Mailinglist Archive: radeonhd (311 mails)

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[radeonhd] [Bug 14722] New: dual monitor flicker and loss of signal
  • From: bugzilla-daemon@xxxxxxxxxxxxxxx
  • Date: Thu, 28 Feb 2008 13:51:04 -0800 (PST)
  • Message-id: <bug-14722-248@xxxxxxxxxxxxxxxxxxxxxxxxx/>

Summary: dual monitor flicker and loss of signal
Product: xorg
Version: 7.3
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/radeonhd
AssignedTo: lverhaegen@xxxxxxx
ReportedBy: dhalik@xxxxxxxxxxxxxxx
QAContact: xorg-team@xxxxxxxxxxx

We've recently upgraded all the workstations in my department to nice new HP
machines with X1600XT PCIe cards (RV530 chipset I think), dual 24" HP LP2465
monitors, and Fedora 8. So far they've worked great with the RadeonHD 1.1
drivers, until we went to an extended desktop and started using them full time.
On all of our machines the right display (i.e. second display) has a weird
flicker problem. Every few minutes horizontal black lines will randomly flash
quickly across the screen, and maybe once an hour the screen completely looses
its signal for about a second and then comes back on.

I've ruled out the monitors or the videocard/workstation at this point. Also,
the fact that it happens on all the machines leads me to believe its a driver
issue not faulty hardware. Using the same monitors and RadeonHD release on my
X1650 AGP in an older workstation never exhibited the problem once. I'm
guessing it's this particular chipset or maybe the fact that it's dual DVI out.
The AGP card without the problem is VGA/DVI.

The issue is always in the secondary port. From xrandr:

DVI-I_2/digital connected 1920x1200+1920+0 519mm x 324mm
1920x1200 60.0*+

I've been looking at Bug #13853 and it seems similar, but I'm not experiencing
the permanent loss of signal, it always returns immediately. Also, I'm using
xorg-x11-drv-radeonhd-1.1.0-0.6.20080216git.fc8 which is supposedly built after
the fixes in #13853 were applied, so it must be a separate or related issue.

Please let me know if there is any testing I can do, I'd love to help.

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