On Thu, 15 Aug 2019 16:37:05 +0200, Alex Deucher wrote:
On Thu, Aug 15, 2019 at 10:25 AM Karol Herbst kherbst@redhat.com wrote:
On Thu, Aug 15, 2019 at 4:20 PM Mario.Limonciello@dell.com wrote:
There are definitely going to be regressions on machines in the field with the in tree drivers by reverting this. I think we should have an answer for all of
those
before this revert is accepted.
Regarding systems with Intel+NVIDIA, we'll have to work with partners to
collect
some information on the impact of reverting this.
When this is used on a system with Intel+AMD the ASL configures AMD GPU to
use
"Hybrid Graphics" when on Windows and "Power Express" and "Switchable
Graphics"
when on Linux.
and what's exactly the difference between those? And what's the actual issue here?
DP/HDMI is not detected unless plugged in at bootup. It's due to missing HPD events.
afaik Lyude was working on fixing all that, at least for some drivers. If there is something wrong, we still should fix the drivers, not adding ACPI workarounds.
Alex: do you know if there are remaining issues regarding that with amdgpu?
There was an issue with hpd events not making it to the audio side when things were powered down that was fixed with this patch set: https://patchwork.freedesktop.org/patch/316793/ Those patches depended on a bunch of alsa changes as well which may have not been available in the distro used for a particular OEM program.
FYI, the corresponding commit for ALSA part is destined for 5.4 kernel: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=a...
BTW, Nouveau should suffer from the same problem. The patch to add the audio component support is found at: https://patchwork.freedesktop.org/patch/319131/
thanks,
Takashi