Bug 21966 - [G45 KMS DVI] display goes black intermittently
Summary: [G45 KMS DVI] display goes black intermittently
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Jesse Barnes
QA Contact: Xorg Project Team
Keywords: NEEDINFO
Depends on: 20644
  Show dependency treegraph
Reported: 2009-05-27 07:16 UTC by matej.tyc
Modified: 2009-06-24 05:25 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

output of dmesg (30.89 KB, text/plain)
2009-06-01 02:10 UTC, matej.tyc
no flags Details
Xorg.0.log (18.91 KB, text/plain)
2009-06-01 02:11 UTC, matej.tyc
no flags Details
set FIFO watermarks at DPMS & mode set time (19.45 KB, patch)
2009-06-23 18:27 UTC, Jesse Barnes
no flags Details | Splinter Review

Description matej.tyc 2009-05-27 07:16:31 UTC
Hello, I have a similar problem that is described here: http://bugs.freedesktop.org/show_bug.cgi?id=17805
From time to time, the display goes black for a short while. It is not predictable and occurs roughly once per 5 minutes.
I have Asus p5q-vm with G45 chipset with a monitor connected via DVI.
KMS not OK with the kernel and xf86-video-intel 2.7.1
It was quite OK regarding this issue with the kernel though.
Disabling KMS makes things working again.
How can I help to solve this problem?
Comment 1 Gordon Jin 2009-05-29 05:28:14 UTC
http://intellinuxgraphics.org/how_to_report_bug.html asks you to provide Xorg.0.log and dmesg output.
Comment 2 matej.tyc 2009-06-01 02:10:00 UTC
Sorry for the incomplete bugreport. Here are the required specs:
Software versions:
libdrm 2.4.11, xorg-server, xf86-video-intel 2.7.1, kernel Distribution: Up-to-date Archlinux
The rest is in the first post.
Comment 3 matej.tyc 2009-06-01 02:10:29 UTC
Created attachment 26333 [details]
output of dmesg
Comment 4 matej.tyc 2009-06-01 02:11:02 UTC
Created attachment 26334 [details]
Comment 5 matej.tyc 2009-06-14 05:54:25 UTC
I think that the bug 20644 is absolutelly unrelated to this issue. Might it be some sort of a typo?
Comment 6 Jesse Barnes 2009-06-23 18:27:21 UTC
Created attachment 27067 [details] [review]
set FIFO watermarks at DPMS & mode set time

Here's a KMS patch to set the FIFO regs.  Might help with screen blanking, please give it a try.
Comment 7 matej.tyc 2009-06-24 05:25:50 UTC
I have updated to the 2.6.30 kernel that made it into my distro today nad this issue seems to be resolved since the upgrade. 
So I even haven't tried your patch...

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