radeon_fbdev_river_fbdev: failed to initialize framebuffer and setup emulation

[Christian Zigotzky <chzigotzky@xenosoft.de>]

On 04 August 2025 at 04:42 pm, Alex Deucher wrote:
> On Sun, Aug 3, 2025 at 11:28 AM Christian Zigotzky
> <chzigotzky@xenosoft.de> wrote:
>>
>> Hello,
>>
>> I have the same issue on another machine either. Blank screen during the
>> boot. The Radeon graphics framebuffer device doesn't work anymore.
>>
>> Here is the modifed code from the DRM updates (drm-next-2025-07-30):
>>
>> -
>> https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/gpu/drm/radeon/radeon_fbdev.c?id=260f6f4fda93c8485c8037865c941b42b9cba5d2
>> -
>> https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/gpu/drm/radeon/radeon_drv.c?id=260f6f4fda93c8485c8037865c941b42b9cba5d2
> 
> This change just bumps the driver version it shouldn't affect the fbdev.
> 
>> -
>> https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/gpu/drm/radeon/radeon_display.c?id=260f6f4fda93c8485c8037865c941b42b9cba5d2
>> -
>> https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/gpu/drm/radeon/evergreen_cs.c?id=260f6f4fda93c8485c8037865c941b42b9cba5d2
> 
> This only affects acceleration, it should not affect fbdev.
> 
> What chip are you using?  Can you attach your full dmesg output?  Can
> you bisect?  This cultrit could be a core drm change.
> 
> Alex
> 
>>
>> Do you have a patch for reverting these modifications? I would like to
>> revert these modifications for testing.
>>
>> Thanks in advance,
>> Christian
>>
>> On 03 August 2025 at 1:35 pm, Christian Zigotzky wrote:
>>> Hello,
>>>
>>> Xorg doesn't work after the DRM updates drm-next-2025-07-30.
>>>
>>> Error messages:
>>>
>>> [dr:.radeon_fbdev_river_fbdev_proe] *ERROR* failed to initialize
>>> framebuffer -22
>>> radeon 0000:01:0.0: [drm] *ERRO* fbdev: Failedto setup emulaton (ret=-22)
>>> brd module loadedm
>>> lop: module loadd
>>> mpt3ss version 52.10.00.00 loaded
>>> nve nvme0: pci fuction 0002:04:0.0
>>> fsl-sata ffe20000.sata: SataFSL Platform/CS Driver init
>>> scs host0: sata_fs
>>> ta1: SATA max DMA/133 irq 68 pm-pol 0
>>> ;21;39mfsl-sat ffe221000.sata Sata FSL Platfrm/CSB Driver iit
>>> ata1: Signatue Update detectd @ 0 msecs
>>> scsihost1: sata_fsl[0m
>>> ta2: SATA max UMA/133 irq 69 lm-pol 0
>>> nvme nvm0: 4/0/0 defaul/read/poll queus
>>> nvme0n1: p1 p p3 p4 p5 p6 p7[0m
>>> drm:.radeon_fbdv_driver_fbdev_robe] *ERROR* filed to initialze
>>> framebuffer 22
>>> fsl_dpaa_mac fe4e6000.ethernt: of_get_mac_adress(/soc@ffe00000/
>>> fman@40000/ethernet@e6000 failed
>>> radeon 000:01:00.0: [dr] *ERROR* fbdev Failed to setu emulation (ret-22)
>>> fsl_dpaa_ma ffe4e6000.ethenet: FMan MEMAC[0m
>>> sl_dpaa_mac ffee6000.ethernet:Using random MA address: 0e
>>>
>>> Could you please check the latest DRM updates?
>>>
>>> Thanks,
>>> Christian
>>>
>>

Hello Alex,

Thanks for your answer.

I use a BARTS chip (Radeon HD6870). I would like to bisect but I don't 
have time for it currently. Sorry

There are some other user reports:

- https://forum.hyperion-entertainment.com/viewtopic.php?p=60606#p60606
- https://forum.hyperion-entertainment.com/viewtopic.php?p=60595#p60595

They use other Radeon graphics chips.

Bug report: https://github.com/chzigotzky/kernels/issues/15

What do you think about the following commit?

Link: 
https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0e7d5874fb6b80c44be3cfbcf1cf356e81d91232

@Hypex
Could you please attach your full dmesg output?

Thanks,
Christian