https://bugs.freedesktop.org/show_bug.cgi?id=43448 --- Comment #9 from Stefan <freedesktop@xxxxxxxxxxx> 2012-05-28 02:24:02 PDT --- Hello, I think I have found a solution for this problem and another. I have the same notebook with that graphics card and had some problems with it in the past months whenever I tried the open source driver from Debian unstable. It worked about a year ago but then I bought a 27" monitor which was only usable with its native resolution of 2560x1440 with the fglrx driver (which had some other problems by the way). I regularly tried the open source driver when new versions show up in Debian but since some months the XServer crashed immediately after the start with a segfault. In newer versions it became more graceful with the following log messages: (EE) RADEON(0): radeon_surface_best failed (EE) RADEON(0): radeon_setup_kernel_mem failed After debugging like suggested in bug #48138 I found out that there is missing a case in r6_init_hw_info for setting num_banks. While there are cases for 0 and 1 the FirePro M7740 has a value of 2 at some bits of the tiling_config so it returns with -EINVAL from the default case. First I did not know on what to set num_banks in that case but tried something and the XServer started successfully with that change. Then I saw in /var/log/Xorg.0.log that the 3D acceleration was not working like described in this bug report: (EE) AIGLX error: Calling driver entry point failed (EE) AIGLX: reverting to software rendering I tried to debug that too, following the above hints and ended up in r600_interpret_tiling in src/gallium/drivers/r600/r600_pipe.c in the MESA code and found exactly the same reason as above, a missing case 2. In the meantime I checked out the source of xserver-xorg-video-ati too and sensitized by the above findings made a grep over all three source trees (libdri, mesa, xserver-xorg-video-ati): grep "num_banks.*=" -rsn . -B 2 -A 1 There I found another missing case 2 in r600_interpret_tiling in src/radeon_kms.c and somewhere else an existing case 2 with num_banks = 16. So I patched all found asymmetries regarding case 2 and the 3D acceleration began to work again. I append all three patches I made. Maybe someone can check them and add them if they are reasonable so future versions can incorporate the fixes. Best regards Stefan Kanarski PS: Now my only problem is the resolution of 2560x1440 with my Fujitsu P27T-6. Via DVI I only get 1280x1440 (every second pixel column missing, looks like single-link although the cable should be dual-link) and via DisplayPort the monitor is toggling between power save and a black screen. But that's another story for another day or two. If someone has an idea where to start looking I am glad to hear. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
