[Bug 94877] New: Radeon 7500: GPU lockup after starting Xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94877

            Bug ID: 94877
           Summary: Radeon 7500: GPU lockup after starting Xorg
           Product: xorg
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: macro at hotmail.com
        QA Contact: xorg-team at lists.x.org

After starting Xorg, interaction with the gui quickly causes the GPU to lock up
with "ring 0 stalled for more than 10000msec" kernel messages.

Almost any GUI interaction triggers the lockup.  It's just a question of how
long it takes, with interaction involving "more painting" triggering it faster.

The lockup does not occur as long as there is no gui interaction.  Just moving
the mouse around does not trigger it.

This of course makes Xorg unusable on this system.

The Linux+Xorg stack did work reliably on this machine until early 2010, with
reasonable 2D and 3D performance (for the hardware).  I did not use it between
then and 2015, when I reinstalled an up-to-date version of Linux and Xorg
stopped working.

The machine is, from uname -a, Gentoo "Linux 4.5.0-gentoo-r1" running on a "ppc
7400, altivec supported PowerMac5,1".

The video card is, from Xorg.0.log, an "ATI Radeon 7500 QW (AGP/PCI) (ChipID =
0x5157)".

Dmesg and Xorg.0.log attached.

Following are a few detailed examples of interactions triggering the lockup,
with the resulting kernel error messages.

I am happy to follow instructions to provide more information.  I can probably
also arrange SSH access to the machine.

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