Hi, On a Lenovo Thinkpad X220 with Gen6 (SNB) integrated graphics, I occasionally get screen corruption under X. Every time this happens I'm seeing the following in dmesg. This is a vanilla Linux 3.1 kernel. Cheers, - Udo ------------[ cut here ]------------ WARNING: at drivers/gpu/drm/i915/i915_drv.c:387 __gen6_gt_wait_for_fifo+0x63/0x6e() Hardware name: 4290W4H Pid: 1671, comm: X Not tainted 3.1.0 #1 Call Trace: [<ffffffff81036028>] ? warn_slowpath_common+0x73/0x87 [<ffffffff811efe99>] ? __gen6_gt_wait_for_fifo+0x63/0x6e [<ffffffff81223835>] ? gen6_ring_put_irq+0x66/0xa6 [<ffffffff8120001c>] ? i915_wait_request+0x2e0/0x3b9 [<ffffffff812250ea>] ? render_ring_flush+0xa1/0xac [<ffffffff8104bdd1>] ? abort_exclusive_wait+0x79/0x79 [<ffffffff8120014e>] ? i915_gem_flush_ring+0x24/0xdc [<ffffffff812053f0>] ? i915_gem_do_execbuffer.clone.8+0xd7b/0x11cf [<ffffffff81205ccf>] ? i915_gem_execbuffer2+0x12b/0x1ac [<ffffffff811dfbb6>] ? drm_ioctl+0x251/0x306 [<ffffffff81205ba4>] ? i915_gem_execbuffer+0x360/0x360 [<ffffffff81008734>] ? init_fpu+0x10b/0x124 [<ffffffff81008b38>] ? check_for_xstate+0x1c/0x71 [<ffffffff810b1761>] ? do_vfs_ioctl+0x404/0x445 [<ffffffff81001b25>] ? sys_rt_sigreturn+0x196/0x1c5 [<ffffffff810b17de>] ? sys_ioctl+0x3c/0x5e [<ffffffff813c1bfb>] ? system_call_fastpath+0x16/0x1b ---[ end trace 63d59cd44de45e89 ]---
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