generic Ubuntu 9.10 64bit pc computer, mainboard gigabyte GA-EG41MFT-US2H HDMI and DVI-D dualhead configuration easy to reproduce - with default configuration
I've figured out that with 24bpp it happens with hdmi too - even if dvi-d is disconnected. I really don't know that it is. I've compiled and used latest intel driver but it'd doesnt help at all with the issue. Could it be some hardware problem? - pc is brand new. Sometimes if overlapped with some windows, for examples terminal one - the pixels behave normally. Problem is visible on serveral displays (lcd, projector) - there is no problem with d-sub.
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Could you attach X log? Have you tried more recent kernel if you're using KMS already?
That looks very atypical of a driver bug... There is a slim chance that this is a modesetting issue and so changing modes, bpp and dithering might correct the issue.
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