https://bugzilla.kernel.org/show_bug.cgi?id=34212

Summary: radeon: 3650 AGP lockup on radeon.ko load Product: Drivers Version: 2.5 Kernel Version: 2.6.39-rc5 + drm-next 1794d25 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) AssignedTo: drivers_video-dri@kernel-bugs.osdl.org ReportedBy: detringj@gmail.com Regression: No

Hardware: 2x 1.7GHz Xeon (Foster) on a SuperMicro P4DC6 workstation board RadeonHD 3650 AGP (built by VisionTek)

Radeon board has 1x VGA, 1x DVI, and 1x S-Video ports. A TV is attached to the S-Video port through a generic S-Video multiplexer, the others are not connected. TV is a US/NTSC standard definition CRT.

System boots into a VGA text console with no problem. When attempting "modprobe radeon", the system switches to graphics mode, then prints a backtrace on the framebuffer and hangs (no keyboard response, no ping, ssh dies). A mostly-solid stripe of green pixel noise can be seen across the bottom 2 or 3 scanlines of the TV.

The setup works when using the fglrx driver. An NV31+nouveau arrangement also seems to work, so I don't think the motherboard is at fault. This isn't really a "regression" per-se, as it has never worked in any vendor- or self-compiled kernel I've tried (since about July 2010).