New: sysfs: cannot create duplicate filename '/devices/platform/of-display'

https://bugzilla.kernel.org/show_bug.cgi?id=216095

            Bug ID: 216095
           Summary: sysfs: cannot create duplicate filename
                    '/devices/platform/of-display'
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.19-rc1
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 301127
--> https://bugzilla.kernel.org/attachment.cgi?id=301127&action=edit
dmesg (5.19-rc1, PowerMac G4 DP)

[...]
sysfs: cannot create duplicate filename '/devices/platform/of-display'

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-rc1-PMacG4+ #3
Call Trace:
[e9025cc0] [c05984d0] dump_stack_lvl+0x60/0x90 (unreliable)
[e9025ce0] [c02f043c] sysfs_warn_dup+0x64/0x84
[e9025d00] [c02f05cc] sysfs_create_dir_ns+0xfc/0x118
[e9025d30] [c059ffa4] kobject_add_internal+0x114/0x2f0
[e9025d60] [c05a0790] kobject_add+0x80/0xf0
[e9025da0] [c064c3d8] device_add+0x114/0x94c
[e9025e10] [c06f197c] of_platform_device_create_pdata+0xb8/0x144
[e9025e40] [c0c43bb4] of_platform_default_populate_init+0x284/0x2f4
[e9025e70] [c0007a94] do_one_initcall+0x50/0x294
[e9025ee0] [c0c03ff0] kernel_init_freeable+0x228/0x334
[e9025f20] [c0007efc] kernel_init+0x28/0x144
[e9025f40] [c0019334] ret_from_kernel_thread+0x5c/0x64

kobject_add_internal failed for of-display with -EEXIST, don't try to register things with the same name in the same directory.

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--- Comment #1 from Erhard F. ([email protected]) --- Created attachment 301128
--> https://bugzilla.kernel.org/attachment.cgi?id=301128&action=edit
kernel .config (5.19-rc1, PowerMac G4 DP)

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Hi Erhard,

This is presumably caused by:

52b1b46c39ae ("of: Create platform devices for OF framebuffers")

Can you try the patch below?

cheers

index 3507095a69f6..a70ff9df5cb9 100644
@@ -556,7 +556,7 @@ static int __init of_platform_default_populate_init(void)
 			if (!of_get_property(node, "linux,opened", NULL) ||
 			    !of_get_property(node, "linux,boot-display", NULL))
 				continue;
-			dev = of_platform_device_create(node, "of-display", NULL);
+			dev = of_platform_device_create(node, NULL, NULL);
 			if (WARN_ON(!dev))
 				return -ENOMEM;
 			boot_display = node;

@@ -565,7 +565,7 @@ static int __init of_platform_default_populate_init(void)
 		for_each_node_by_type(node, "display") {
 			if (!of_get_property(node, "linux,opened", NULL) || node == boot_display)
 				continue;
-			of_platform_device_create(node, "of-display", NULL);
+			of_platform_device_create(node, NULL, NULL);
 		}
 
 	} else {

https://bugzilla.kernel.org/show_bug.cgi?id=216095

--- Comment #2 from Erhard F. ([email protected]) --- Created attachment 301576
--> https://bugzilla.kernel.org/attachment.cgi?id=301576&action=edit
dmesg (6.0-rc1, PowerMac G5 11,2)

Still a problem in 6.0-rc1:

[...]
sysfs: cannot create duplicate filename '/devices/platform/of-display'

CPU: 0 PID: 1 Comm: swapper/0 Tainted: G                T  6.0.0-rc1-PMacG5 #1
Call Trace:
[c0000000015eb620] [c0000000006d0200] .dump_stack_lvl+0x7c/0xc4 (unreliable)
[c0000000015eb6b0] [c0000000003c2684] .sysfs_warn_dup+0x74/0xa0
[c0000000015eb740] [c0000000003c287c] .sysfs_create_dir_ns+0x11c/0x160
[c0000000015eb7e0] [c0000000006d9190] .kobject_add_internal+0x130/0x380
[c0000000015eb890] [c0000000006d9b28] .kobject_add+0x68/0xf0
[c0000000015eb920] [c00000000079005c] .device_add+0x13c/0xb40
[c0000000015eba10] [c00000000087b408] .of_device_add+0x58/0x70
[c0000000015eba90] [c00000000087bbd0]
.of_platform_device_create_pdata+0xc0/0x170
[c0000000015ebb30] [c00000000103a718]
.of_platform_default_populate_init+0x1cc/0x20c
[c0000000015ebbd0] [c00000000000f7b4] .do_one_initcall+0x64/0x250
[c0000000015ebcb0] [c000000001004400] .kernel_init_freeable+0x2ec/0x388
[c0000000015ebda0] [c00000000000fc10] .kernel_init+0x20/0x190
[c0000000015ebe10] [c00000000000bb50] .ret_from_kernel_thread+0x58/0x60

kobject_add_internal failed for of-display with -EEXIST, don't try to register things with the same name in the same directory.

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https://bugzilla.kernel.org/show_bug.cgi?id=216095

--- Comment #3 from Erhard F. ([email protected]) --- Created attachment 301577
--> https://bugzilla.kernel.org/attachment.cgi?id=301577&action=edit
kernel .config (6.0-rc1, PowerMac G5 11,2)

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Erhard F. ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

 Attachment #301577|0                           |1

is obsolete| |

--- Comment #4 from Erhard F. ([email protected]) --- Created attachment 301581
--> https://bugzilla.kernel.org/attachment.cgi?id=301581&action=edit
kernel .config (6.0-rc1, PowerMac G5 11,2)

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--- Comment #5 from Erhard F. ([email protected]) --- Created attachment 303182
--> https://bugzilla.kernel.org/attachment.cgi?id=303182&action=edit
dmesg (6.0-rc1, PowerMac G5 11,2)

Still shows up in 6.1-rc5:

[...]
sysfs: cannot create duplicate filename '/devices/platform/of-display'

CPU: 0 PID: 1 Comm: swapper/0 Tainted: G                T  6.1.0-rc5-PMacG5 #2
Hardware name: PowerMac11,2 PPC970MP 0x440101 PowerMac
Call Trace:
[c000000001b37610] [c000000000b4e7c0] .dump_stack_lvl+0x7c/0xd8 (unreliable)
[c000000001b376a0] [c00000000040c338] .sysfs_warn_dup+0x78/0xc0
[c000000001b37730] [c00000000040c56c] .sysfs_create_dir_ns+0x13c/0x160
[c000000001b377d0] [c000000000b5869c] .kobject_add_internal+0x14c/0x3c0
[c000000001b37870] [c000000000b590a8] .kobject_add+0x68/0x100
[c000000001b37900] [c0000000008074b0] .device_add+0xe0/0xbd0
[c000000001b379f0] [c000000000909f44] .of_device_add+0x44/0x70
[c000000001b37a60] [c00000000090a790]
.of_platform_device_create_pdata+0xc0/0x160
[c000000001b37b00] [c0000000010737e8]
.of_platform_default_populate_init+0x41c/0x4c4
[c000000001b37be0] [c00000000000fa84] .do_one_initcall+0x84/0x2b8
[c000000001b37cc0] [c000000001005c98] .kernel_init_freeable+0x420/0x54c
[c000000001b37da0] [c00000000000ff50] .kernel_init+0x20/0x190
[c000000001b37e10] [c00000000000bd58] .ret_from_kernel_thread+0x58/0x60

kobject_add_internal failed for of-display with -EEXIST, don't try to register things with the same name in the same directory.
PCI: Probing PCI hardware

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Erhard F. ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

 Attachment #301576|0                           |1
        is obsolete|                            |
 Attachment #301581|0                           |1
        is obsolete|                            |

--- Comment #6 from Erhard F. ([email protected]) --- Created attachment 303183
--> https://bugzilla.kernel.org/attachment.cgi?id=303183&action=edit
kernel .config (6.1-rc5, PowerMac G5 11,2)

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--- Comment #7 from Erhard F. ([email protected]) --- Created attachment 303509
--> https://bugzilla.kernel.org/attachment.cgi?id=303509&action=edit
dmesg (6.2-rc1, PowerMac G4 DP)

Now as the new ofdrm driver is in 6.2-rc1 the G4 fails to pick it up. ;)

When I try to load it manually as a module I get "Error: Driver 'of-display' is already registered, aborting..." in the dmesg.

When I build it statically into the kernel it says "of-display: probe of of-display failed with error -22".

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Erhard F. ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

 Attachment #301128|0                           |1

is obsolete| |

--- Comment #8 from Erhard F. ([email protected]) --- Created attachment 303510
--> https://bugzilla.kernel.org/attachment.cgi?id=303510&action=edit
kernel .config (6.2-rc1, PowerMac G4 DP)

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Michal Suchánek ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #9 from Michal Suchánek ([email protected]) --- Could you also attach the devicetree?

dtc -I fs -O dts /proc/device-tree > device-tree.dts

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--- Comment #10 from Erhard F. ([email protected]) --- Created attachment 303553
--> https://bugzilla.kernel.org/attachment.cgi?id=303553&action=edit
device tree - PowerMac G4 3,6 DP

(In reply to Michal Suchánek from comment #9)

Sorry for the delay, I overlooked your post!

I needed to force the output but otherwise it seemed to work fine:

# dtc -f -I fs -O dts /proc/device-tree > PowerMac-G4_3,6_device-tree.dts
<stdout>: ERROR (property_name_chars): /options:prev-lang:kbd: Bad character
':' in property 
Warning: Input tree has errors, output forced

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--- Comment #11 from Erhard F. ([email protected]) --- Created attachment 303554
--> https://bugzilla.kernel.org/attachment.cgi?id=303554&action=edit
device tree - PowerMac G5 11,2

Here's also the device tree of my G5, having the same issue.

It was not necessary to force the output via '-f' here but I got lots of warnings:

 # dtc -I fs -O dts /proc/device-tree > PowerMac-G5_11,2_device-tree.dts
<stdout>: Warning (reg_format): /smu@0,0:reg: property has invalid length (4
bytes) (#address-cells == 2, #size-cells == 1)
<stdout>: Warning (pci_bridge): /ht@0,f2000000/pci@4: missing ranges for PCI
bridge (or not a bridge)
<stdout>: Warning (pci_bridge): /ht@0,f2000000/pci@1: missing ranges for PCI
bridge (or not a bridge)
<stdout>: Warning (unit_address_format): Failed prerequisite 'pci_bridge'
<stdout>: Warning (pci_device_reg): Failed prerequisite 'reg_format'
<stdout>: Warning (pci_device_reg): Failed prerequisite 'pci_bridge'
<stdout>: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
<stdout>: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
<stdout>: Warning (simple_bus_reg): Failed prerequisite 'reg_format'
<stdout>: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
<stdout>: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
<stdout>: Warning (avoid_default_addr_size): /rom@0,ff800000/boot-rom@fff00000:
Relying on default #size-cells value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/escc@13000/ch-b@13000: Relying on default
#size-cells value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/escc@13000/ch-a@13020: Relying on default
#size-cells value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/i2s@0/i2s-c@14000: Relying on default #size-cells
value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/i2s@0/i2s-a@10000: Relying on default #size-cells
value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/escc-legacy@12000/ch-b@12000: Relying on default
#size-cells value
<stdout>: Warning (avoid_default_addr_size):
/ht@0,f2000000/pci@8/mac-io@7/escc-legacy@12000/ch-a@12004: Relying on default
#size-cells value
<stdout>: Warning (avoid_unnecessary_addr_size): Failed prerequisite
'avoid_default_addr_size'
<stdout>: Warning (unique_unit_address): Failed prerequisite
'avoid_default_addr_size'
<stdout>: Warning (chosen_node_stdout_path): /chosen:linux,stdout-path: Use
'stdout-path' instead
<stdout>: Warning (alias_paths): /aliases:ipc: aliases property is not a valid
node (/ipc)
<stdout>: Warning (alias_paths): /aliases:pci6: aliases property is not a valid
node (/ht/pci@6)
<stdout>: Warning (alias_paths): /aliases:nvram: aliases property is not a
valid node (/nvram)
<stdout>: Warning (alias_paths): /aliases:mac-io: aliases property is not a
valid node (/ht/pci@8/mac-io)
<stdout>: Warning (alias_paths): /aliases:usb3: aliases property is not a valid
node (/ht/pci@8/@b,1)
<stdout>: Warning (alias_paths): /aliases:pci4: aliases property is not a valid
node (/ht/pci@4)
<stdout>: Warning (alias_paths): /aliases:k2-sata: aliases property is not a
valid node (/ht/pci@9/k2-sata-root)
<stdout>: Warning (alias_paths): /aliases:macio-mpic: aliases property is not a
valid node (/ht/pci@8/mac-io/mpic)
<stdout>: Warning (alias_paths): /aliases:via-pmu: aliases property is not a
valid node (/ht/pci@8/mac-io/via-pmu)
<stdout>: Warning (alias_paths): /aliases:pci2: aliases property is not a valid
node (/ht/pci@2)
<stdout>: Warning (alias_paths): /aliases:ultra2: aliases property is not a
valid node (/ht/pci@9/k2-sata-root/k2-sata@2/disk@0)
<stdout>: Warning (alias_paths): /aliases:k2-mac-io: aliases property is not a
valid node (/ht/pci@8/mac-io)
<stdout>: Warning (alias_paths): /aliases:k2-fw: aliases property is not a
valid node (/ht/pci@9/firewire)
<stdout>: Warning (alias_paths): /aliases:ui2c: aliases property is not a valid
node (/u4/i2c)
<stdout>: Warning (alias_paths): /aliases:sccb: aliases property is not a valid
node (/ht/pci@8/mac-io/escc/ch-b)
<stdout>: Warning (alias_paths): /aliases:sd2: aliases property is not a valid
node (/ht/pci@9/k2-sata-root/k2-sata@2/disk@0)
<stdout>: Warning (alias_paths): /aliases:pci: aliases property is not a valid
node (/ht/pci@8)
<stdout>: Warning (alias_paths): /aliases:cpu3: aliases property is not a valid
node (/cpus/@3)
<stdout>: Warning (alias_paths): /aliases:k2-cd: aliases property is not a
valid node (/ht/pci@9/ata-6/disk@0)
<stdout>: Warning (alias_paths): /aliases:ultra0: aliases property is not a
valid node (/ht/pci@9/k2-sata-root/k2-sata@0/disk@0)
<stdout>: Warning (alias_paths): /aliases:hd: aliases property is not a valid
node (/ht/pci@9/k2-sata-root/k2-sata@0/disk@0)
<stdout>: Warning (alias_paths): /aliases:usb-2b: aliases property is not a
valid node (/ht/pci@8/@b,1)
<stdout>: Warning (alias_paths): /aliases:sd0: aliases property is not a valid
node (/ht/pci@9/k2-sata-root/k2-sata@0/disk@0)
<stdout>: Warning (alias_paths): /aliases:pci9: aliases property is not a valid
node (/ht/pci@9)
<stdout>: Warning (alias_paths): /aliases:sata: aliases property is not a valid
node (/ht/pci@9/k2-sata-root)
<stdout>: Warning (alias_paths): /aliases:fw: aliases property is not a valid
node (/ht/pci@9/firewire)
<stdout>: Warning (alias_paths): /aliases:cpu1: aliases property is not a valid
node (/cpus/@1)
<stdout>: Warning (alias_paths): /aliases:enet1: aliases property is not a
valid node (/ht/pci@2/@4,1)
<stdout>: Warning (alias_paths): /aliases:enet: aliases property is not a valid
node (/ht/pci@2/@4)
<stdout>: Warning (alias_paths): /aliases:pci7: aliases property is not a valid
node (/ht/pci@7)
<stdout>: Warning (alias_paths): /aliases:last-boot: aliases property is not a
valid node (/ht@0,f2000000/pci@2/bcom5714)
<stdout>: Warning (alias_paths): /aliases:wireless: aliases property is not a
valid node (/ht/pci@8/@1)
<stdout>: Warning (alias_paths): /aliases:pci10: aliases property is not a
valid node (/ht/pci@a)
<stdout>: Warning (alias_paths): /aliases:cd: aliases property is not a valid
node (/ht/pci@9/ata-6/disk@0)
<stdout>: Warning (alias_paths): /aliases:k2-uata: aliases property is not a
valid node (/ht/pci@9/ata-6)
<stdout>: Warning (alias_paths): /aliases:u4: aliases property is not a valid
node (/u4)
<stdout>: Warning (alias_paths): /aliases:pci5: aliases property is not a valid
node (/ht/pci@5)
<stdout>: Warning (alias_paths): /aliases:usb2: aliases property is not a valid
node (/ht/pci@8/@b)
<stdout>: Warning (alias_paths): /aliases:pci3: aliases property is not a valid
node (/ht/pci@3)
<stdout>: Warning (alias_paths): /aliases:ultra3: aliases property is not a
valid node (/ht/pci@9/k2-sata-root/k2-sata@3/disk@0)
<stdout>: Warning (alias_paths): /aliases:uata: aliases property is not a valid
node (/ht/pci@9/ata-6)
<stdout>: Warning (alias_paths): /aliases:sysclk: aliases property is not a
valid node (/smu/smu-i2c-control/i2c-bus@b/@d4)
<stdout>: Warning (alias_paths): /aliases:sd3: aliases property is not a valid
node (/ht/pci@9/k2-sata-root/k2-sata@3/disk@0)
<stdout>: Warning (alias_paths): /aliases:first-boot: aliases property is not a
valid node (/ht@0,f2000000/pci@9/k2-sata-root@c/k2-sata)
<stdout>: Warning (alias_paths): /aliases:pci1: aliases property is not a valid
node (/ht/pci@1)
<stdout>: Warning (alias_paths): /aliases:uni-mpic: aliases property is not a
valid node (/u4/mpic)
<stdout>: Warning (alias_paths): /aliases:ultra1: aliases property is not a
valid node (/ht/pci@9/k2-sata-root/k2-sata@1/disk@0)
<stdout>: Warning (alias_paths): /aliases:usb-2c: aliases property is not a
valid node (/ht/pci@8/@b,2)
<stdout>: Warning (alias_paths): /aliases:dart: aliases property is not a valid
node (/u4/dart)
<stdout>: Warning (alias_paths): /aliases:scca: aliases property is not a valid
node (/ht/pci@8/mac-io/escc/ch-a)
<stdout>: Warning (alias_paths): /aliases:sd1: aliases property is not a valid
node (/ht/pci@9/k2-sata-root/k2-sata@1/disk@0)
<stdout>: Warning (alias_paths): /aliases:cpu2: aliases property is not a valid
node (/cpus/@2)
<stdout>: Warning (alias_paths): /aliases:cd1: aliases property is not a valid
node (/ht/pci@9/ata-6/disk@1)
<stdout>: Warning (alias_paths): /aliases:usb-2a: aliases property is not a
valid node (/ht/pci@8/@b)
<stdout>: Warning (alias_paths): /aliases:pci8: aliases property is not a valid
node (/ht/pci@8)
<stdout>: Warning (alias_paths): /aliases:smu: aliases property is not a valid
node (/smu)
<stdout>: Warning (alias_paths): /aliases:ki2c: aliases property is not a valid
node (/ht/pci@8/mac-io/i2c)
<stdout>: Warning (alias_paths): /aliases:pci11: aliases property is not a
valid node (/ht/pci@b)
<stdout>: Warning (alias_paths): /aliases:rtc: aliases property is not a valid
node (/smu)
<stdout>: Warning (alias_paths): /aliases:uni-n: aliases property is not a
valid node (/u4)
<stdout>: Warning (alias_paths): /aliases:cpu0: aliases property is not a valid
node (/cpus/@0)

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--- Comment #12 from Michal Suchánek ([email protected]) --- Thanks for the DT dumps.

So you really do have two outputs but the problem is likely different:

The hardware-specific driver gets initialized earlier, and then the offb/ofdrm driver cannot get the resources for the framebuffer because the native driver is already using them.

That should be fine but the message it prints is not exactly clear.

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Erhard F. ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

 Attachment #303509|0                           |1

is obsolete| |

--- Comment #13 from Erhard F. ([email protected]) --- Created attachment 303600
--> https://bugzilla.kernel.org/attachment.cgi?id=303600&action=edit
dmesg (6.2-rc3, PowerMac G4 DP)

(In reply to Michal Suchánek from comment #12)

Two outputs? I got only a Radeon 9600 in the G4 and it does show up as a single card in lspci (no secondary output). Xorg.log. only shows a single device.

 # lspci 
0000:00:0b.0 Host bridge: Apple Inc. UniNorth 2 AGP
0000:00:10.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV350 [Radeon 9550/9600/X1050 Series]
0001:10:0b.0 Host bridge: Apple Inc. UniNorth 2 PCI
0001:10:12.0 USB controller: NEC Corporation OHCI USB Controller (rev 43)
0001:10:12.1 USB controller: NEC Corporation OHCI USB Controller (rev 43)
0001:10:12.2 USB controller: NEC Corporation uPD72010x USB 2.0 Controller (rev
04)
0001:10:13.0 Mass storage controller: Silicon Image, Inc. SiI 3112
[SATALink/SATARaid] Serial ATA Controller (rev 02)
0001:10:15.0 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865
Multi-I/O Controller
0001:10:15.1 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865
Multi-I/O Controller
0001:10:15.2 Parallel controller: Illegal Vendor ID Device 9865
0001:10:16.0 Network controller: Broadcom Inc. and subsidiaries BCM4306
802.11b/g Wireless LAN Controller (rev 02)
0001:10:17.0 Unassigned class [ff00]: Apple Inc. KeyLargo Mac I/O (rev 03)
0001:10:18.0 USB controller: Apple Inc. KeyLargo USB
0001:10:19.0 USB controller: Apple Inc. KeyLargo USB
0001:10:1b.0 USB controller: NEC Corporation OHCI USB Controller (rev 43)
0001:10:1b.1 USB controller: NEC Corporation OHCI USB Controller (rev 43)
0001:10:1b.2 USB controller: NEC Corporation uPD72010x USB 2.0 Controller (rev
04)
0002:20:0b.0 Host bridge: Apple Inc. UniNorth 2 Internal PCI
0002:20:0d.0 Unassigned class [ff00]: Apple Inc. UniNorth 2 ATA/100
0002:20:0e.0 FireWire (IEEE 1394): Apple Inc. UniNorth 2 FireWire (rev 01)
0002:20:0f.0 Ethernet controller: Apple Inc. UniNorth 2 GMAC (Sun GEM)

 # lspci -v -s 0000:00:10.0
0000:00:10.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV350 [Radeon 9550/9600/X1050 Series] (prog-if 00 [VGA controller])
        Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] R9600 Pro primary
(Asus OEM for HP)
        Device tree node:
/sys/firmware/devicetree/base/pci@f0000000/ATY,AlteracParent@10
        Flags: bus master, 66MHz, medium devsel, latency 255, IRQ 48
        Memory at a0000000 (32-bit, prefetchable) [size=256M]
        I/O ports at 0400 [disabled] [size=256]
        Memory at 90000000 (32-bit, non-prefetchable) [size=64K]
        Expansion ROM at 90020000 [disabled] [size=128K]
        Capabilities: [58] AGP version 2.0
        Capabilities: [50] Power Management version 2

Ok. To rule out influence of other drivers I disabled them (# CONFIG_FB is not set, # CONFIG_DRM_RADEON is not set) and only set CONFIG_DRM=y, CONFIG_DRM_OFDRM=y but it made no difference. Sill I get this:
sysfs: cannot create duplicate filename '/devices/platform/of-display' [...]
of-display: probe of of-display failed with error -22

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https://bugzilla.kernel.org/show_bug.cgi?id=216095

--- Comment #14 from Erhard F. ([email protected]) --- Created attachment 303601
--> https://bugzilla.kernel.org/attachment.cgi?id=303601&action=edit
kernel .config (6.2-rc3, PowerMac G4 DP)

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--- Comment #15 from Michal Suchánek ([email protected]) --- You do have two outputs defined in the device tree:

/pci@f0000000/ATY,AlteracParent@10/ATY,Alterac_A@0 /pci@f0000000/ATY,AlteracParent@10/ATY,Alterac_B@1

If they correspond to a physical outputs is another question. After all if one of the outputs exists only on some card models it would never detect a connected screen on the cards on which the output does not physically exist and everything will work just fine.

Here is a patch that aims to resolve the problem
https://lore.kernel.org/lkml/[email protected]/

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Erhard F. ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

--- Comment #16 from Erhard F. ([email protected]) --- Fix landed in 6.2 and 6.1 LTS meanwhile. Thanks!

Closing here.

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Michael Ellerman ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|RESOLVED                    |CLOSED
                 CC|                            |[email protected]
         Resolution|OBSOLETE                    |CODE_FIX

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