On 2019/8/15 12:26, Matthew Ruffell wrote:
Hi, amd64 based Huawei servers have problems where the display output of their iBMC chips is broken, resulting in a "blurry" screen when viewed from their in house remote kvm-like console. Example: https://launchpadlibrarian.net/365907668/creen_picture_for_blur.png The issue is caused by the hibmc_drm kernel module being loaded. The PCI ID for the iBMC chips on amd64 hardware is the same as arm64 hardware, but the hibmc_drm driver was developed only for use on arm64 hardware, most notably for the Huawei D05 development board. The impact to Huawei is that their customers cannot use Ubuntu server install media as the screen goes "blurry" when the d-i install media or subuqity installer loads the hibmc_drm kernel module after language selection. The only workaround for their customers is to press the "E" key during the very first installer menu and adding "modprobe.blacklist=hibmc_drm" to the kernel command line in the grub menu. This is not good for customer experience with their servers. Huawei help site on the matter: https://support.huawei.com/enterprise/en/knowledge/EKB1100015521 Other problems exist for the hibmc_drm driver on amd64, such as working on bios, but not uefi, and not being wayland compatible, making the screen "blurry" whenever a desktop session is started and gdm loaded. More information about the above can be found on Launchpad: https://bugs.launchpad.net/bugs/1762940 Huawei have asked us to remove hibmc_drm from all architectures except arm64, and this aligns with advice from Hisilicon. Hibmc maintainers, can you please review the status of hibmc_drm on amd64 and confirm that these issues exist, and consider merging the patch to update Kconfig to set CONFIG_DRM_HISI_HIBMC arm64 only. Matthew Ruffell (1): drm/hisilicon/hibmc: Make CONFIG_DRM_HISI_HIBMC depend on ARM64 drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Thanks Matthew for the patch. For the patch, Acked-by: Xinliang Liu <z.liuxinliang@xxxxxxxxxxxxx> And applied and will push to drm maintainer soon. Thanks, Xinliang
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