Kinky, have you tried a patch mentioned in my previous message? If yes, what are the results?
On Thu, Sep 12, 2019 at 2:31 PM Kinky Nekoboi <kinky_neko...@nekoboi.moe> wrote: > > Also user of said board. > > For me only Nvidia GPUs work correctly. > > But using an older Version from 2018, because S3 works there. > > > Am 10.09.19 um 11:05 schrieb Mike Banon: > > Indeed, this patch -- https://review.coreboot.org/c/coreboot/+/31448 ( > > src/device/pci: Add support for discrete VGA initialization and OpROM > > loading ) -- could help, because it will create the ACPI VFCT table > > for discrete RX 570 GPU instead of doing this for integrated HD 8670D. > > You could install it conveniently and securely with the help of > > csb_patcher.sh script ( > > http://dangerousprototypes.com/docs/Lenovo_G505S_hacking#NEWS or > > https://review.coreboot.org/c/coreboot/+/33509 ). > > > > Although there will not be a VFCT for your integrated GPU, it should > > be working fine even without it, maybe at cost of a slightly higher > > power consumption. We have discovered that > > > > " ACPI VFCT - it's a table where AMD stores the Radeon video BIOS when > > the system is booted up in UEFI mode." > > " Where the ACPI VFCT Table is missing, Power States may not work properly. > > " > > > > so it seems without VFCT the integrated GPU is going to be at its' max > > TDP even while not loaded. For example, knowing that a total TDP of > > our G505S laptop's A10-5750M APU (CPU+GPU) does not exceed 35W and > > looking at the values for similar APUs at this table > > https://www.eteknix.com/amd-kaveri-a10-7850k-overclocking-analysis/7/ > > (all values except Intel / RAM / OC), approximately for our A10-5750M > > it should be > > > > Idle | GPU load | CPU+GPU load > > 15.6W | 23.66W | 35W > > 44.5% | 67.6% | 100% > > > > We already knew that A10-5750M is 15W at idle, but have learned that > > GPU adds approximately 23.66W - 15.6W = about 8W while at its' max > > TDP. This G505S laptop comes with a 65W PSU, so with iGPU at it max > > TDP -- the laptop's battery life will be smaller in about 65/(65-8) = > > 1.12 times. However I've never compared the consumption difference of > > coreboot vs UEFI, would be nice if someone could test it in practice. > > > > Since this RX 570 discrete PCI-E card should have its' own flash chip > > for storing the AtomBIOS blob -- unlike our laptop's onboard discrete > > HD-8570M or R5-M230 -- I think in your case there should not be a need > > of storing the discrete GPU's AtomBIOS ROM at your coreboot BIOS in > > addition to the integrated one. However, if the advice above would not > > work, you could try extracting the discrete GPU's AtomBIOS , using > > either > > https://www.coreboot.org/VGA_support#How_to_retrieve_a_good_video_bios > > or https://github.com/g505s-opensource-researcher/g505s-atombios#description > > | https://mail.coreboot.org/pipermail/coreboot/2017-July/084660.html > > instruction. > > > > Best regards, > > Mike > > > > On Mon, Sep 9, 2019 at 10:04 PM awokd via coreboot > > <coreboot@coreboot.org> wrote: > >> Grzegorz Bogdał: > >>> Thank you. I'll check it out and report sometime in September whether the > >>> patches helped my case. > >> Please note, AFAIK they have only been tested on G505s's, so may need > >> some modification for your platform. > >> > >> _______________________________________________ > >> coreboot mailing list -- coreboot@coreboot.org > >> To unsubscribe send an email to coreboot-le...@coreboot.org > > _______________________________________________ > > coreboot mailing list -- coreboot@coreboot.org > > To unsubscribe send an email to coreboot-le...@coreboot.org > _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-le...@coreboot.org
