=== when hit a key (backlight switched on, blank screen):
* syslog: nothing there
* Xorg.0.log:
Enable CRTC 0 success
Unblank CRTC 0 success
Output 51 enable success

=== when switched to text (working text mode):
* syslog:
Feb 11 17:15:33 pccross kernel: [90294.560596] [drm] Num pipes: 1
* Xorg.0.log:
[ 2565.496525] (II) AIGLX: Suspending AIGLX clients for VT switch
Output 51 disable success
Blank CRTC 0 success
Disable CRTC 0 success
Blank CRTC 1 success
Disable CRTC 1 success
[ 2565.504541] (II) RADEON(0): RADEONRestoreMemMapRegisters() : 
[ 2565.504549] (II) RADEON(0):   MC_FB_LOCATION   : 0x7fff7800 0x7fff7800
[ 2565.504557] (II) RADEON(0):   MC_AGP_LOCATION  : 0x003f0000
[ 2565.514640] (II) RADEON(0): avivo_restore !
Enable CRTC 1 success
Unblank CRTC 1 success
Enable CRTC 0 success
Unblank CRTC 0 success

=== when switched back to graphic vt (got blank screen):
* syslog:
Feb 11 17:16:34 pccross acpid: client connected from 17598[0:0] 
Feb 11 17:16:34 pccross kernel: [90355.684343] [drm] Loading RS690/RS740 Microcode
Feb 11 17:16:34 pccross kernel: [90355.684358] [drm] Num pipes: 1
* Xorg.0.log:
[ 2565.496525] (II) AIGLX: Suspending AIGLX clients for VT switch
Output 51 disable success
Blank CRTC 0 success
Disable CRTC 0 success
Blank CRTC 1 success
Disable CRTC 1 success
[ 2565.504541] (II) RADEON(0): RADEONRestoreMemMapRegisters() : 
[ 2565.504549] (II) RADEON(0):   MC_FB_LOCATION   : 0x7fff7800 0x7fff7800
[ 2565.504557] (II) RADEON(0):   MC_AGP_LOCATION  : 0x003f0000
[ 2565.514640] (II) RADEON(0): avivo_restore !
Enable CRTC 1 success
Unblank CRTC 1 success
Enable CRTC 0 success
Unblank CRTC 0 success
[ 2626.598017] (II) Open ACPI successful (/var/run/acpid.socket)
[ 2626.598088] (II) AIGLX: Resuming AIGLX clients after VT switch
Output 68 disable success
Output 26 disable success
Output 51 disable success
Blank CRTC 0 success
Disable CRTC 0 success
Blank CRTC 1 success
Disable CRTC 1 success
Output 51 disable success
Blank CRTC 0 success
Disable CRTC 0 success
Mode 1600x1200 - 2160 1250 5
[ 2626.606213] (II) RADEON(0): RADEONRestoreMemMapRegisters() : 
[ 2626.606221] (II) RADEON(0):   MC_FB_LOCATION   : 0x7fff7800 0x7fff7800
[ 2626.606229] (II) RADEON(0):   MC_AGP_LOCATION  : 0x81ff8000
freq: 162000000
best_freq: 161995000
best_feedback_div: 543
best_ref_div: 8
best_post_div: 6
[ 2626.617222] (II) RADEON(0): crtc(0) Clock: mode 162000, PLL 161990
[ 2626.617230] (II) RADEON(0): crtc(0) PLL  : refdiv 8, fbdiv 0x21F(543), pdiv 6
Set CRTC PLL success
Set CRTC Timing success
Not using RMX
scaler 0 setup success
Set CRTC 0 Source success
[ 2626.619745] (II) RADEON(0): Coherent Mode enabled
Output digital setup success
Output 51 enable success
Enable CRTC 0 success
Unblank CRTC 0 success
Output 68 disable success
Output 26 disable success
Blank CRTC 1 success
Disable CRTC 1 success
[ 2626.620331] (II) RADEON(0): [RESUME] Attempting to re-init Radeon hardware.
[ 2626.752554] (II) Logitech USB Receiver: Device reopened after 1 attempts.
[ 2626.764528] (II) Das Keyboard: Device reopened after 1 attempts.
[ 2626.776518] (II) bttv IR (card=6): Device reopened after 1 attempts.
[ 2626.788567] (II) Macintosh mouse button emulation: Device reopened after 1 attempts.


=== after gdm restart (got working graphic screen):
* syslog:
Feb 11 17:18:36 pccross kernel: [90477.935345] [drm] Num pipes: 1
Feb 11 17:18:36 pccross kernel: [90478.055464] mtrr: MTRR 5 not used
Feb 11 17:18:36 pccross acpid: client connected from 18729[0:0] 
Feb 11 17:18:37 pccross kernel: [90479.133911] [drm] Setting GART location based on new memory map
Feb 11 17:18:37 pccross kernel: [90479.134332] [drm] Loading RS690/RS740 Microcode
Feb 11 17:18:37 pccross kernel: [90479.134349] [drm] Num pipes: 1
Feb 11 17:18:37 pccross kernel: [90479.134355] [drm] writeback test succeeded in 1 usecs
* Xorg.0.log: new one was created.