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[r300] Xorg screen is garbled with radeon/EXA driver (AGP, mesa-20.0.4)

X only works properly with fbdev driver on this machine. The screen is garbled when using radeon/EXA driver (see attached screenshot). Interestingly Xorg.0.log shows nothing suspicious... Also console output is fine.

Currently the machine is running mesa 20.0.4 but issue is the same with 19.3.5. Did not try earliear versions. Also does not matter if I run kernel 5.5.x, 5.6.x or 5.7-rc1. Desktop environment does not matter either IMHO. MATE is used here but already the login screen of lightdm is garbled. I attached a 2nd screenshot what the desktop should looke like.

Some data about the machine:

 # inxi -b
System:    Kernel: 5.7.0-rc1-Pentium4 i686 bits: 32 Console: tty 2 Distro: Gentoo Base System release 2.6 
Machine:   Type: Desktop Mobo: Shuttle model: FS51 serial: <superuser/root required> BIOS: Phoenix v: 6.00 PG date: 12/02/2003 
CPU:       Single Core: Intel Pentium 4 type: MCP speed: 2797 MHz 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] RV350 [Radeon 9550/9600/X1050 Series] driver: radeon v: kernel 
           Display: server: X.org 1.20.7 driver: radeon tty: 240x67 
           Message: Advanced graphics data unavailable in console. Try -G --display 
Network:   Device-1: Ralink RT2500 Wireless 802.11bg driver: rt2500pci 
           Device-2: Realtek RTL-8100/8101L/8139 PCI Fast Ethernet Adapter driver: 8139too 

 # lspci 
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 651 Host (rev 02)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS962 [MuTIOL Media IO] LPC Controller (rev 14)
00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2/3 SMBus controller
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 IDE Controller
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] SiS7012 AC'97 Sound Controller (rev a0)
00:03.0 USB controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.1 USB controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.2 USB controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.3 USB controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:0a.0 Network controller: Ralink corp. RT2500 Wireless 802.11bg (rev 01)
00:0f.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet Adapter (rev 10)
00:10.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev 46)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV350 [Radeon 9550/9600/X1050 Series]
01:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV350 [Radeon 9550/9600/X1050 Series] (Secondary)

 # lspci -vv -s 01:00.0
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV350 [Radeon 9550/9600/X1050 Series] (prog-if 00 [VGA controller])
	Subsystem: PC Partner Limited / Sapphire Technology RV350 [Radeon 9550/9600/X1050 Series]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 32 (2000ns min), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at c0000000 (32-bit, prefetchable) [size=256M]
	Region 1: I/O ports at d000 [size=256]
	Region 2: Memory at e5000000 (32-bit, non-prefetchable) [size=64K]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [58] AGP version 2.0
		Status: RQ=80 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3- Rate=x1,x2,x4
		Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x4
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: radeon
	Kernel modules: radeon

 # cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping	: 7
microcode	: 0x33
cpu MHz		: 2796.184
cache size	: 512 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cpuid cid xtpr
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
bogomips	: 5594.38
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 32 bits virtual
power management:

config_571-rc1_p4 dmesg_57-rc1_p4.txt exa_Xorg.0.log fbdev_Xorg.0.log exa_screenshot fbdev_screenshot