radeon_fbdev_river_fbdev: failed to initialize framebuffer and setup emulation

On 04 August 2025 at 04:42 pm, Alex Deucher wrote:

On Sun, Aug 3, 2025 at 11:28 AM Christian Zigotzky
[off-list ref] wrote:

quoted

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.

quoted

-
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

quoted

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:

quoted

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