https://bugs.freedesktop.org/show_bug.cgi?id=29894

Summary: KMS regression in 2.6.35: Flicker and half-rendered scenes in SDL games with Radeon RV770 Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: marti@juffo.org

I am getting severe flickering in multiple SDL-based games with Radeon HD 4870 (RV770)

Games tested that have this problem: * World of Goo (SDL, 32-bit) * Frets on Fire (Python, SDL, true 3D, 64-bit) * Aquaria (SDL, 32-bit)

---- * kernels 2.6.33.4 and 2.6.34.2 are good even with KMS enabled * kernels 2.6.35.4 with KMS disabled is good * kernels 2.6.35 and 2.6.35.4 with KMS enabled is bad

The problem manifests itself in substantial flickering; most frames seem to render OK, but a couple of times every second there's an incomplete frame. The incomplete frame looks like a half-rendered scene, with some objects missing.

Using xorg-server 1.9.0, mesa 7.8.2, xf86-video-ati-6.13.1 (also tried mesa from git)

Normally I have 2 screens attached, but this time I also tried disabling the second screen and unplugged it entirely.

lspci: 01:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4870]

glxinfo: OpenGL renderer string: Mesa DRI R600 (RV770 9440) 20090101 TCL DRI2 OpenGL version string: 2.0 Mesa 7.8.2