Comment 132 for bug 127101

Testing xserver-xorg-video-intel_2.1.1-0ubuntu7~bwh1_i386.deb with EXA acceleration:

VT switch OK, suspend/resume ok, video ok. Video playing while switching to VT1 and back - "blue screen" on the video output window (kaffeine/libxine/xv), and the X server resets after a couple of seconds. No useful info in Xor.0.log.old, it ends with the following:

(II) intel(0): [drm] removed 1 reserved context for kernel
(II) intel(0): [drm] unmapping 8192 bytes of SAREA 0xf8afd000 at 0xb7bd7000
(EE) intel(0): I830 Vblank Pipe Setup Failed 0
(EE) intel(0): I830 Vblank Pipe Setup Failed 0
(EE) intel(0): I830 Vblank Pipe Setup Failed 0
(II) intel(0): xf86UnbindGARTMemory: unbind key 0
(II) intel(0): xf86UnbindGARTMemory: unbind key 1
(II) intel(0): xf86UnbindGARTMemory: unbind key 2
(II) intel(0): xf86UnbindGARTMemory: unbind key 3
(II) intel(0): xf86UnbindGARTMemory: unbind key 4
(II) intel(0): xf86UnbindGARTMemory: unbind key 5

but kdm.log has some interesting stuff:

Error in I830WaitLpRing(), timeout for 2 seconds
pgetbl_ctl: 0x7ffc0001 pgetbl_err: 0x0
ipeir: 0 iphdr: 1810000
LP ring tail: 2250 head: 2244 len: 1f801 start 0
eir: 0 esr: 0 emr: ffff
instdone: ffc0 instpm: 0
memmode: 306 instps: f0000
hwstam: fffe ier: a2 imr: 0 iir: 250
Ring at virtual 0xa7934000 head 0x2244 tail 0x2250 count 3
        000021c4: 00000000
        000021c8: 02000011
        000021cc: 00000000
        000021d0: 02000011
        000021d4: 00000000
        000021d8: 02000011
        000021dc: 00000000
        000021e0: 02000011
        000021e4: 00000000
        000021e8: 02000011
        000021ec: 00000000
        000021f0: 02000011
        000021f4: 00000000
        000021f8: 02000011
        000021fc: 00000000
        00002200: 02000011
        00002204: 00000000
        00002208: 02000011
        0000220c: 00000000
        00002210: 02000011
        00002214: 00000000
        00002218: 02000011
        0000221c: 00000000
        00002220: 02000011
        00002224: 00000000
        00002228: 02000011
        0000222c: 00000000
        00002230: 02000011
        00002234: 00000000
        00002238: 02000011
        0000223c: 00000000
        00002240: 01810000
        00002244: 00000000
Ring end
space: 131052 wanted 131064

Fatal server error:
lockup

(EE) intel(0): I830 Vblank Pipe Setup Failed 0
(EE) intel(0): I830 Vblank Pipe Setup Failed 0
(EE) intel(0): I830 Vblank Pipe Setup Failed 3
(EE) intel(0): I830 Vblank Pipe Setup Failed 3