Bug 25812 - problem with dual-head dvi-d and hdmi
Summary: problem with dual-head dvi-d and hdmi
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Wang Zhenyu
QA Contact: Xorg Project Team
Depends on:
Reported: 2009-12-28 10:51 UTC by lb
Modified: 2010-07-17 07:56 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

pic1 (83.25 KB, image/jpeg)
2009-12-30 02:58 UTC, lb
no flags Details
pic2 (97.12 KB, image/jpeg)
2009-12-30 02:59 UTC, lb
no flags Details
pic3 (87.25 KB, image/jpeg)
2009-12-30 02:59 UTC, lb
no flags Details

Description lb 2009-12-28 10:51:46 UTC
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).

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
Ubuntu 9.10 64bit
pc computer, mainboard gigabyte GA-EG41MFT-US2H
HDMI and DVI-D dualhead configuration
easy to reproduce - with default configuration
Comment 1 lb 2009-12-30 02:58:24 UTC
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.
Comment 2 lb 2009-12-30 02:58:55 UTC
Created attachment 32371 [details]
Comment 3 lb 2009-12-30 02:59:09 UTC
Created attachment 32372 [details]
Comment 4 lb 2009-12-30 02:59:23 UTC
Created attachment 32373 [details]
Comment 5 Wang Zhenyu 2010-02-21 21:10:53 UTC
Could you attach X log? Have you tried more recent kernel if you're using KMS already?
Comment 6 Chris Wilson 2010-07-17 07:56:31 UTC
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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