[Bug 20478] New: [x1100] flickering after resume from ram

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20478

           Summary: [x1100] flickering after resume from ram
           Product: xorg
           Version: 7.3
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at canonical.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=23555)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23555)
Xorg.0.log

Forwarding this bug from a Ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/318325

[Problem]
After resuming from RAM, the screen flickers when the CPU load drops to a low
level.

[Original Report]
System : Ubuntu 8.10 (up to date)
GPU : ATI express X1100
Video driver : radeon

Steps to reproduce :
- put the computer on standby
- resume from ram
=> the screen will flicker while CPU activity is not high

workaround :
- just launch an infinite loop that consume CPU : $ while true; do echo
>/dev/null; done
=> the screen won't flicker while the CPU is use (even if only one core is
being used)

There isn't error either in Xorg, xsession logs or in dmesg after resuming.

Notice that this trouble doesn't occur with fglrx driver.

[lspci]
00:00.0 0600: 1002:5950 (rev 10)
        Subsystem: 1025:009f
01:05.0 0300: 1002:5975
        Subsystem: 1025:009f


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