Comment 80 for bug 921236

Created attachment 58374
Xorg log

I have Archlinux (linux-3.2.9) running on Radeon 4550 using radeon with xf86-video-ati 6.14.3, xorg 1.12 and mesa 8.0.1.
I have two monitors attached using DVI (Dell 2408WFP) and HDMI (Toshiba TV).

While running
xrandr --output HDMI-0 --auto
xrandr --output HDMI-0 --below DVI-0
Xorg hangs.
Here is the Xorg.0.log (full log is attached):

[ 730.765] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
[ 730.765] BUG: getevents.c:843 in scale_to_desktop()
[ 730.765]
[ 730.765] Backtrace:
[ 730.765] 0: /usr/bin/X (xorg_backtrace+0x34) [0x5684f4]
[ 730.765] 1: /usr/bin/X (0x400000+0x471e4) [0x4471e4]
[ 730.765] 2: /usr/bin/X (0x400000+0x47db5) [0x447db5]
[ 730.765] 3: /usr/bin/X (GetPointerEvents+0x352) [0x449452]
[ 730.765] 4: /usr/bin/X (0x400000+0x152c56) [0x552c56]
[ 730.766] 5: /usr/bin/X (miPointerWarpCursor+0xce) [0x55308e]
[ 730.766] 6: /usr/bin/X (0x400000+0x6c532) [0x46c532]
[ 730.766] 7: /usr/bin/X (0x400000+0x15357e) [0x55357e]
[ 730.766] 8: /usr/bin/X (0x400000+0xf3841) [0x4f3841]
[ 730.766] 9: /usr/bin/X (0x400000+0xdf2ee) [0x4df2ee]
[ 730.766] 10: /usr/bin/X (RRPointerScreenConfigured+0x75) [0x4df535]
[ 730.766] 11: /usr/bin/X (RRTellChanged+0x122) [0x4d9282]
[ 730.766] 12: /usr/bin/X (RRCrtcSet+0x33d) [0x4da41d]
[ 730.766] 13: /usr/bin/X (ProcRRSetCrtcConfig+0x3b3) [0x4db273]
[ 730.767] 14: /usr/bin/X (0x400000+0x33cf9) [0x433cf9]
[ 730.767] 15: /usr/bin/X (0x400000+0x2319a) [0x42319a]
[ 730.767] 16: /lib/libc.so.6 (__libc_start_main+0xed) [0x2ba545a7a38d]
[ 730.767] 17: /usr/bin/X (0x400000+0x234bd) [0x4234bd]

The same behaviour is seen using xf86-video-ati-git and xorg-git.