[Bug 94414] New: Radeon RV370 w/ acceleration enabled exhibits problem with resolutions above 1440x900

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94414

            Bug ID: 94414
           Summary: Radeon RV370 w/ acceleration enabled exhibits problem
                    with resolutions above 1440x900
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: gawix at yahoo.com
        QA Contact: xorg-team at lists.x.org

Observed under Using Fedora 23 package
xorg-x11-drv-ati-7.6.1-3.20160215gitd41fccc.fc23.i686 but problem is present in
many other Linux distribs.

xorg.conf

Section "Device"
  Identifier "device"
  Driver "radeon"
  Option "Accel"  "true" 
EndSection

lspci -v

...
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV370
[Radeon X300] (prog-if 00 [VGA controller])
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 0602
    Flags: bus master, fast devsel, latency 0, IRQ 30
    Memory at ec000000 (64-bit, prefetchable) [size=32M]
    Memory at efde0000 (64-bit, non-prefetchable) [size=64K]
    I/O ports at dc00 [size=256]
    Expansion ROM at efe00000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: radeon
    Kernel modules: radeon
...

Was working ok with old fedora XOrg version (under Fedora 12, it was OK).

I'd like to provide more useful info as whether the bug is in the DRI layer or
XOrg driver but I don't know where to start.

I've tried modifying every EXA options without success. The only stable
configuration is with Accel = false.

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