i915 screen corruption

[Udo Steinberg]

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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