Hello, unfortunatly I have to report a bug. Distribution: gentoo Hardware: IBM ThinkPad R40 with a 32bit Pentium-M RV200/M7 [Mobility Radeon 7500] Bug report on gentoo: https://bugs.gentoo.org/717360 I have flickering black lines on X when booting the kernel I compiled from sys-kernel/gentoo-sources-5.4.28 and several following 5.x.x-kernels. No problems with sys-kernel/gentoo-sources-4.19.97. When the problem persisted I did a bisect. Result is: commit 33b3ad3788aba846fc8b9a065fe2685a0b64f713 Author: Christoph Hellwig <hch@lst.de> Date: Thu Aug 15 09:27:00 2019 +0200 drm/radeon: handle PCIe root ports with addressing limitations radeon uses a need_dma32 flag to indicate to the drm core that some allocations need to be done using GFP_DMA32, but it only checks the device addressing capabilities to make that decision. Unfortunately PCIe root ports that have limited addressing exist as well. Use the dma_addressing_limited instead to also take those into account. Reviewed-by: Christian König <christian.koenig@amd.com> Reported-by: Atish Patra <Atish.Patra@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> drivers/gpu/drm/radeon/radeon.h | 1 - drivers/gpu/drm/radeon/radeon_device.c | 12 +++++------- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- 3 files changed, 6 insertions(+), 9 deletions(-) I hope this is relevant and I provide sufficent information! Please let me know if there's more I can provide.
Created attachment 289761 [details] bisect.log
Created attachment 289763 [details] Photo of flickering black lines on screen.
Created attachment 289765 [details] Xorg.0.log
Created attachment 289767 [details] dmesg
Created attachment 289769 [details] config-5.4.28-gentoo
Created attachment 289771 [details] emerge --info
Hello, are there any news about this issue? Is there anything I can do? Thanks for your attention!
Hello, today I tried sys-kernel/gentoo-sources-5.8.0-r1 and the flickering is still there. When I disable 'High Memory Support' the flickering does not happen. (I found that somewhere on the net.) But with 'High Memory Support' set to '4GB' it shows up. Unfortunately I need all of the installed 2GB RAM so I need to set 'High Memory Support' to '4GB'... Is there anything I can do / provide? Thanks a lot for your attention!
Seems to be resolved. Tried it again with sys-kernel/gentoo-sources-5.4.92 and nothing flickers.