In the Linux kernel, the following vulnerability has been resolved:

drm/mediatek: Disable AFBC support on Mediatek DRM driver

Commit c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM driver") added AFBC support to Mediatek DRM and enabled the 32x8/split/sparse modifier.

However, this is currently broken on Mediatek MT8188 (Genio 700 EVK platform); tested using upstream Kernel and Mesa (v25.2.1), AFBC is used by default since Mesa v25.0.

Kernel trace reports vblank timeouts constantly, and the render is garbled:

[CRTC:62:crtc-0] vblank wait timed out WARNING: CPU: 7 PID: 70 at drivers/gpu/drm/drmatomichelper.c:1835 drmatomichelperwaitforvblanks.part.0+0x24c/0x27c [...] Hardware name: MediaTek Genio-700 EVK (DT) Workqueue: eventsunbound commitwork pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : drmatomichelperwaitforvblanks.part.0+0x24c/0x27c lr : drmatomichelperwaitforvblanks.part.0+0x24c/0x27c sp : ffff80008337bca0 x29: ffff80008337bcd0 x28: 0000000000000061 x27: 0000000000000000 x26: 0000000000000001 x25: 0000000000000000 x24: ffff0000c9dcc000 x23: 0000000000000001 x22: 0000000000000000 x21: ffff0000c66f2f80 x20: ffff0000c0d7d880 x19: 0000000000000000 x18: 000000000000000a x17: 000000040044ffff x16: 005000f2b5503510 x15: 0000000000000000 x14: 0000000000000000 x13: 74756f2064656d69 x12: 742074696177206b x11: 0000000000000058 x10: 0000000000000018 x9 : ffff800082396a70 x8 : 0000000000057fa8 x7 : 0000000000000cce x6 : ffff8000823eea70 x5 : ffff0001fef5f408 x4 : ffff80017ccee000 x3 : ffff0000c12cb480 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c12cb480 Call trace: drmatomichelperwaitforvblanks.part.0+0x24c/0x27c (P) drmatomichelpercommittailrpm+0x64/0x80 committail+0xa4/0x1a4 commitwork+0x14/0x20 processonework+0x150/0x290 workerthread+0x2d0/0x3ec kthread+0x12c/0x210 retfromfork+0x10/0x20 ---[ end trace 0000000000000000 ]---

Until this gets fixed upstream, disable AFBC support on this platform, as it's currently broken with upstream Mesa.