Comment # 39
on bug 109345
from Christian Zigotzky
Hi All, Allan has successfully tested the eleventh test kernel. He wrote: Christian DRM11 boots to Firepro. ace ------ We have a result! git bisect good The following commit is responsible for the issue: 3d42f1ddc47a69c0ce155f9f30d764c4d689a5fa is the first bad commit commit 3d42f1ddc47a69c0ce155f9f30d764c4d689a5fa Author: Aaron Ma <aaron.ma@canonical.com> Date: Sat Sep 1 02:20:00 2018 +0800 vgaarb: Keep adding VGA device in queue If failed to find the deivice owning the boot framebuffer, try to use the first VGA device instead of the last one. Usually the 1st device is integrated GPU who owns the boot framebuffer. Signed-off-by: Aaron Ma <aaron.ma@canonical.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: 1535739600-8842-2-git-send-email-aaron.ma@canonical.com">https://patchwork.freedesktop.org/patch/msgid/1535739600-8842-2-git-send-email-aaron.ma@canonical.com :040000 040000 2d69570b87946ba42095609c945f04de9ad24ef7 3d86752f71500726f20d7d503128119f9b249175 M drivers ------ I undid these changes in the file 'drivers/gpu/vga/vgaarb.c' and created another test kernel today. Download: http://www.xenosoft.de/linux-image-5.2-alpha2-X1000_X5000.tar.gz You can undo the commit with the following patch: diff -rupN a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c --- a/drivers/gpu/vga/vgaarb.c 2019-05-09 07:56:27.595746473 +0200 +++ b/drivers/gpu/vga/vgaarb.c 2019-05-09 08:00:06.352660688 +0200 @@ -725,7 +725,7 @@ static bool vga_arbiter_add_pci_device(s vga_arbiter_check_bridge_sharing(vgadev); /* Add to the list */ - list_add_tail(&vgadev->list, &vga_list); + list_add(&vgadev->list, &vga_list); vga_count++; vgaarb_info(&pdev->dev, "VGA device added: decodes=%s,owns=%s,locks=%s\n", vga_iostate_to_str(vgadev->decodes), ------ @Allan (acefnq/ace) Please test it. Thanks, Christian
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