Created attachment 14787 [details]
xorg.conf

Intel driver version: 2:2.2.1-1
Mesa version: 7.0.3~rc2-1

Way to reproduce this bug (I'm using Debian Sid):
1. In Kpersonalizer, enable effect "Popup windows on panel" or something like 
that (I'm using Czech version, so I can't tell you exactly).
2. Launch application, which uses 2D accleration (XMoto) in windowed mode
3. Move xmoto window to place, where it'll be covered by popup window from 
panel.
4. And finally, move your cursor above any app in the panel, so the popup 
window will be displayed over the xmoto window.

(kdm.log output, xorg.conf should be attached)

X.Org X Server 1.4.0.90
Release Date: 5 September 2007
X Protocol Version 11, Revision 0
Build Operating System: Linux Debian (xorg-server 2:1.4.1~git20080131-1)
Current Operating System: Linux Rimmer 2.6.24.2 #11 SMP PREEMPT Fri Feb 22 
20:51
:26 CET 2008 i686
Build Date: 01 February 2008  03:49:13AM

        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Fri Feb 29 08:18:30 2008
(==) Using config file: "/etc/X11/xorg.conf"
(II) Module "ddc" already built-in
(EE) Failed to load module "type1" (module does not exist, 0)
(WW) intel: No matching Device section for instance (BusID PCI:0:2:1) found
(II) Module "ddc" already built-in
(II) Module "i2c" already built-in
(II) Module "ramdac" already built-in
expected keysym, got XF86KbdLightOnOff: line 70 of pc
expected keysym, got XF86KbdBrightnessDown: line 71 of pc
expected keysym, got XF86KbdBrightnessUp: line 72 of pc
Synaptics Touchpad The /dev/input/event* device nodes seem to be missing
Query no Synaptics: 6003C8
(EE) Synaptics Touchpad no synaptics touchpad detected and no repeater device
(EE) Synaptics Touchpad Unable to query/initialize Synaptics hardware.
(EE) PreInit failed for input device "Synaptics Touchpad"
expected keysym, got XF86KbdLightOnOff: line 70 of pc
expected keysym, got XF86KbdBrightnessDown: line 71 of pc
expected keysym, got XF86KbdBrightnessUp: line 72 of pc
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning:          Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
>                   Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server

(I've striped out many lines like this: I believe, there are irelevant to this 
bug)
SetClientVersion: 0 9
SetGrabKeysState - disabled
SetGrabKeysState - enabled
expected keysym, got XF86KbdLightOnOff: line 70 of pc


Error in I830WaitLpRing(), timeout for 2 seconds
pgetbl_ctl: 0x5ff80001 pgetbl_err: 0x100000
ipeir: 0 iphdr: 0
LP ring tail: 18658 head: 18500 len: 1f001 start 0
Err ID (eir): 0 Err Status (esr): 11 Err Mask (emr): ffffffdf
instdone: ffe5fafd instdone_1: fffff
instpm: 10
memmode: 0 instps: 4001e020
HW Status mask (hwstam): fff8dffe
IRQ enable (ier): a2 imr: fff80000 iir: 10
acthd: 10000000 dma_fadd_p: 10000080
ecoskpd: 307 excc: 0
cache_mode: 6800/180
mi_arb_state: 44
IA_VERTICES_COUNT_QW 0/0
IA_PRIMITIVES_COUNT_QW 0/0
VS_INVOCATION_COUNT_QW 0/0
GS_INVOCATION_COUNT_QW 0/0
GS_PRIMITIVES_COUNT_QW 0/0
CL_INVOCATION_COUNT_QW 0/0
CL_PRIMITIVES_COUNT_QW 1/0
PS_INVOCATION_COUNT_QW 36/0
PS_DEPTH_COUNT_QW c79ffd5d/0
WIZ_CTL 0
TS_CTL 0  TS_DEBUG_DATA fffd729e
TD_CTL 0 / 0
space: 130720 wanted 131064

Fatal server error:
lockup


Backtrace:
0: /usr/bin/X(xf86SigHandler+0x7e) [0x80c675e]
1: [0xb7f55420]
2: /usr/bin/X(XkbRemoveResourceClient+0xc1) [0x818dbc1]
3: /usr/bin/X [0x8085662]
4: /usr/bin/X(CloseDownDevices+0x29) [0x80858c9]
5: /usr/bin/X(AbortServer+0x23) [0x81bae93]
6: /usr/bin/X(FatalError+0x66) [0x81bb416]
7: /usr/lib/xorg/modules/drivers//intel_drv.so(I830WaitLpRing+0x17c) 
[0xb7ad1abc]
8: /usr/lib/xorg/modules/drivers//intel_drv.so(I830Sync+0x10d) [0xb7ad1d2d]
9: /usr/lib/xorg/modules/drivers//intel_drv.so [0xb7af149a]
10: /usr/lib/xorg/modules//libexa.so(exaWaitSync+0x52) [0xb7975762]
11: /usr/lib/xorg/modules//libexa.so(exaPrepareAccess+0x62) [0xb79760f2]
12: /usr/lib/xorg/modules//libexa.so(ExaCheckPutImage+0x35) [0xb797e535]
13: /usr/lib/xorg/modules//libexa.so [0xb79773d9]
14: /usr/bin/X [0x816f5f1]
15: /usr/bin/X [0x81422a6]
16: /usr/bin/X [0x8143414]
17: /usr/bin/X [0x8144134]
18: /usr/bin/X [0x814d86e]
19: /usr/bin/X(Dispatch+0x2bf) [0x808d1ef]
20: /usr/bin/X(main+0x48b) [0x807470b]
21: /lib/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7cd3450]
22: /usr/bin/X(FontFileCompleteXLFD+0x205) [0x8073a81]

FatalError re-entered, aborting
Caught signal 11.  Server aborting