https://bugs.freedesktop.org/show_bug.cgi?id=29444

Summary: OpenGL stopped working after kernel upgrade to 2.6.35 Product: DRI Version: unspecified Platform: x86 (IA32) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: simon@munton.demon.co.uk

After upgrading to kernel 2.6.35, I found that when using hugin, the fast OpenGL based panorama preview stopped working, and the program just froze. Same thing happens with glxgears - no gears displayed, and froze.

Backtrace from glxgears: #0 0xb75606e6 in poll () from /lib/libc.so.6 #1 0xb74512eb in ?? () from /usr/lib/libxcb.so.1 #2 0xb7453955 in xcb_wait_for_reply () from /usr/lib/libxcb.so.1 #3 0xb764a078 in _XReply () from /usr/lib/libX11.so.6 #4 0xb7789cef in ?? () from /usr/lib/libGL.so.1 #5 0xb77891b8 in ?? () from /usr/lib/libGL.so.1 #6 0xb77602fd in glXSwapBuffers () from /usr/lib/libGL.so.1 #7 0x0804a548 in ?? () #8 0xb74a1b86 in __libc_start_main () from /lib/libc.so.6 #9 0x080490f1 in ?? ()

Backtrace from hugin: #0 0xb601d71c in poll () from /lib/libc.so.6 #1 0xb56e32eb in ?? () from /usr/lib/libxcb.so.1 #2 0xb56e5955 in xcb_wait_for_reply () from /usr/lib/libxcb.so.1 #3 0xb62a0078 in _XReply () from /usr/lib/libX11.so.6 #4 0xb63da08b in ?? () from /usr/lib/libGL.so.1 #5 0xb63d899f in ?? () from /usr/lib/libGL.so.1 #6 0xa0ca9ce7 in ?? () from /usr/lib/xorg/modules/dri/r300_dri.so #7 0xa0caa5b0 in ?? () from /usr/lib/xorg/modules/dri/r300_dri.so #8 0xa0c88b22 in ?? () from /usr/lib/xorg/modules/dri/r300_dri.so #9 0xb63d8304 in ?? () from /usr/lib/libGL.so.1 #10 0xb63b0eac in glXMakeCurrentReadSGI () from /usr/lib/libGL.so.1 #11 0xb6495367 in wxGLContext::SetCurrent(wxGLCanvas const&) const () from /usr/lib/libwx_gtk2u_gl-2.8.so.0 #12 0x0815f016 in GLViewer::SetUpContext (this=0x883ab90) at /home/simon/build/hugin-2010.0.0/src/hugin1/hugin/GLViewer.cpp:105 #13 0x0815f3e0 in GLViewer::RedrawE (this=0x883ab90, e=...) at /home/simon/build/hugin-2010.0.0/src/hugin1/hugin/GLViewer.cpp:156

Doing a bisect on the kernel showed the problem started following commit: bc35afdb182d4c48c889fe27ba7a5d7ea0c8194d drm/radeon/kms: add query for crtc hw id from crtc id to get info V2

As a test, in the X radeon dirver, I then changed drmmode_crtc_hw_id() in drmmode_display.c to ignore the value from the kernel:

--- xf86-video-ati-20100804/src/drmmode_display.c.orig 2010-08-04 21:54:57.000000000 +0100 +++ xf86-video-ati-20100804/src/drmmode_display.c 2010-08-07 22:14:56.000000000 +0100 @@ -547,7 +547,7 @@ drmmode_crtc->hw_id = -1; return; } - drmmode_crtc->hw_id = tmp; + drmmode_crtc->hw_id = -1; /*tmp;*/ }

static void

After this change glxgears and hugin both work as before the kernel upgrade.

X server 1.8.2 mesa 7.8.2 libdrm 2.4.21 radeon driver git cc0a167ff2db9b097891883ded147af1d67e4407

Sapphire X1650 pro AGP RADEON(0): Chipset: "ATI Radeon X1650" (ChipID = 0x71c6)