[SRU][B/OEM-B][PATCH 0/3] screen displays abnormally on the lenovo M715 with the AMD GPU (Radeon Vega 8 Mobile, rev ca, 1002:15dd)

[Hui Wang]

On 2018年10月09日 12:54, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1791569
Sorry it should be: BugLink: https://bugs.launchpad.net/bugs/1796786

Other parts are fine. please review them.
>
> These patches are in the 4.16-rcN already, no need to send them to cosmic.
>
> [Impact]
> On the machine of Lenovo M715, there is an AMD GPU (1022:15dd rev ca), when it
> switchs to amdgpufb, the screen displays abnormally, we tested with a couple monitors,
> all of them can reproduce this issue.
>
> [Fix]
> Backported 3 patches from mainline kernel, all of them focus on the change of
> disable_vga(). After applying these 3 patches, the issue disappears.
>
>
> [Test Case]
> boot the system, run glxgears, everything works well
>
> [Regression Potential]
> Very low, these patches come from upstream, and I have tested them on at least 6 different
> lenovo machines and those machines have different AMD GPUs on them, all of them worked
> as well as before.
>
>
>
> Bhawanpreet Lakha (1):
>    drm/amd/display: Fix takover from VGA mode
>
> Clark Zheng (1):
>    drm/amd/display: Refine disable VGA
>
> Eric Yang (1):
>    drm/amd/display: early return if not in vga mode in disable_vga
>
>   drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h     | 17 ++++++++++++++-
>   .../drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c  | 24 ++++++++++++++++++++++
>   2 files changed, 40 insertions(+), 1 deletion(-)
>