Radeon 7500: GPU lockup after starting Xorg
Submitted by mac..@..il.com
Assigned to xf86-video-ati maintainers
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.