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(-)
Hisilicon developed hibmc_drm for their arm64 based soc and did not intend for this driver to be used on any other architecture than arm64.
Using it on amd64 leads to incorrect video modes being used, making the screen unreadable, forcing users to manually blacklist the module on the kernel command line to use the d-i server installer or any graphical sessions.
Make CONFIG_DRM_HISI_HIBMC firmly depend on ARM64 to ensure it is not built for other architectures.
Signed-off-by: Matthew Ruffell matthew.ruffell@canonical.com --- drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/Kconfig b/drivers/gpu/drm/hisilicon/hibmc/Kconfig index f20eedf0073a..35a3c5f0c38c 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/Kconfig +++ b/drivers/gpu/drm/hisilicon/hibmc/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only config DRM_HISI_HIBMC tristate "DRM Support for Hisilicon Hibmc" - depends on DRM && PCI && MMU + depends on DRM && PCI && MMU && ARM64 select DRM_KMS_HELPER select DRM_VRAM_HELPER
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@hisilicon.com And applied and will push to drm maintainer soon.
Thanks, Xinliang
dri-devel@lists.freedesktop.org
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Matthew Ruffell -
xinliang