3.7-rc2: corrupted image on Radeon HD 7800 after restarting X

When I restart my display manager (GDM) from tty0, I get a corrupted image where parts of the X display before I restarted GDM become visible on both the newly started X server instance as on tty0. When moving the mouse in X, the current (correct) image around the cursor is replaced by the image which was shown before X was started.

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI PITCAIRN PRO [Radeon HD 7800 Series] [1002:6819] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited Device [174b:e218]
Flags: bus master, fast devsel, latency 0, IRQ 48 Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f7d00000 (64-bit, non-prefetchable) [size=256K] I/O ports at e000 [size=256]
Expansion ROM at f7d40000 [disabled] [size=128K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1
Len=010 <?>

	Capabilities: [150] Advanced Error Reporting
	Capabilities: [270] #19
	Capabilities: [2b0] Address Translation Service (ATS)
	Capabilities: [2c0] #13
	Capabilities: [2d0] #1b
	Kernel driver in use: radeon

dmesg, .config, lspci and a picture showing a tty0 with parts of the image corrupted by the image of the GDM screen before it was restarted, can be found at http://artipc10.vub.ac.be/~frederik/linux-3.7-rc2/

Quoted 10 lines · Frederik Himpe

When I restart my display manager (GDM) from tty0, I get a corrupted image where parts of the X display before I restarted GDM become visible on both the newly started X server instance as on tty0. When moving the mouse in X, the current (correct) image around the cursor is replaced by the image which was shown before X was started.

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI PITCAIRN PRO [Radeon HD 7800 Series] [1002:6819] (prog-if 00 [VGA

Quoted 3 lines

dmesg, .config, lspci and a picture showing a tty0 with parts of the image corrupted by the image of the GDM screen before it was restarted, can be found at http://artipc10.vub.ac.be/~frederik/linux-3.7-rc2/

Please also provide the Xorg.0.log file from after you restarted gdm.