Hi, I just upgraded to KDE-4.7.2 and Linux-3.1 and mostly when using Firefox, I get issues like a stall screen, then a short blank screen and then it works some time until that happens again. The kernel log then shows something like: WARNING: at drivers/gpu/drm/radeon/radeon_fence.c:267 radeon_fence_wait+0x215/0x292() Hardware name: TravelMate 6592 GPU lockup (waiting for 0x00158B0E last fence id 0x00158B0C) Modules linked in: [...] Pid: 12672, comm: Xorg Not tainted 3.1.0 #2 Call Trace: [<ffffffff8105c51d>] warn_slowpath_common+0x7e/0x96 [<ffffffff8105c5c9>] warn_slowpath_fmt+0x41/0x43 [<ffffffff8128bdad>] radeon_fence_wait+0x215/0x292 [<ffffffff810730fc>] ? abort_exclusive_wait+0x89/0x89 [<ffffffff8128c30c>] radeon_sync_obj_wait+0xc/0xe [<ffffffff8125f56e>] ttm_bo_wait+0xb8/0x174 [<ffffffff8125ffdb>] ? ttm_bo_list_ref_sub+0x24/0x26 [<ffffffff812a03c0>] radeon_gem_wait_idle_ioctl+0x7c/0xec [<ffffffff8124d2dd>] drm_ioctl+0x290/0x368 [<ffffffff812a0344>] ? radeon_gem_busy_ioctl+0x112/0x112 [<ffffffff8106993e>] ? set_current_blocked+0x44/0x49 [<ffffffff81028fe8>] ? do_signal+0x554/0x62a [<ffffffff810e7bf4>] do_vfs_ioctl+0x40d/0x44e [<ffffffff810293a5>] ? sys_rt_sigreturn+0x1b4/0x1e3 [<ffffffff810e7c77>] sys_ioctl+0x42/0x67 [<ffffffff81513dbb>] system_call_fastpath+0x16/0x1b ---[ end trace ac77b0f03ca6a6bd ]--- radeon 0000:01:00.0: GPU softreset radeon 0000:01:00.0: R_008010_GRBM_STATUS=0xA40034E0 radeon 0000:01:00.0: R_008014_GRBM_STATUS2=0x00010003 radeon 0000:01:00.0: R_000E50_SRBM_STATUS=0x200000C0 radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEE radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00000001 radeon 0000:01:00.0: R_008010_GRBM_STATUS=0xA0003030 radeon 0000:01:00.0: R_008014_GRBM_STATUS2=0x00000003 radeon 0000:01:00.0: R_000E50_SRBM_STATUS=0x200080C0 radeon 0000:01:00.0: GPU reset succeed radeon 0000:01:00.0: WB enabled [drm] ring test succeeded in 1 usecs [drm] ib test succeeded in 2 usecs radeon 0000:01:00.0: GPU lockup CP stall for more than 10000msec So far, I think it's great that it can recover pretty fine most of the time :-) I now upgraded to Linux-3.1.3 and looked at the KDE setting about the possible cause for this. New to me was the desktop effect setting about using "OpenGL-2-Shader". I deactivated it and its stable so far. Is this a know issue? Note: I also have the some effects disabled that are very slow when scrolling windows. My hardware: "ATI Mobility Radeon HD 2400 XT" (ChipID = 0x94c8) One other question: I saw that vdpau seems to be supported: [ 24.226] (II) RADEON(0): [DRI2] VDPAU driver: r600 What exactly is needed to use this? I tried "mplayer -vo vdpau" but that only gives me: Failed to open VDPAU backend libvdpau_r600.so: cannot open shared object file: No such file or directory [vdpau] Error when calling vdp_device_create_x11: 1 Error opening/initializing the selected video_out (-vo) device. Where can I get this file. Latest Debian does not seem to have it... Regards... HS -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html